Eversource Energy (ES) 10-Q4 Nov 222022 Q3 Quarterly reportFinancial data

Company Profile

COVER PAGE

COVER PAGE - shares	9 Months Ended
COVER PAGE - shares	Sep. 30, 2022	Oct. 31, 2022
Document And Entity [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2022
Document Transition Report	false
Entity Registrant Name	EVERSOURCE ENERGY
Entity Incorporation, State or Country Code	MA
Entity Address, Address Line One	300 Cadwell Drive
Entity Address, City or Town	Springfield
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	01104
City Area Code	800
Local Phone Number	286-5000
Entity File Number	001-05324
Entity Tax Identification Number	04-2147929
Title of 12(b) Security	Common Shares, $5.00 par value per share
Trading Symbol	ES
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Smaller Reporting Company	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		348,307,416
Entity Central Index Key	0000072741
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q3
Amendment Flag	false
The Connecticut Light and Power Company
Document And Entity [Line Items]
Entity Registrant Name	THE CONNECTICUT LIGHT AND POWER COMPANY
Entity Incorporation, State or Country Code	CT
Entity Address, Address Line One	107 Selden Street
Entity Address, City or Town	Berlin
Entity Address, State or Province	CT
Entity Address, Postal Zip Code	06037-1616
City Area Code	800
Local Phone Number	286-5000
Entity File Number	000-00404
Entity Tax Identification Number	06-0303850
Entity Filer Category	Non-accelerated Filer
Entity Smaller Reporting Company	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		6,035,205
Entity Central Index Key	0000023426
Current Fiscal Year End Date	--12-31
NSTAR Electric Company
Document And Entity [Line Items]
Entity Registrant Name	NSTAR ELECTRIC COMPANY
Entity Incorporation, State or Country Code	MA
Entity Address, Address Line One	800 Boylston Street
Entity Address, City or Town	Boston
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02199
City Area Code	800
Local Phone Number	286-5000
Entity File Number	001-02301
Entity Tax Identification Number	04-1278810
Entity Filer Category	Non-accelerated Filer
Entity Smaller Reporting Company	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		200
Entity Central Index Key	0000013372
Current Fiscal Year End Date	--12-31
Public Service Company of New Hampshire
Document And Entity [Line Items]
Entity Registrant Name	PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE
Entity Incorporation, State or Country Code	NH
Entity Address, Address Line One	Energy Park
Entity Address, Address Line Two	780 North Commercial Street
Entity Address, City or Town	Manchester
Entity Address, State or Province	NH
Entity Address, Postal Zip Code	03101-1134
City Area Code	800
Local Phone Number	286-5000
Entity File Number	001-06392
Entity Tax Identification Number	02-0181050
Entity Filer Category	Non-accelerated Filer
Entity Smaller Reporting Company	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		301
Entity Central Index Key	0000315256
Current Fiscal Year End Date	--12-31

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Current Assets:
Cash	$ 45,716	$ 66,773
Cash Equivalents	440,000	0
Receivables, Net (net of allowance for uncollectible accounts)	1,453,785	1,226,069
Unbilled Revenues	181,176	210,879
Fuel, Materials, Supplies and REC Inventory	322,216	267,547
Regulatory Assets	1,143,646	1,129,093
Prepayments and Other Current Assets	333,115	369,759
Total Current Assets	3,919,654	3,270,120
Property, Plant and Equipment, Net	35,029,497	33,377,650
Deferred Debits and Other Assets:
Regulatory Assets	4,558,776	4,586,709
Goodwill	4,477,756	4,477,269
Investments in Unconsolidated Affiliates	2,053,404	1,436,293
Prepaid Pension and PBOP	561,012	271,987
Marketable Securities	377,183	460,347
Other Long-Term Assets	622,143	611,769
Total Deferred Debits and Other Assets	12,650,274	11,844,374
Total Assets	51,599,425	48,492,144
Current Liabilities:
Notes Payable	401,500	1,505,450
Long-Term Debt – Current Portion	1,610,468	1,193,097
Rate Reduction Bonds – Current Portion	43,210	43,210
Accounts Payable	1,459,606	1,672,230
Regulatory Liabilities	988,714	602,432
Other Current Liabilities	983,663	830,620
Total Current Liabilities	5,487,161	5,847,039
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	4,830,158	4,597,120
Regulatory Liabilities	3,901,106	3,866,251
Derivative Liabilities	164,253	235,387
Asset Retirement Obligations	505,937	500,111
Accrued Pension, SERP and PBOP	159,217	242,463
Other Long-Term Liabilities	874,391	971,080
Total Deferred Credits and Other Liabilities	10,435,062	10,412,412
Long-Term Debt	19,831,967	17,023,577
Rate Reduction Bonds	410,492	453,702
Noncontrolling Interest – Preferred Stock of Subsidiaries	155,570	155,570
Common Shareholders' Equity:
Common Shares	1,799,920	1,789,092
Capital Surplus, Paid In	8,327,477	8,098,514
Retained Earnings	5,429,076	5,005,391
Accumulated Other Comprehensive (Loss)/Income	(41,006)	(42,275)
Treasury Stock	(236,294)	(250,878)
Common Shareholders' Equity	15,279,173	14,599,844
Commitments and Contingencies (Note 9)
Total Liabilities and Capitalization	$ 51,599,425	$ 48,492,144

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Allowance for uncollectible accounts	$ 457,645	$ 417,406

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Statement [Abstract]
Operating Revenues	$ 3,215,645	$ 2,432,794	$ 9,259,596	$ 7,381,172
Operating Expenses:
Purchased Power, Fuel and Transmission	1,388,041	880,639	3,718,278	2,529,217
Operations and Maintenance	454,289	389,065	1,378,897	1,265,754
Depreciation	302,143	276,846	885,711	822,197
Amortization	111,287	45,236	418,644	158,860
Energy Efficiency Programs	162,545	143,796	498,708	460,814
Taxes Other Than Income Taxes	240,047	213,881	683,441	623,827
Total Operating Expenses	2,658,352	1,949,463	7,583,679	5,860,669
Operating Income/(Loss)	557,293	483,331	1,675,917	1,520,503
Interest Expense	178,174	147,962	491,509	431,162
Other Income, Net	89,831	43,768	255,253	124,588
Income Before Income Tax Expense	468,950	379,137	1,439,661	1,213,929
Income Tax Expense	117,661	94,091	349,305	294,461
Net Income	351,289	285,046	1,090,356	919,468
Net Income Attributable to Noncontrolling Interests	1,880	1,880	5,639	5,639
Net Income Attributable to Common Shareholders	$ 349,409	$ 283,166	$ 1,084,717	$ 913,829
Basic EPS (in dollars per share)	$ 1.01	$ 0.82	$ 3.13	$ 2.66
Diluted EPS (in dollars per share)	$ 1	$ 0.82	$ 3.13	$ 2.65
Weighted Average Common Shares Outstanding:
Basic (in shares)	347,297,411	344,023,846	346,115,823	343,848,905
Diluted (in shares)	347,762,693	344,669,782	346,573,101	344,480,056

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Net Income	$ 351,289	$ 285,046	$ 1,090,356	$ 919,468
Other Comprehensive Income, Net of Tax:
Qualified Cash Flow Hedging Instruments	5	115	15	967
Changes in Unrealized Losses on Marketable Securities	(667)	(106)	(1,990)	(569)
Changes in Funded Status of Pension, SERP and PBOP Benefit Plans	2,520	2,468	3,244	4,148
Net OCI	1,858	2,477	1,269	4,546
Comprehensive Income Attributable to Noncontrolling Interests	(1,880)	(1,880)	(5,639)	(5,639)
Comprehensive Income Attributable to Common Shareholders	$ 351,267	$ 285,643	$ 1,085,986	$ 918,375

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF COMMON SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Shares	Capital Surplus, Paid In	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock
Balance (in shares) at Dec. 31, 2020		342,954,023
Balance at Dec. 31, 2020	$ 14,063,566	$ 1,789,092	$ 8,015,663	$ 4,613,201	$ (76,411)	$ (277,979)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	368,023			368,023
Dividends on Common Stock	(206,913)			(206,913)
Dividends on Preferred Stock	(1,880)			(1,880)
Long-Term Incentive Plan Activity	(15,727)		(15,727)
Issuance of Treasury Shares (in shares)		480,275
Issuance of Treasury Shares	25,163		16,182			8,981
Other Comprehensive Income, Net of Tax	1,188				1,188
Balance (in shares) at Mar. 31, 2021		343,434,298
Balance at Mar. 31, 2021	14,233,420	$ 1,789,092	8,016,118	4,772,431	(75,223)	(268,998)
Balance (in shares) at Dec. 31, 2020		342,954,023
Balance at Dec. 31, 2020	14,063,566	$ 1,789,092	8,015,663	4,613,201	(76,411)	(277,979)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	919,468
Dividends on Preferred Stock	(5,600)
Other Comprehensive Income, Net of Tax	4,546
Balance (in shares) at Sep. 30, 2021		343,774,324
Balance at Sep. 30, 2021	14,411,611	$ 1,789,092	8,050,872	4,906,151	(71,865)	(262,639)
Balance (in shares) at Mar. 31, 2021		343,434,298
Balance at Mar. 31, 2021	14,233,420	$ 1,789,092	8,016,118	4,772,431	(75,223)	(268,998)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	266,400			266,400
Dividends on Common Stock	(206,893)			(206,893)
Dividends on Preferred Stock	(1,880)			(1,880)
Long-Term Incentive Plan Activity	6,162		6,162
Issuance of Treasury Shares (in shares)		166,805
Issuance of Treasury Shares	13,799		10,679			3,120
Other Comprehensive Income, Net of Tax	881				881
Balance (in shares) at Jun. 30, 2021		343,601,103
Balance at Jun. 30, 2021	14,311,889	$ 1,789,092	8,032,959	4,830,058	(74,342)	(265,878)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	285,046			285,046
Dividends on Common Stock	(207,073)			(207,073)
Dividends on Preferred Stock	(1,880)			(1,880)
Long-Term Incentive Plan Activity	6,478		6,478
Issuance of Treasury Shares (in shares)		173,221
Issuance of Treasury Shares	14,674		11,435			3,239
Other Comprehensive Income, Net of Tax	2,477				2,477
Balance (in shares) at Sep. 30, 2021		343,774,324
Balance at Sep. 30, 2021	$ 14,411,611	$ 1,789,092	8,050,872	4,906,151	(71,865)	(262,639)
Balance (in shares) at Dec. 31, 2021	344,403,196	344,403,196
Balance at Dec. 31, 2021	$ 14,599,844	$ 1,789,092	8,098,514	5,005,391	(42,275)	(250,878)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	445,326			445,326
Dividends on Common Stock	(219,768)			(219,768)
Dividends on Preferred Stock	(1,880)			(1,880)
Long-Term Incentive Plan Activity	(16,538)		(16,538)
Issuance of Treasury Shares (in shares)		447,076
Issuance of Treasury Shares	29,002		20,642			8,360
Other Comprehensive Income, Net of Tax	704				704
Balance (in shares) at Mar. 31, 2022		344,850,272
Balance at Mar. 31, 2022	$ 14,836,690	$ 1,789,092	8,102,618	5,229,069	(41,571)	(242,518)
Balance (in shares) at Dec. 31, 2021	344,403,196	344,403,196
Balance at Dec. 31, 2021	$ 14,599,844	$ 1,789,092	8,098,514	5,005,391	(42,275)	(250,878)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	1,090,356
Dividends on Preferred Stock	(5,600)
Other Comprehensive Income, Net of Tax	$ 1,269
Balance (in shares) at Sep. 30, 2022	347,348,749	347,348,749
Balance at Sep. 30, 2022	$ 15,279,173	$ 1,799,920	8,327,477	5,429,076	(41,006)	(236,294)
Balance (in shares) at Mar. 31, 2022		344,850,272
Balance at Mar. 31, 2022	14,836,690	$ 1,789,092	8,102,618	5,229,069	(41,571)	(242,518)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	293,742			293,742
Dividends on Common Stock	(219,877)			(219,877)
Dividends on Preferred Stock	(1,880)			(1,880)
Issuance of Common Shares (in shares)		1,392,804
Issuance of Common Shares	128,106	$ 6,964	121,142
Long-Term Incentive Plan Activity	9,070		9,070
Issuance of Treasury Shares (in shares)		167,953
Issuance of Treasury Shares	14,481		11,340			3,141
Capital Stock Expense	(1,824)		(1,824)
Other Comprehensive Income, Net of Tax	(1,293)				(1,293)
Balance (in shares) at Jun. 30, 2022		346,411,029
Balance at Jun. 30, 2022	$ 15,057,215	$ 1,796,056	8,242,346	5,301,054	(42,864)	(239,377)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Par value (in dollars per share)	$ 5
Net Income	$ 351,289			351,289
Dividends on Common Stock	(221,387)			(221,387)
Dividends on Preferred Stock	(1,880)			(1,880)
Issuance of Common Shares (in shares)		772,867
Issuance of Common Shares	71,799	$ 3,864	67,935
Long-Term Incentive Plan Activity	7,407		7,407
Issuance of Treasury Shares (in shares)		164,853
Issuance of Treasury Shares	13,845		10,762			3,083
Capital Stock Expense	(973)		(973)
Other Comprehensive Income, Net of Tax	$ 1,858				1,858
Balance (in shares) at Sep. 30, 2022	347,348,749	347,348,749
Balance at Sep. 30, 2022	$ 15,279,173	$ 1,799,920	$ 8,327,477	$ 5,429,076	$ (41,006)	$ (236,294)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Par value (in dollars per share)	$ 5

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF COMMON SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	3 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021
Statement of Stockholders' Equity [Abstract]
Dividends on Common Shares (in dollars per share)	$ 0.6375	$ 0.6375	$ 0.6375	$ 0.6025	$ 0.6025	$ 0.6025
Par value (in dollars per share)	$ 5	$ 5

CONDENSED CONSOLIDATED STATEM_5

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Operating Activities:
Net Income	$ 1,090,356	$ 919,468
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	885,711	822,197
Deferred Income Taxes	170,752	191,346
Uncollectible Expense	40,753	39,690
Pension, SERP and PBOP Income, Net	(120,416)	(10,882)
Pension and PBOP Contributions	(80,000)	(140,000)
Regulatory (Under)/Over Recoveries, Net	(32,193)	87,455
(Customer Credits)/Reserve at CL&P related to PURA Settlement Agreement and Storm Performance Penalty	(72,041)	103,583
Amortization	418,644	158,860
Cost of Removal Expenditures	(284,706)	(138,730)
Other	(113,148)	(91,148)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(294,383)	(158,205)
Taxes Receivable/Accrued, Net	160,260	44,003
Accounts Payable	11,821	(258,509)
Other Current Assets and Liabilities, Net	(92,506)	(48,855)
Net Cash Flows Provided by Operating Activities	1,688,904	1,520,273
Investing Activities:
Investments in Property, Plant and Equipment	(2,352,743)	(2,211,136)
Proceeds from Sales of Marketable Securities	340,660	334,619
Purchases of Marketable Securities	(313,714)	(313,961)
Investments in Unconsolidated Affiliates	(617,588)	(245,245)
Other Investing Activities	15,245	17,436
Net Cash Flows Used in Investing Activities	(2,928,140)	(2,418,287)
Financing Activities:
Issuance of Common Shares, Net of Issuance Costs	197,108	0
Cash Dividends on Common Shares	(643,634)	(603,611)
Cash Dividends on Preferred Stock	(5,639)	(5,639)
Decrease in Notes Payable	(1,103,950)	(458,325)
Repayment of Rate Reduction Bonds	(43,210)	(43,210)
Issuance of Long-Term Debt	4,045,000	3,150,000
Retirement of Long-Term Debt	(775,000)	(1,142,500)
Other Financing Activities	(50,191)	(45,522)
Net Cash Flows Provided by/(Used in) Financing Activities	1,620,484	851,193
Net Increase/(Decrease) in Cash, Cash Equivalents and Restricted Cash	381,248	(46,821)
Cash, Cash Equivalents and Restricted Cash - Beginning of Period	221,008	264,950
Cash, Cash Equivalents and Restricted Cash - End of Period	$ 602,256	$ 218,129

THE CONNECTICUT LIGHT AND POWER

THE CONNECTICUT LIGHT AND POWER COMPANY CONDENSED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Current Assets:
Cash	$ 45,716	$ 66,773
Receivables, Net (net of allowance for uncollectible accounts)	1,453,785	1,226,069
Unbilled Revenues	181,176	210,879
Fuel, Materials, Supplies and REC Inventory	322,216	267,547
Regulatory Assets	1,143,646	1,129,093
Prepayments and Other Current Assets	333,115	369,759
Total Current Assets	3,919,654	3,270,120
Property, Plant and Equipment, Net	35,029,497	33,377,650
Deferred Debits and Other Assets:
Total Long-Term Regulatory Assets	4,558,776	4,586,709
Other Long-Term Assets	622,143	611,769
Total Deferred Debits and Other Assets	12,650,274	11,844,374
Total Assets	51,599,425	48,492,144
Current Liabilities:
Long-Term Debt – Current Portion	1,610,468	1,193,097
Accounts Payable	1,459,606	1,672,230
Regulatory Liabilities	988,714	602,432
Other Current Liabilities	983,663	830,620
Total Current Liabilities	5,487,161	5,847,039
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	4,830,158	4,597,120
Regulatory Liabilities	3,901,106	3,866,251
Derivative Liabilities	164,253	235,387
Other Long-Term Liabilities	874,391	971,080
Total Deferred Credits and Other Liabilities	10,435,062	10,412,412
Long-Term Debt	19,831,967	17,023,577
Noncontrolling Interest – Preferred Stock of Subsidiaries	155,570	155,570
Common Shareholders' Equity:
Capital Surplus, Paid In	8,327,477	8,098,514
Retained Earnings	5,429,076	5,005,391
Accumulated Other Comprehensive Income	(41,006)	(42,275)
Common Shareholders' Equity	15,279,173	14,599,844
Commitments and Contingencies (Note 9)
Total Liabilities and Capitalization	51,599,425	48,492,144
The Connecticut Light and Power Company
Current Assets:
Cash	14,289	55,804
Receivables, Net (net of allowance for uncollectible accounts)	645,489	447,774
Accounts Receivable from Affiliated Companies	76,512	43,944
Unbilled Revenues	49,511	56,787
Fuel, Materials, Supplies and REC Inventory	81,631	60,264
Regulatory Assets	305,556	371,609
Prepaid Property Taxes	79,067	24,261
Prepayments and Other Current Assets	37,667	95,996
Total Current Assets	1,289,722	1,156,439
Property, Plant and Equipment, Net	11,226,672	10,803,543
Deferred Debits and Other Assets:
Total Long-Term Regulatory Assets	1,632,875	1,713,161
Other Long-Term Assets	310,267	276,513
Total Deferred Debits and Other Assets	1,943,142	1,989,674
Total Assets	14,459,536	13,949,656
Current Liabilities:
Notes Payable to Eversource Parent	26,000	0
Long-Term Debt – Current Portion	400,000	0
Accounts Payable	439,249	533,454
Accounts Payable to Affiliated Companies	95,708	132,578
Regulatory Liabilities	434,465	266,489
Derivative Liabilities	78,564	73,528
Other Current Liabilities	209,253	141,955
Total Current Liabilities	1,683,239	1,148,004
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	1,562,256	1,562,102
Regulatory Liabilities	1,243,581	1,193,259
Derivative Liabilities	164,253	235,387
Other Long-Term Liabilities	175,733	179,824
Total Deferred Credits and Other Liabilities	3,145,823	3,170,572
Long-Term Debt	3,816,229	4,215,379
Noncontrolling Interest – Preferred Stock of Subsidiaries	116,200	116,200
Common Shareholders' Equity:
Common Shares	60,352	60,352
Capital Surplus, Paid In	3,210,765	3,010,765
Retained Earnings	2,426,765	2,228,133
Accumulated Other Comprehensive Income	163	251
Common Shareholders' Equity	5,698,045	5,299,501
Commitments and Contingencies (Note 9)
Total Liabilities and Capitalization	$ 14,459,536	$ 13,949,656

THE CONNECTICUT LIGHT AND POW_2

THE CONNECTICUT LIGHT AND POWER COMPANY CONDENSED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Allowance for uncollectible accounts	$ 457,645	$ 417,406
The Connecticut Light and Power Company
Allowance for uncollectible accounts	$ 198,599	$ 181,319

THE CONNECTICUT LIGHT AND POW_3

THE CONNECTICUT LIGHT AND POWER COMPANY CONDENSED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Operating Revenues	$ 3,215,645	$ 2,432,794	$ 9,259,596	$ 7,381,172
Operating Expenses:
Purchased Power, Fuel and Transmission	1,388,041	880,639	3,718,278	2,529,217
Operations and Maintenance	454,289	389,065	1,378,897	1,265,754
Depreciation	302,143	276,846	885,711	822,197
Energy Efficiency Programs	162,545	143,796	498,708	460,814
Taxes Other Than Income Taxes	240,047	213,881	683,441	623,827
Total Operating Expenses	2,658,352	1,949,463	7,583,679	5,860,669
Operating Income/(Loss)	557,293	483,331	1,675,917	1,520,503
Interest Expense	178,174	147,962	491,509	431,162
Other Income, Net	89,831	43,768	255,253	124,588
Income Before Income Tax Expense	468,950	379,137	1,439,661	1,213,929
Income Tax Expense	117,661	94,091	349,305	294,461
Net Income	351,289	285,046	1,090,356	919,468
The Connecticut Light and Power Company
Operating Revenues	1,369,101	919,643	3,690,614	2,736,513
Operating Expenses:
Purchased Power, Fuel and Transmission	641,052	392,301	1,585,515	1,073,712
Operations and Maintenance	189,864	137,816	515,928	465,630
Depreciation	89,468	85,304	264,966	253,132
Amortization of Regulatory Assets, Net	105,825	28,921	318,347	76,637
Energy Efficiency Programs	37,934	35,714	103,111	100,810
Taxes Other Than Income Taxes	104,298	99,901	290,449	275,178
Total Operating Expenses	1,168,441	779,957	3,078,316	2,245,099
Operating Income/(Loss)	200,660	139,686	612,298	491,414
Interest Expense	42,391	42,778	125,152	124,371
Other Income, Net	21,927	6,903	61,290	21,690
Income Before Income Tax Expense	180,196	103,811	548,436	388,733
Income Tax Expense	36,909	33,658	126,334	104,626
Net Income	$ 143,287	$ 70,153	$ 422,102	$ 284,107

THE CONNECTICUT LIGHT AND POW_4

THE CONNECTICUT LIGHT AND POWER COMPANY CONDENSED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Net Income	$ 351,289	$ 285,046	$ 1,090,356	$ 919,468
Other Comprehensive Income, Net of Tax:
Qualified Cash Flow Hedging Instruments	5	115	15	967
Changes in Unrealized Losses on Marketable Securities	(667)	(106)	(1,990)	(569)
Net OCI	1,858	2,477	1,269	4,546
Comprehensive Income Attributable to Common Shareholders	351,267	285,643	1,085,986	918,375
The Connecticut Light and Power Company
Net Income	143,287	70,153	422,102	284,107
Other Comprehensive Income, Net of Tax:
Qualified Cash Flow Hedging Instruments	(7)	(7)	(20)	(20)
Changes in Unrealized Losses on Marketable Securities	(23)	(2)	(68)	(18)
Net OCI	(30)	(9)	(88)	(38)
Comprehensive Income Attributable to Common Shareholders	$ 143,257	$ 70,144	$ 422,014	$ 284,069

THE CONNECTICUT LIGHT AND POW_5

THE CONNECTICUT LIGHT AND POWER COMPANY CONDENSED STATEMENTS OF COMMON STOCKHOLDER'S EQUITY - USD ($) $ in Thousands	Total	Common Stock	Capital Surplus, Paid In	Retained Earnings	Accumulated Other Comprehensive Loss	The Connecticut Light and Power Company	The Connecticut Light and Power Company Common Stock	The Connecticut Light and Power Company Capital Surplus, Paid In	The Connecticut Light and Power Company Retained Earnings	The Connecticut Light and Power Company Accumulated Other Comprehensive Loss
Balance (in shares) at Dec. 31, 2020		342,954,023					6,035,205
Balance at Dec. 31, 2020	$ 14,063,566	$ 1,789,092	$ 8,015,663	$ 4,613,201	$ (76,411)	$ 5,044,786	$ 60,352	$ 2,810,765	$ 2,173,367	$ 302
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	368,023			368,023		98,398			98,398
Dividends on Preferred Stock	(1,880)			(1,880)		(1,390)			(1,390)
Dividends on Common Stock	(206,913)			(206,913)		(70,100)			(70,100)
Other Comprehensive Income, Net of Tax	1,188				1,188	(32)				(32)
Balance (in shares) at Mar. 31, 2021		343,434,298					6,035,205
Balance at Mar. 31, 2021	14,233,420	$ 1,789,092	8,016,118	4,772,431	(75,223)	5,071,662	$ 60,352	2,810,765	2,200,275	270
Balance (in shares) at Dec. 31, 2020		342,954,023					6,035,205
Balance at Dec. 31, 2020	14,063,566	$ 1,789,092	8,015,663	4,613,201	(76,411)	5,044,786	$ 60,352	2,810,765	2,173,367	302
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	919,468					284,107
Dividends on Preferred Stock	(5,600)
Other Comprehensive Income, Net of Tax	4,546					(38)
Balance (in shares) at Sep. 30, 2021		343,774,324					6,035,205
Balance at Sep. 30, 2021	14,411,611	$ 1,789,092	8,050,872	4,906,151	(71,865)	5,114,385	$ 60,352	2,810,765	2,243,004	264
Balance (in shares) at Mar. 31, 2021		343,434,298					6,035,205
Balance at Mar. 31, 2021	14,233,420	$ 1,789,092	8,016,118	4,772,431	(75,223)	5,071,662	$ 60,352	2,810,765	2,200,275	270
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	266,400			266,400		115,556			115,556
Dividends on Preferred Stock	(1,880)			(1,880)		(1,390)			(1,390)
Dividends on Common Stock	(206,893)			(206,893)		(70,100)			(70,100)
Other Comprehensive Income, Net of Tax	881				881	3				3
Balance (in shares) at Jun. 30, 2021		343,601,103					6,035,205
Balance at Jun. 30, 2021	14,311,889	$ 1,789,092	8,032,959	4,830,058	(74,342)	5,115,731	$ 60,352	2,810,765	2,244,341	273
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	285,046			285,046		70,153			70,153
Dividends on Preferred Stock	(1,880)			(1,880)		(1,390)			(1,390)
Dividends on Common Stock	(207,073)			(207,073)		(70,100)			(70,100)
Other Comprehensive Income, Net of Tax	2,477				2,477	(9)				(9)
Balance (in shares) at Sep. 30, 2021		343,774,324					6,035,205
Balance at Sep. 30, 2021	$ 14,411,611	$ 1,789,092	8,050,872	4,906,151	(71,865)	5,114,385	$ 60,352	2,810,765	2,243,004	264
Balance (in shares) at Dec. 31, 2021	344,403,196	344,403,196					6,035,205
Balance at Dec. 31, 2021	$ 14,599,844	$ 1,789,092	8,098,514	5,005,391	(42,275)	5,299,501	$ 60,352	3,010,765	2,228,133	251
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	445,326			445,326		152,977			152,977
Dividends on Preferred Stock	(1,880)			(1,880)		(1,390)			(1,390)
Dividends on Common Stock	(219,768)			(219,768)		(73,100)			(73,100)
Capital Contributions from Eversource Parent						100,000		100,000
Other Comprehensive Income, Net of Tax	704				704	(35)				(35)
Balance (in shares) at Mar. 31, 2022		344,850,272					6,035,205
Balance at Mar. 31, 2022	$ 14,836,690	$ 1,789,092	8,102,618	5,229,069	(41,571)	5,477,953	$ 60,352	3,110,765	2,306,620	216
Balance (in shares) at Dec. 31, 2021	344,403,196	344,403,196					6,035,205
Balance at Dec. 31, 2021	$ 14,599,844	$ 1,789,092	8,098,514	5,005,391	(42,275)	5,299,501	$ 60,352	3,010,765	2,228,133	251
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	1,090,356					422,102
Dividends on Preferred Stock	(5,600)
Other Comprehensive Income, Net of Tax	$ 1,269					(88)
Balance (in shares) at Sep. 30, 2022	347,348,749	347,348,749					6,035,205
Balance at Sep. 30, 2022	$ 15,279,173	$ 1,799,920	8,327,477	5,429,076	(41,006)	5,698,045	$ 60,352	3,210,765	2,426,765	163
Balance (in shares) at Mar. 31, 2022		344,850,272					6,035,205
Balance at Mar. 31, 2022	14,836,690	$ 1,789,092	8,102,618	5,229,069	(41,571)	5,477,953	$ 60,352	3,110,765	2,306,620	216
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	293,742			293,742		125,838			125,838
Dividends on Preferred Stock	(1,880)			(1,880)		(1,390)			(1,390)
Dividends on Common Stock	(219,877)			(219,877)		(73,100)			(73,100)
Capital Contributions from Eversource Parent						100,000		100,000
Other Comprehensive Income, Net of Tax	(1,293)				(1,293)	(23)				(23)
Balance (in shares) at Jun. 30, 2022		346,411,029					6,035,205
Balance at Jun. 30, 2022	15,057,215	$ 1,796,056	8,242,346	5,301,054	(42,864)	5,629,278	$ 60,352	3,210,765	2,357,968	193
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	351,289			351,289		143,287			143,287
Dividends on Preferred Stock	(1,880)			(1,880)		(1,390)			(1,390)
Dividends on Common Stock	(221,387)			(221,387)		(73,100)			(73,100)
Other Comprehensive Income, Net of Tax	$ 1,858				1,858	(30)				(30)
Balance (in shares) at Sep. 30, 2022	347,348,749	347,348,749					6,035,205
Balance at Sep. 30, 2022	$ 15,279,173	$ 1,799,920	$ 8,327,477	$ 5,429,076	$ (41,006)	$ 5,698,045	$ 60,352	$ 3,210,765	$ 2,426,765	$ 163

THE CONNECTICUT LIGHT AND POW_6

THE CONNECTICUT LIGHT AND POWER COMPANY CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Operating Activities:
Net Income	$ 1,090,356	$ 919,468
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	885,711	822,197
Deferred Income Taxes	170,752	191,346
Uncollectible Expense	40,753	39,690
Pension, SERP and PBOP (Income)/Expense, Net	(120,416)	(10,882)
Pension and PBOP Contributions	(80,000)	(140,000)
Regulatory (Under)/Over Recoveries, Net	(32,193)	87,455
(Customer Credits)/Reserve at CL&P related to PURA Settlement Agreement and Storm Performance Penalty	(72,041)	103,583
Cost of Removal Expenditures	(284,706)	(138,730)
Other	(113,148)	(91,148)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(294,383)	(158,205)
Taxes Receivable/Accrued, Net	160,260	44,003
Accounts Payable	11,821	(258,509)
Other Current Assets and Liabilities, Net	(92,506)	(48,855)
Net Cash Flows Provided by Operating Activities	1,688,904	1,520,273
Investing Activities:
Investments in Property, Plant and Equipment	(2,352,743)	(2,211,136)
Other Investing Activities	15,245	17,436
Net Cash Flows Used in Investing Activities	(2,928,140)	(2,418,287)
Financing Activities:
Cash Dividends on Common Shares	(643,634)	(603,611)
Cash Dividends on Preferred Stock	(5,639)	(5,639)
Issuance of Long-Term Debt	4,045,000	3,150,000
Retirement of Long-Term Debt	(775,000)	(1,142,500)
Other Financing Activities	(50,191)	(45,522)
Net Cash Flows Provided by/(Used in) Financing Activities	1,620,484	851,193
Net Increase/(Decrease) in Cash, Cash Equivalents and Restricted Cash	381,248	(46,821)
Cash, Cash Equivalents and Restricted Cash - Beginning of Period	221,008	264,950
Cash, Cash Equivalents and Restricted Cash - End of Period	602,256	218,129
The Connecticut Light and Power Company
Operating Activities:
Net Income	422,102	284,107
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	264,966	253,132
Deferred Income Taxes	(18,780)	77,147
Uncollectible Expense	10,816	10,183
Pension, SERP and PBOP (Income)/Expense, Net	(21,751)	4,478
Pension and PBOP Contributions	0	(78,913)
Regulatory (Under)/Over Recoveries, Net	(47,620)	(19,404)
(Customer Credits)/Reserve at CL&P related to PURA Settlement Agreement and Storm Performance Penalty	(72,041)	103,583
Amortization of Regulatory Assets, Net	318,347	76,637
Cost of Removal Expenditures	(54,145)	(54,264)
Other	(19,310)	(19,915)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(271,658)	(165,423)
Taxes Receivable/Accrued, Net	106,737	45,762
Accounts Payable	273	(54,226)
Other Current Assets and Liabilities, Net	(63,682)	(12,315)
Net Cash Flows Provided by Operating Activities	554,254	450,569
Investing Activities:
Investments in Property, Plant and Equipment	(608,966)	(563,234)
Other Investing Activities	513	251
Net Cash Flows Used in Investing Activities	(608,453)	(562,983)
Financing Activities:
Cash Dividends on Common Shares	(219,300)	(210,300)
Cash Dividends on Preferred Stock	(4,169)	(4,169)
Capital Contributions from Eversource Parent	200,000	0
Issuance of Long-Term Debt	0	425,000
Retirement of Long-Term Debt	0	(120,500)
Increase in Notes Payable to Eversource Parent	26,000	0
Other Financing Activities	0	(5,664)
Net Cash Flows Provided by/(Used in) Financing Activities	2,531	84,367
Net Increase/(Decrease) in Cash, Cash Equivalents and Restricted Cash	(51,668)	(28,047)
Cash, Cash Equivalents and Restricted Cash - Beginning of Period	74,788	99,809
Cash, Cash Equivalents and Restricted Cash - End of Period	$ 23,120	$ 71,762

NSTAR ELECTRIC COMPANY AND SUBS

NSTAR ELECTRIC COMPANY AND SUBSIDIARY CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Current Assets:
Cash	$ 45,716	$ 66,773
Cash Equivalents	440,000	0
Receivables, Net (net of allowance for uncollectible accounts)	1,453,785	1,226,069
Unbilled Revenues	181,176	210,879
Fuel, Materials, Supplies and REC Inventory	322,216	267,547
Regulatory Assets	1,143,646	1,129,093
Prepayments and Other Current Assets	333,115	369,759
Total Current Assets	3,919,654	3,270,120
Property, Plant and Equipment, Net	35,029,497	33,377,650
Deferred Debits and Other Assets:
Total Long-Term Regulatory Assets	4,558,776	4,586,709
Prepaid Pension and PBOP	561,012	271,987
Other Long-Term Assets	622,143	611,769
Total Deferred Debits and Other Assets	12,650,274	11,844,374
Total Assets	51,599,425	48,492,144
Current Liabilities:
Notes Payable	401,500	1,505,450
Long-Term Debt – Current Portion	1,610,468	1,193,097
Accounts Payable	1,459,606	1,672,230
Regulatory Liabilities	988,714	602,432
Other Current Liabilities	983,663	830,620
Total Current Liabilities	5,487,161	5,847,039
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	4,830,158	4,597,120
Regulatory Liabilities	3,901,106	3,866,251
Other Long-Term Liabilities	874,391	971,080
Total Deferred Credits and Other Liabilities	10,435,062	10,412,412
Long-Term Debt	19,831,967	17,023,577
Preferred Stock Not Subject to Mandatory Redemption	155,570	155,570
Common Shareholders' Equity:
Capital Surplus, Paid In	8,327,477	8,098,514
Retained Earnings	5,429,076	5,005,391
Accumulated Other Comprehensive Income	(41,006)	(42,275)
Common Shareholders' Equity	15,279,173	14,599,844
Commitments and Contingencies (Note 9)
Total Liabilities and Capitalization	51,599,425	48,492,144
NSTAR Electric Company
Current Assets:
Cash	13,581	745
Cash Equivalents	440,000	0
Receivables, Net (net of allowance for uncollectible accounts)	477,700	405,674
Accounts Receivable from Affiliated Companies	51,600	67,420
Unbilled Revenues	46,312	37,497
Fuel, Materials, Supplies and REC Inventory	90,456	116,712
Taxes Receivable	0	80,617
Regulatory Assets	387,333	443,956
Prepayments and Other Current Assets	25,898	22,397
Total Current Assets	1,532,880	1,175,018
Property, Plant and Equipment, Net	11,365,172	10,876,614
Deferred Debits and Other Assets:
Total Long-Term Regulatory Assets	1,257,884	1,135,231
Prepaid Pension and PBOP	519,059	441,426
Other Long-Term Assets	186,936	171,657
Total Deferred Debits and Other Assets	1,963,879	1,748,314
Total Assets	14,861,931	13,799,946
Current Liabilities:
Notes Payable	0	162,500
Notes Payable to Eversource Parent	2,800	0
Long-Term Debt – Current Portion	400,000	400,000
Accounts Payable	399,669	490,915
Accounts Payable to Affiliated Companies	97,940	129,575
Obligations to Third Party Suppliers	168,845	116,273
Renewable Portfolio Standards Compliance Obligations	83,616	100,200
Regulatory Liabilities	368,044	228,248
Other Current Liabilities	132,919	84,303
Total Current Liabilities	1,653,833	1,712,014
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	1,647,513	1,579,508
Regulatory Liabilities	1,595,754	1,559,072
Other Long-Term Liabilities	291,093	347,934
Total Deferred Credits and Other Liabilities	3,534,360	3,486,514
Long-Term Debt	4,424,765	3,585,399
Preferred Stock Not Subject to Mandatory Redemption	43,000	43,000
Common Shareholders' Equity:
Common Shares	0	0
Capital Surplus, Paid In	2,303,942	2,253,942
Retained Earnings	2,901,666	2,718,576
Accumulated Other Comprehensive Income	365	501
Common Shareholders' Equity	5,205,973	4,973,019
Commitments and Contingencies (Note 9)
Total Liabilities and Capitalization	$ 14,861,931	$ 13,799,946

NSTAR ELECTRIC COMPANY AND SU_2

NSTAR ELECTRIC COMPANY AND SUBSIDIARY CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Allowance for uncollectible accounts	$ 457,645	$ 417,406
NSTAR Electric
Allowance for uncollectible accounts	$ 99,533	$ 97,005

NSTAR ELECTRIC COMPANY AND SU_3

NSTAR ELECTRIC COMPANY AND SUBSIDIARY CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Operating Revenues	$ 3,215,645	$ 2,432,794	$ 9,259,596	$ 7,381,172
Operating Expenses:
Purchased Power, Fuel and Transmission	1,388,041	880,639	3,718,278	2,529,217
Operations and Maintenance	454,289	389,065	1,378,897	1,265,754
Depreciation	302,143	276,846	885,711	822,197
Energy Efficiency Programs	162,545	143,796	498,708	460,814
Taxes Other Than Income Taxes	240,047	213,881	683,441	623,827
Total Operating Expenses	2,658,352	1,949,463	7,583,679	5,860,669
Operating Income/(Loss)	557,293	483,331	1,675,917	1,520,503
Interest Expense	178,174	147,962	491,509	431,162
Other Income, Net	89,831	43,768	255,253	124,588
Income Before Income Tax Expense	468,950	379,137	1,439,661	1,213,929
Income Tax Expense	117,661	94,091	349,305	294,461
Net Income	351,289	285,046	1,090,356	919,468
NSTAR Electric Company
Operating Revenues	1,105,452	918,698	2,752,278	2,343,116
Operating Expenses:
Purchased Power, Fuel and Transmission	421,217	294,052	971,754	711,667
Operations and Maintenance	161,770	142,074	475,727	421,649
Depreciation	91,194	84,820	269,928	251,530
Amortization of Regulatory Assets, Net	15,940	8,073	65,307	23,963
Energy Efficiency Programs	105,708	86,699	255,230	226,071
Taxes Other Than Income Taxes	65,085	54,723	185,748	163,501
Total Operating Expenses	860,914	670,441	2,223,694	1,798,381
Operating Income/(Loss)	244,538	248,257	528,584	544,735
Interest Expense	41,829	37,329	119,035	106,829
Other Income, Net	37,895	20,215	101,385	58,941
Income Before Income Tax Expense	240,604	231,143	510,934	496,847
Income Tax Expense	52,520	53,692	110,674	114,560
Net Income	$ 188,084	$ 177,451	$ 400,260	$ 382,287

NSTAR ELECTRIC COMPANY AND SU_4

NSTAR ELECTRIC COMPANY AND SUBSIDIARY CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Net Income	$ 351,289	$ 285,046	$ 1,090,356	$ 919,468
Other Comprehensive Income, Net of Tax:
Changes in Funded Status of Pension, SERP and PBOP Benefit Plans	2,520	2,468	3,244	4,148
Qualified Cash Flow Hedging Instruments	5	115	15	967
Changes in Unrealized Losses on Marketable Securities	(667)	(106)	(1,990)	(569)
Net OCI	1,858	2,477	1,269	4,546
Comprehensive Income Attributable to Common Shareholders	351,267	285,643	1,085,986	918,375
NSTAR Electric Company
Net Income	188,084	177,451	400,260	382,287
Other Comprehensive Income, Net of Tax:
Changes in Funded Status of Pension, SERP and PBOP Benefit Plans	(61)	(40)	(132)	(122)
Qualified Cash Flow Hedging Instruments	5	5	15	293
Changes in Unrealized Losses on Marketable Securities	(6)	(1)	(19)	(5)
Net OCI	(62)	(36)	(136)	166
Comprehensive Income Attributable to Common Shareholders	$ 188,022	$ 177,415	$ 400,124	$ 382,453

NSTAR ELECTRIC COMPANY AND SU_5

NSTAR ELECTRIC COMPANY AND SUBSIDIARY CONDENSED CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDER'S EQUITY - USD ($) $ in Thousands	Total	Common Stock	Capital Surplus, Paid In	Retained Earnings	Accumulated Other Comprehensive Loss	NSTAR Electric	NSTAR Electric Common Stock	NSTAR Electric Capital Surplus, Paid In	NSTAR Electric Retained Earnings	NSTAR Electric Accumulated Other Comprehensive Loss
Balance (in shares) at Dec. 31, 2020		342,954,023					200
Balance at Dec. 31, 2020	$ 14,063,566	$ 1,789,092	$ 8,015,663	$ 4,613,201	$ (76,411)	$ 4,521,418	$ 0	$ 1,993,942	$ 2,527,167	$ 309
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	368,023			368,023		93,924			93,924
Dividends on Preferred Stock	(1,880)			(1,880)		(490)			(490)
Dividends on Common Stock	(206,913)			(206,913)		(206,400)			(206,400)
Other Comprehensive Loss	1,188				1,188	61				61
Balance (in shares) at Mar. 31, 2021		343,434,298					200
Balance at Mar. 31, 2021	14,233,420	$ 1,789,092	8,016,118	4,772,431	(75,223)	4,408,513	$ 0	1,993,942	2,414,201	370
Balance (in shares) at Dec. 31, 2020		342,954,023					200
Balance at Dec. 31, 2020	14,063,566	$ 1,789,092	8,015,663	4,613,201	(76,411)	4,521,418	$ 0	1,993,942	2,527,167	309
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	919,468					382,287
Dividends on Preferred Stock	(5,600)
Other Comprehensive Loss	4,546					166
Balance (in shares) at Sep. 30, 2021		343,774,324					200
Balance at Sep. 30, 2021	14,411,611	$ 1,789,092	8,050,872	4,906,151	(71,865)	4,679,201	$ 0	2,053,942	2,624,784	475
Balance (in shares) at Mar. 31, 2021		343,434,298					200
Balance at Mar. 31, 2021	14,233,420	$ 1,789,092	8,016,118	4,772,431	(75,223)	4,408,513	$ 0	1,993,942	2,414,201	370
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	266,400			266,400		110,912			110,912
Dividends on Preferred Stock	(1,880)			(1,880)		(490)			(490)
Dividends on Common Stock	(206,893)			(206,893)		(76,800)			(76,800)
Capital Contributions from Eversource Parent						60,000		60,000
Other Comprehensive Loss	881				881	141				141
Balance (in shares) at Jun. 30, 2021		343,601,103					200
Balance at Jun. 30, 2021	14,311,889	$ 1,789,092	8,032,959	4,830,058	(74,342)	4,502,276	$ 0	2,053,942	2,447,823	511
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	285,046			285,046		177,451			177,451
Dividends on Preferred Stock	(1,880)			(1,880)		(490)			(490)
Dividends on Common Stock	(207,073)			(207,073)
Other Comprehensive Loss	2,477				2,477	(36)				(36)
Balance (in shares) at Sep. 30, 2021		343,774,324					200
Balance at Sep. 30, 2021	$ 14,411,611	$ 1,789,092	8,050,872	4,906,151	(71,865)	4,679,201	$ 0	2,053,942	2,624,784	475
Balance (in shares) at Dec. 31, 2021	344,403,196	344,403,196					200
Balance at Dec. 31, 2021	$ 14,599,844	$ 1,789,092	8,098,514	5,005,391	(42,275)	4,973,019	$ 0	2,253,942	2,718,576	501
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	445,326			445,326		92,739			92,739
Dividends on Preferred Stock	(1,880)			(1,880)		(490)			(490)
Dividends on Common Stock	(219,768)			(219,768)		(71,900)			(71,900)
Other Comprehensive Loss	704				704	(47)				(47)
Balance (in shares) at Mar. 31, 2022		344,850,272					200
Balance at Mar. 31, 2022	$ 14,836,690	$ 1,789,092	8,102,618	5,229,069	(41,571)	4,993,321	$ 0	2,253,942	2,738,925	454
Balance (in shares) at Dec. 31, 2021	344,403,196	344,403,196					200
Balance at Dec. 31, 2021	$ 14,599,844	$ 1,789,092	8,098,514	5,005,391	(42,275)	4,973,019	$ 0	2,253,942	2,718,576	501
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	1,090,356					400,260
Dividends on Preferred Stock	(5,600)
Other Comprehensive Loss	$ 1,269					(136)
Balance (in shares) at Sep. 30, 2022	347,348,749	347,348,749					200
Balance at Sep. 30, 2022	$ 15,279,173	$ 1,799,920	8,327,477	5,429,076	(41,006)	5,205,973	$ 0	2,303,942	2,901,666	365
Balance (in shares) at Mar. 31, 2022		344,850,272					200
Balance at Mar. 31, 2022	14,836,690	$ 1,789,092	8,102,618	5,229,069	(41,571)	4,993,321	$ 0	2,253,942	2,738,925	454
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	293,742			293,742		119,437			119,437
Dividends on Preferred Stock	(1,880)			(1,880)		(490)			(490)
Dividends on Common Stock	(219,877)			(219,877)		(71,900)			(71,900)
Capital Contributions from Eversource Parent						50,000		50,000
Other Comprehensive Loss	(1,293)				(1,293)	(27)				(27)
Balance (in shares) at Jun. 30, 2022		346,411,029					200
Balance at Jun. 30, 2022	15,057,215	$ 1,796,056	8,242,346	5,301,054	(42,864)	5,090,341	$ 0	2,303,942	2,785,972	427
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	351,289			351,289		188,084			188,084
Dividends on Preferred Stock	(1,880)			(1,880)		(490)			(490)
Dividends on Common Stock	(221,387)			(221,387)		(71,900)			(71,900)
Other Comprehensive Loss	$ 1,858				1,858	(62)				(62)
Balance (in shares) at Sep. 30, 2022	347,348,749	347,348,749					200
Balance at Sep. 30, 2022	$ 15,279,173	$ 1,799,920	$ 8,327,477	$ 5,429,076	$ (41,006)	$ 5,205,973	$ 0	$ 2,303,942	$ 2,901,666	$ 365

NSTAR ELECTRIC COMPANY AND SU_6

NSTAR ELECTRIC COMPANY AND SUBSIDIARY CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Operating Activities:
Net Income	$ 1,090,356	$ 919,468
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	885,711	822,197
Deferred Income Taxes	170,752	191,346
Uncollectible Expense	40,753	39,690
Pension, SERP and PBOP Income, Net	(120,416)	(10,882)
Pension and PBOP Contributions	(80,000)	(140,000)
Regulatory (Under)/Over Recoveries, Net	(32,193)	87,455
Cost of Removal Expenditures	(284,706)	(138,730)
Other	(113,148)	(91,148)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(294,383)	(158,205)
Taxes Receivable/Accrued, Net	160,260	44,003
Accounts Payable	11,821	(258,509)
Other Current Assets and Liabilities, Net	(92,506)	(48,855)
Net Cash Flows Provided by Operating Activities	1,688,904	1,520,273
Investing Activities:
Investments in Property, Plant and Equipment	(2,352,743)	(2,211,136)
Other Investing Activities	15,245	17,436
Net Cash Flows Used in Investing Activities	(2,928,140)	(2,418,287)
Financing Activities:
Cash Dividends on Common Shares	(643,634)	(603,611)
Cash Dividends on Preferred Stock	(5,639)	(5,639)
Issuance of Long-Term Debt	4,045,000	3,150,000
Retirement of Long-Term Debt	(775,000)	(1,142,500)
Decrease in Notes Payable	(1,103,950)	(458,325)
Other Financing Activities	(50,191)	(45,522)
Net Cash Flows Provided by/(Used in) Financing Activities	1,620,484	851,193
Net Increase/(Decrease) in Cash, Cash Equivalents and Restricted Cash	381,248	(46,821)
Cash, Cash Equivalents and Restricted Cash - Beginning of Period	221,008	264,950
Cash, Cash Equivalents and Restricted Cash - End of Period	602,256	218,129
NSTAR Electric
Operating Activities:
Net Income	400,260	382,287
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	269,928	251,530
Deferred Income Taxes	34,025	12,905
Uncollectible Expense	12,159	12,477
Pension, SERP and PBOP Income, Net	(41,790)	(19,627)
Pension and PBOP Contributions	(15,000)	(10,000)
Regulatory (Under)/Over Recoveries, Net	(36,203)	86,111
Amortization of Regulatory Assets, Net	65,307	23,963
Cost of Removal Expenditures	(33,467)	(36,521)
Payment of Withheld Property Taxes	(76,084)	0
Other	(8,961)	(34,484)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(67,950)	(110,336)
Taxes Receivable/Accrued, Net	122,467	109,561
Accounts Payable	(55,676)	(85,431)
Other Current Assets and Liabilities, Net	65,609	34,905
Net Cash Flows Provided by Operating Activities	634,624	617,340
Investing Activities:
Investments in Property, Plant and Equipment	(691,940)	(675,245)
Other Investing Activities	143	70
Net Cash Flows Used in Investing Activities	(691,797)	(675,175)
Financing Activities:
Cash Dividends on Common Shares	(215,700)	(283,200)
Cash Dividends on Preferred Stock	(1,470)	(1,470)
Issuance of Long-Term Debt	850,000	600,000
Retirement of Long-Term Debt	0	(250,000)
Capital Contributions from Eversource Parent	50,000	60,000
Increase in Notes Payable to Eversource Parent	2,800	3,300
Decrease in Notes Payable	(162,500)	(57,000)
Other Financing Activities	(13,191)	(10,367)
Net Cash Flows Provided by/(Used in) Financing Activities	509,939	61,263
Net Increase/(Decrease) in Cash, Cash Equivalents and Restricted Cash	452,766	3,428
Cash, Cash Equivalents and Restricted Cash - Beginning of Period	18,179	17,410
Cash, Cash Equivalents and Restricted Cash - End of Period	$ 470,945	$ 20,838

PUBLIC SERVICE COMPANY OF NEW H

PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE AND SUBSIDIARIES CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Current Assets:
Cash	$ 45,716	$ 66,773
Receivables, Net (net of allowance for uncollectible accounts)	1,453,785	1,226,069
Unbilled Revenues	181,176	210,879
Fuel, Materials, Supplies and REC Inventory	322,216	267,547
Regulatory Assets	1,143,646	1,129,093
Prepayments and Other Current Assets	333,115	369,759
Total Current Assets	3,919,654	3,270,120
Property, Plant and Equipment, Net	35,029,497	33,377,650
Deferred Debits and Other Assets:
Total Long-Term Regulatory Assets	4,558,776	4,586,709
Other Long-Term Assets	622,143	611,769
Total Deferred Debits and Other Assets	12,650,274	11,844,374
Total Assets	51,599,425	48,492,144
Current Liabilities:
Rate Reduction Bonds – Current Portion	43,210	43,210
Accounts Payable	1,459,606	1,672,230
Regulatory Liabilities	988,714	602,432
Other Current Liabilities	983,663	830,620
Total Current Liabilities	5,487,161	5,847,039
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	4,830,158	4,597,120
Regulatory Liabilities	3,901,106	3,866,251
Other Long-Term Liabilities	874,391	971,080
Total Deferred Credits and Other Liabilities	10,435,062	10,412,412
Long-Term Debt	19,831,967	17,023,577
Rate Reduction Bonds	410,492	453,702
Common Shareholders' Equity:
Capital Surplus, Paid In	8,327,477	8,098,514
Retained Earnings	5,429,076	5,005,391
Accumulated Other Comprehensive (Loss)/Income	(41,006)	(42,275)
Common Shareholders' Equity	15,279,173	14,599,844
Commitments and Contingencies (Note 9)
Total Liabilities and Capitalization	51,599,425	48,492,144
PSNH
Current Assets:
Cash	2,171	15
Receivables, Net (net of allowance for uncollectible accounts)	180,790	124,232
Accounts Receivable from Affiliated Companies	14,418	17,156
Unbilled Revenues	59,715	53,937
Fuel, Materials, Supplies and REC Inventory	38,041	25,930
Regulatory Assets	110,111	107,169
Special Deposits	18,721	31,390
Prepayments and Other Current Assets	3,789	22,109
Total Current Assets	427,756	381,938
Property, Plant and Equipment, Net	3,917,559	3,656,462
Deferred Debits and Other Assets:
Total Long-Term Regulatory Assets	618,720	679,182
Other Long-Term Assets	25,651	23,202
Total Deferred Debits and Other Assets	644,371	702,384
Total Assets	4,989,686	4,740,784
Current Liabilities:
Notes Payable to Eversource Parent	139,700	110,600
Rate Reduction Bonds – Current Portion	43,210	43,210
Accounts Payable	162,643	166,452
Accounts Payable to Affiliated Companies	27,032	43,485
Regulatory Liabilities	185,092	120,176
Other Current Liabilities	69,801	63,005
Total Current Liabilities	627,478	546,928
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	534,875	537,978
Regulatory Liabilities	381,294	381,366
Other Long-Term Liabilities	42,453	64,264
Total Deferred Credits and Other Liabilities	958,622	983,608
Long-Term Debt	1,164,427	1,163,833
Rate Reduction Bonds	410,492	453,702
Common Shareholders' Equity:
Common Shares	0	0
Capital Surplus, Paid In	1,268,134	1,088,134
Retained Earnings	560,627	504,556
Accumulated Other Comprehensive (Loss)/Income	(94)	23
Common Shareholders' Equity	1,828,667	1,592,713
Commitments and Contingencies (Note 9)
Total Liabilities and Capitalization	$ 4,989,686	$ 4,740,784

PUBLIC SERVICE COMPANY OF NEW_2

PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE AND SUBSIDIARIES CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Allowance for uncollectible accounts	$ 457,645	$ 417,406
PSNH
Allowance for uncollectible accounts	$ 28,820	$ 24,331

PUBLIC SERVICE COMPANY OF NEW_3

PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE AND SUBSIDIARIES CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Operating Revenues	$ 3,215,645	$ 2,432,794	$ 9,259,596	$ 7,381,172
Operating Expenses:
Purchased Power, Fuel and Transmission	1,388,041	880,639	3,718,278	2,529,217
Operations and Maintenance	454,289	389,065	1,378,897	1,265,754
Depreciation	302,143	276,846	885,711	822,197
Energy Efficiency Programs	162,545	143,796	498,708	460,814
Taxes Other Than Income Taxes	240,047	213,881	683,441	623,827
Total Operating Expenses	2,658,352	1,949,463	7,583,679	5,860,669
Operating Income/(Loss)	557,293	483,331	1,675,917	1,520,503
Interest Expense	178,174	147,962	491,509	431,162
Other Income, Net	89,831	43,768	255,253	124,588
Income Before Income Tax Expense	468,950	379,137	1,439,661	1,213,929
Income Tax Expense	117,661	94,091	349,305	294,461
Net Income	351,289	285,046	1,090,356	919,468
PSNH
Operating Revenues	430,642	314,893	1,077,124	887,177
Operating Expenses:
Purchased Power, Fuel and Transmission	215,360	107,353	452,007	279,475
Operations and Maintenance	67,811	57,041	194,114	168,242
Depreciation	32,187	30,169	94,997	89,462
Amortization of Regulatory Assets, Net	7,398	17,922	43,449	62,744
Energy Efficiency Programs	11,142	10,762	28,678	30,475
Taxes Other Than Income Taxes	25,331	24,038	73,377	69,639
Total Operating Expenses	359,229	247,285	886,622	700,037
Operating Income/(Loss)	71,413	67,608	190,502	187,140
Interest Expense	15,030	14,321	43,432	42,774
Other Income, Net	8,073	3,171	23,365	11,598
Income Before Income Tax Expense	64,456	56,458	170,435	155,964
Income Tax Expense	13,009	12,315	36,364	32,512
Net Income	$ 51,447	$ 44,143	$ 134,071	$ 123,452

PUBLIC SERVICE COMPANY OF NEW_4

PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE AND SUBSIDIARIES CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Net Income	$ 351,289	$ 285,046	$ 1,090,356	$ 919,468
Other Comprehensive Income, Net of Tax:
Qualified Cash Flow Hedging Instruments	5	115	15	967
Changes in Unrealized Losses on Marketable Securities	(667)	(106)	(1,990)	(569)
Net OCI	1,858	2,477	1,269	4,546
Comprehensive Income Attributable to Common Shareholders	351,267	285,643	1,085,986	918,375
PSNH
Net Income	51,447	44,143	134,071	123,452
Other Comprehensive Income, Net of Tax:
Qualified Cash Flow Hedging Instruments	0	109	0	673
Changes in Unrealized Losses on Marketable Securities	(39)	(6)	(117)	(33)
Net OCI	(39)	103	(117)	640
Comprehensive Income Attributable to Common Shareholders	$ 51,408	$ 44,246	$ 133,954	$ 124,092

PUBLIC SERVICE COMPANY OF NEW_5

PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE AND SUBSIDIARIES CONDENSED CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDER'S EQUITY - USD ($) $ in Thousands	Total	Common Stock	Capital Surplus, Paid In	Retained Earnings	Accumulated Other Comprehensive Income/(Loss)	PSNH	PSNH Common Stock	PSNH Capital Surplus, Paid In	PSNH Retained Earnings	PSNH Accumulated Other Comprehensive Income/(Loss)
Balance (in shares) at Dec. 31, 2020		342,954,023					301
Balance at Dec. 31, 2020	$ 14,063,566	$ 1,789,092	$ 8,015,663	$ 4,613,201	$ (76,411)	$ 1,542,539	$ 0	$ 928,134	$ 615,018	$ (613)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	368,023			368,023		44,676			44,676
Dividends on Common Stock	(206,913)			(206,913)		(25,200)			(25,200)
Other Comprehensive Income, Net of Tax	1,188				1,188	255				255
Balance (in shares) at Mar. 31, 2021		343,434,298					301
Balance at Mar. 31, 2021	14,233,420	$ 1,789,092	8,016,118	4,772,431	(75,223)	1,562,270	$ 0	928,134	634,494	(358)
Balance (in shares) at Dec. 31, 2020		342,954,023					301
Balance at Dec. 31, 2020	14,063,566	$ 1,789,092	8,015,663	4,613,201	(76,411)	1,542,539	$ 0	928,134	615,018	(613)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	919,468					123,452
Other Comprehensive Income, Net of Tax	4,546					640
Balance (in shares) at Sep. 30, 2021		343,774,324					301
Balance at Sep. 30, 2021	14,411,611	$ 1,789,092	8,050,872	4,906,151	(71,865)	1,591,031	$ 0	1,088,134	502,870	27
Balance (in shares) at Mar. 31, 2021		343,434,298					301
Balance at Mar. 31, 2021	14,233,420	$ 1,789,092	8,016,118	4,772,431	(75,223)	1,562,270	$ 0	928,134	634,494	(358)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	266,400			266,400		34,633			34,633
Dividends on Common Stock	(206,893)			(206,893)		(185,200)			(185,200)
Capital Contributions from Eversource Parent						160,000		160,000
Other Comprehensive Income, Net of Tax	881				881	282				282
Balance (in shares) at Jun. 30, 2021		343,601,103					301
Balance at Jun. 30, 2021	14,311,889	$ 1,789,092	8,032,959	4,830,058	(74,342)	1,571,985	$ 0	1,088,134	483,927	(76)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	285,046			285,046		44,143			44,143
Dividends on Common Stock	(207,073)			(207,073)		(25,200)			(25,200)
Other Comprehensive Income, Net of Tax	2,477				2,477	103				103
Balance (in shares) at Sep. 30, 2021		343,774,324					301
Balance at Sep. 30, 2021	$ 14,411,611	$ 1,789,092	8,050,872	4,906,151	(71,865)	1,591,031	$ 0	1,088,134	502,870	27
Balance (in shares) at Dec. 31, 2021	344,403,196	344,403,196					301
Balance at Dec. 31, 2021	$ 14,599,844	$ 1,789,092	8,098,514	5,005,391	(42,275)	1,592,713	$ 0	1,088,134	504,556	23
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	445,326			445,326		45,586			45,586
Dividends on Common Stock	(219,768)			(219,768)		(26,000)			(26,000)
Other Comprehensive Income, Net of Tax	704				704	(48)				(48)
Balance (in shares) at Mar. 31, 2022		344,850,272					301
Balance at Mar. 31, 2022	$ 14,836,690	$ 1,789,092	8,102,618	5,229,069	(41,571)	1,612,251	$ 0	1,088,134	524,142	(25)
Balance (in shares) at Dec. 31, 2021	344,403,196	344,403,196					301
Balance at Dec. 31, 2021	$ 14,599,844	$ 1,789,092	8,098,514	5,005,391	(42,275)	1,592,713	$ 0	1,088,134	504,556	23
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	1,090,356					134,071
Other Comprehensive Income, Net of Tax	$ 1,269					(117)
Balance (in shares) at Sep. 30, 2022	347,348,749	347,348,749					301
Balance at Sep. 30, 2022	$ 15,279,173	$ 1,799,920	8,327,477	5,429,076	(41,006)	1,828,667	$ 0	1,268,134	560,627	(94)
Balance (in shares) at Mar. 31, 2022		344,850,272					301
Balance at Mar. 31, 2022	14,836,690	$ 1,789,092	8,102,618	5,229,069	(41,571)	1,612,251	$ 0	1,088,134	524,142	(25)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	293,742			293,742		37,038			37,038
Dividends on Common Stock	(219,877)			(219,877)		(26,000)			(26,000)
Capital Contributions from Eversource Parent						180,000		180,000
Other Comprehensive Income, Net of Tax	(1,293)				(1,293)	(30)				(30)
Balance (in shares) at Jun. 30, 2022		346,411,029					301
Balance at Jun. 30, 2022	15,057,215	$ 1,796,056	8,242,346	5,301,054	(42,864)	1,803,259	$ 0	1,268,134	535,180	(55)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	351,289			351,289		51,447			51,447
Dividends on Common Stock	(221,387)			(221,387)		(26,000)			(26,000)
Other Comprehensive Income, Net of Tax	$ 1,858				1,858	(39)				(39)
Balance (in shares) at Sep. 30, 2022	347,348,749	347,348,749					301
Balance at Sep. 30, 2022	$ 15,279,173	$ 1,799,920	$ 8,327,477	$ 5,429,076	$ (41,006)	$ 1,828,667	$ 0	$ 1,268,134	$ 560,627	$ (94)

PUBLIC SERVICE COMPANY OF NEW_6

PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE AND SUBSIDIARIES CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Operating Activities:
Net Income	$ 1,090,356	$ 919,468
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	885,711	822,197
Deferred Income Taxes	170,752	191,346
Uncollectible Expense	40,753	39,690
Pension, SERP and PBOP Income, Net	(120,416)	(10,882)
Regulatory Over/(Underrecoveries), Net	(32,193)	87,455
Cost of Removal Expenditures	(284,706)	(138,730)
Other	(113,148)	(91,148)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(294,383)	(158,205)
Taxes Receivable/Accrued, Net	160,260	44,003
Accounts Payable	11,821	(258,509)
Other Current Assets and Liabilities, Net	(92,506)	(48,855)
Net Cash Flows Provided by Operating Activities	1,688,904	1,520,273
Investing Activities:
Investments in Property, Plant and Equipment	(2,352,743)	(2,211,136)
Other Investing Activities	15,245	17,436
Net Cash Flows Used in Investing Activities	(2,928,140)	(2,418,287)
Financing Activities:
Cash Dividends on Common Shares	(643,634)	(603,611)
Issuance of Long-Term Debt	4,045,000	3,150,000
Retirement of Long-Term Debt	(775,000)	(1,142,500)
Repayment of Rate Reduction Bonds	(43,210)	(43,210)
Other Financing Activities	(50,191)	(45,522)
Net Cash Flows Provided by/(Used in) Financing Activities	1,620,484	851,193
Net Increase/(Decrease) in Cash, Cash Equivalents and Restricted Cash	381,248	(46,821)
Cash, Cash Equivalents and Restricted Cash - Beginning of Period	221,008	264,950
Cash, Cash Equivalents and Restricted Cash - End of Period	602,256	218,129
PSNH
Operating Activities:
Net Income	134,071	123,452
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	94,997	89,462
Deferred Income Taxes	(12,212)	(13,385)
Uncollectible Expense	8,060	4,381
Pension, SERP and PBOP Income, Net	(12,269)	(2,664)
Regulatory Over/(Underrecoveries), Net	63,423	29,029
Amortization of Regulatory Assets, Net	43,449	62,744
Cost of Removal Expenditures	(25,682)	(19,988)
Other	10,317	(2,750)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(66,751)	(25,607)
Taxes Receivable/Accrued, Net	20,986	22,286
Accounts Payable	(3,969)	(42,654)
Other Current Assets and Liabilities, Net	(7,681)	12,866
Net Cash Flows Provided by Operating Activities	246,739	237,172
Investing Activities:
Investments in Property, Plant and Equipment	(346,318)	(217,414)
Other Investing Activities	879	431
Net Cash Flows Used in Investing Activities	(345,439)	(216,983)
Financing Activities:
Cash Dividends on Common Shares	(78,000)	(235,600)
Capital Contributions from Eversource Parent	180,000	160,000
Issuance of Long-Term Debt	0	350,000
Retirement of Long-Term Debt	0	(282,000)
Repayment of Rate Reduction Bonds	(43,210)	(43,210)
Increase in Notes Payable to Eversource Parent	29,100	20,200
Other Financing Activities	(70)	(2,961)
Net Cash Flows Provided by/(Used in) Financing Activities	87,820	(33,571)
Net Increase/(Decrease) in Cash, Cash Equivalents and Restricted Cash	(10,880)	(13,382)
Cash, Cash Equivalents and Restricted Cash - Beginning of Period	35,126	39,555
Cash, Cash Equivalents and Restricted Cash - End of Period	$ 24,246	$ 26,173

SUMMARY OF SIGNIFICANT ACCOUNTI

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	9 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	Sep. 30, 2022
Accounting Policies [Abstract]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES A. Basis of Presentation Eversource Energy is a public utility holding company primarily engaged, through its wholly-owned regulated utility subsidiaries, in the energy delivery business. Eversource Energy's wholly-owned regulated utility subsidiaries consist of CL&P, NSTAR Electric and PSNH (electric utilities), Yankee Gas, NSTAR Gas and EGMA (natural gas utilities), and Aquarion (water utilities). Eversource provides energy delivery and/or water service to approximately 4.4 million electric, natural gas and water customers through twelve regulated utilities in Connecticut, Massachusetts and New Hampshire. The unaudited condensed consolidated financial statements of Eversource, NSTAR Electric and PSNH include the accounts of each of their respective subsidiaries. Intercompany transactions have been eliminated in consolidation. The accompanying unaudited condensed consolidated financial statements of Eversource, NSTAR Electric and PSNH and the unaudited condensed financial statements of CL&P are herein collectively referred to as the "financial statements." The combined notes to the financial statements have been prepared pursuant to the rules and regulations of the SEC. Certain information and footnote disclosures included in annual financial statements prepared in accordance with GAAP have been omitted pursuant to such rules and regulations. The accompanying financial statements should be read in conjunction with the Combined Notes to Financial Statements included in Item 8, "Financial Statements and Supplementary Data," of the Eversource 2021 Form 10-K, which was filed with the SEC on February 17, 2022. The preparation of the financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent liabilities as of the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. The financial statements contain, in the opinion of management, all adjustments (including normal, recurring adjustments) necessary to present fairly Eversource's, CL&P's, NSTAR Electric's and PSNH's financial position as of September 30, 2022 and December 31, 2021, and the results of operations, comprehensive income and common shareholders' equity for the three and nine months ended September 30, 2022 and 2021 and the cash flows for the nine months ended September 30, 2022 and 2021. The results of operations and comprehensive income for the three and nine months ended September 30, 2022 and 2021 and the cash flows for the nine months ended September 30, 2022 and 2021 are not necessarily indicative of the results expected for a full year. CYAPC and YAEC are inactive regional nuclear power companies engaged in the long-term storage of their spent nuclear fuel. Eversource consolidates the operations of CYAPC and YAEC because CL&P's, NSTAR Electric's and PSNH's combined ownership and voting interests in each of these entities is greater than 50 percent. Intercompany transactions between CL&P, NSTAR Electric, PSNH and the CYAPC and YAEC companies have been eliminated in consolidation of the Eversource financial statements. Eversource holds several equity ownership interests that are not consolidated and are accounted for under the equity method. Eversource's utility subsidiaries' electric, natural gas and water distribution and transmission businesses are subject to rate-regulation that is based on cost recovery and meets the criteria for application of accounting guidance for entities with rate-regulated operations, which considers the effect of regulation on the differences in the timing of the recognition of certain revenues and expenses from those of other businesses and industries. See Note 2, "Regulatory Accounting," for further information. Certain reclassifications of prior period data were made in the accompanying financial statements to conform to the current period presentation. B. Allowance for Uncollectible Accounts Receivables, Net on the balance sheets primarily includes trade receivables from retail customers and customers related to wholesale transmission contracts, wholesale market sales, sales of RECs, and property rentals. Receivables, Net also includes customer receivables for the purchase of electricity from a competitive third party supplier, the current portion of customer energy efficiency loans, property damage receivables and other miscellaneous receivables. There is no material concentration of receivables. Receivables are recorded at amortized cost, net of a credit loss provision (or allowance for uncollectible accounts). Receivables are presented net of expected credit losses at estimated net realizable value by maintaining an allowance for uncollectible accounts. The current expected credit loss (CECL) model is applied to receivables for purposes of calculating the allowance for uncollectible accounts. This model is based on expected losses and results in the recognition of estimated expected credit losses, including uncollectible amounts for both billed and unbilled revenues, over the life of the receivable at the time a receivable is recorded. The allowance for uncollectible accounts is determined based upon a variety of judgments and factors, including an aging-based quantitative assessment that applies an estimated uncollectible percentage to each receivable aging category. Factors in determining credit loss include historical collection, write-off experience, analysis of delinquency statistics, and management's assessment of collectability from customers, including current conditions, customer payment trends, the impact on customer bills because of energy usage trends and changes in rates, flexible payment plans and financial hardship arrearage management programs being offered to customers, reasonable forecasts, and expectations of future collectability and collection efforts. Management continuously assesses the collectability of receivables and adjusts estimates based on actual experience and future expectations based on economic conditions, collection efforts and other factors. Management also monitors the aging analysis of receivables to determine if there are changes in the collections of accounts receivable. Receivable balances are written off against the allowance for uncollectible accounts when the customer accounts are no longer in service and these balances are deemed to be uncollectible. Management concluded that the reserve balance as of September 30, 2022 adequately reflected the collection risk and net realizable value for its receivables. As of September 30, 2022 and December 31, 2021, the total amount incurred as a result of COVID-19 included in the allowance for uncollectible accounts was $55.5 million and $55.3 million at Eversource, $19.7 million and $23.9 million at CL&P, and $4.1 million and $9.0 million at NSTAR Electric, respectively. At our Connecticut and Massachusetts utilities, the COVID-19 related uncollectible amounts were deferred either as incremental regulatory costs or deferred through existing regulatory tracking mechanisms that recover uncollectible energy supply costs, as management believes it is probable that these costs will ultimately be recovered from customers in future rates. No COVID-19 related uncollectible amounts were deferred at PSNH as a result of a July 2021 NHPUC order. Based on the status of our COVID-19 regulatory dockets, policies and practices in the jurisdictions in which we operate, we believe the state regulatory commissions in Connecticut and Massachusetts will allow us to recover our incremental uncollectible customer receivable costs associated with COVID-19. The PURA allows CL&P and Yankee Gas to accelerate the recovery of accounts receivable balances attributable to qualified customers under financial or medical duress (uncollectible hardship accounts receivable) outstanding for greater than 180 days and 90 days, respectively. The DPU allows NSTAR Electric, NSTAR Gas and EGMA to recover in rates amounts associated with certain uncollectible hardship accounts receivable. These uncollectible hardship customer account balances are included in Regulatory Assets or Other Long-Term Assets on the balance sheets. Hardship customers are protected from shut-off in certain circumstances, and historical collection experience has reflected a higher default risk as compared to the rest of the receivable population. Management uses a higher credit risk profile for this pool of trade receivables as compared to non-hardship receivables. The allowance for uncollectible hardship accounts is included in the total uncollectible allowance balance. The total allowance for uncollectible accounts is included in Receivables, Net on the balance sheets. The activity in the allowance for uncollectible accounts by portfolio segment as of September 30 th is as follows: Eversource CL&P NSTAR Electric PSNH (Millions of Dollars) Hardship Accounts Retail (Non-Hardship), Total Allowance Hardship Accounts Retail (Non-Hardship), Total Allowance Hardship Accounts Retail (Non-Hardship), Total Allowance Total Allowance Three Months Ended 2022 Beginning Balance $ 242.7 $ 215.1 $ 457.8 $ 152.1 $ 40.6 $ 192.7 $ 45.0 $ 55.5 $ 100.5 $ 27.3 Uncollectible Expense — 10.7 10.7 — 4.1 4.1 — 3.5 3.5 3.5 Uncollectible Costs Deferred (1) 15.6 9.4 25.0 11.3 2.0 13.3 2.8 4.0 6.8 0.1 Write-Offs (6.5) (33.2) (39.7) (5.0) (7.7) (12.7) (0.3) (12.3) (12.6) (2.3) Recoveries Collected 0.3 3.5 3.8 0.2 1.0 1.2 — 1.3 1.3 0.2 Ending Balance $ 252.1 $ 205.5 $ 457.6 $ 158.6 $ 40.0 $ 198.6 $ 47.5 $ 52.0 $ 99.5 $ 28.8 Nine Months Ended 2022 Beginning Balance $ 226.1 $ 191.3 $ 417.4 $ 144.6 $ 36.7 $ 181.3 $ 43.3 $ 53.7 $ 97.0 $ 24.3 Uncollectible Expense — 40.8 40.8 — 10.8 10.8 — 12.2 12.2 8.1 Uncollectible Costs Deferred (1) 38.0 36.7 74.7 22.3 2.0 24.3 4.9 11.8 16.7 1.2 Write-Offs (13.5) (76.3) (89.8) (9.4) (14.4) (23.8) (0.7) (30.6) (31.3) (5.4) Recoveries Collected 1.5 13.0 14.5 1.1 4.9 6.0 — 4.9 4.9 0.6 Ending Balance $ 252.1 $ 205.5 $ 457.6 $ 158.6 $ 40.0 $ 198.6 $ 47.5 $ 52.0 $ 99.5 $ 28.8 Eversource CL&P NSTAR Electric PSNH (Millions of Dollars) Hardship Accounts Retail (Non-Hardship), Total Allowance Hardship Accounts Retail (Non-Hardship), Total Allowance Hardship Accounts Retail (Non-Hardship), Total Allowance Total Allowance Three Months Ended 2021 Beginning Balance $ 210.7 $ 215.1 $ 425.8 $ 145.6 $ 43.2 $ 188.8 $ 35.9 $ 62.1 $ 98.0 $ 17.2 Uncollectible Expense — 12.0 12.0 — 3.6 3.6 — 5.1 5.1 1.2 Uncollectible Costs Deferred (1) 22.8 1.7 24.5 4.5 5.7 10.2 11.8 (3.5) 8.3 1.2 Write-Offs (3.9) (20.5) (24.4) (3.5) (5.4) (8.9) (0.1) (7.4) (7.5) (2.8) Recoveries Collected 0.3 3.5 3.8 0.2 1.6 1.8 — 1.1 1.1 0.2 Ending Balance $ 229.9 $ 211.8 $ 441.7 $ 146.8 $ 48.7 $ 195.5 $ 47.6 $ 57.4 $ 105.0 $ 17.0 Nine Months Ended 2021 Beginning Balance $ 194.8 $ 164.1 $ 358.9 $ 129.1 $ 28.3 $ 157.4 $ 39.7 $ 51.9 $ 91.6 $ 17.2 Uncollectible Expense — 39.7 39.7 — 10.2 10.2 — 12.5 12.5 4.4 Uncollectible Costs Deferred (1) 44.8 53.3 98.1 25.7 21.4 47.1 8.3 11.8 20.1 2.0 Write-Offs (10.6) (55.2) (65.8) (8.7) (14.8) (23.5) (0.4) (22.6) (23.0) (7.3) Recoveries Collected 0.9 9.9 10.8 0.7 3.6 4.3 — 3.8 3.8 0.7 Ending Balance $ 229.9 $ 211.8 $ 441.7 $ 146.8 $ 48.7 $ 195.5 $ 47.6 $ 57.4 $ 105.0 $ 17.0 (1) These expected credit losses are deferred as regulatory costs on the balance sheets, as these amounts are ultimately recovered in rates. Amounts include uncollectible costs for hardship accounts and other customer receivables, including uncollectible amounts related to uncollectible energy supply costs and COVID-19. C. Fair Value Measurements Fair value measurement guidance is applied to derivative contracts that are not elected or designated as "normal purchases" or "normal sales" (normal) and to the marketable securities held in trusts. Fair value measurement guidance is also applied to valuations of the investments used to calculate the funded status of pension and PBOP plans, the nonrecurring fair value measurements of nonfinancial assets such as goodwill, long-lived assets, equity method investments, AROs, and in the valuation of acquisitions. The fair value measurement guidance was also applied in estimating the fair value of preferred stock, long-term debt and RRBs. Fair Value Hierarchy: In measuring fair value, Eversource uses observable market data when available in order to minimize the use of unobservable inputs. Inputs used in fair value measurements are categorized into three fair value hierarchy levels for disclosure purposes. The entire fair value measurement is categorized based on the lowest level of input that is significant to the fair value measurement. Eversource evaluates the classification of assets and liabilities measured at fair value on a quarterly basis. The levels of the fair value hierarchy are described below: Level 1 - Inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities as of the reporting date. Active markets are those in which transactions for the asset or liability occur in sufficient frequency and volume to provide pricing information on an ongoing basis. Level 2 - Inputs are quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-derived valuations in which all significant inputs are observable. Level 3 - Quoted market prices are not available. Fair value is derived from valuation techniques in which one or more significant inputs or assumptions are unobservable. Where possible, valuation techniques incorporate observable market inputs that can be validated to external sources such as industry exchanges, including prices of energy and energy-related products. Uncategorized - Investments that are measured at net asset value are not categorized within the fair value hierarchy. Determination of Fair Value: The valuation techniques and inputs used in Eversource's fair value measurements are described in Note 4, "Derivative Instruments," Note 5, "Marketable Securities," and Note 10, "Fair Value of Financial Instruments," to the financial statements. D. Other Income, Net The components of Other Income, Net on the statements of income were as follows: For the Three Months Ended September 30, 2022 September 30, 2021 (Millions of Dollars) Eversource CL&P NSTAR Electric PSNH Eversource CL&P NSTAR Electric PSNH Pension, SERP and PBOP Non-Service $ 55.3 $ 16.2 $ 21.6 $ 6.8 $ 21.7 $ 4.2 $ 10.1 $ 2.5 AFUDC Equity 12.6 3.7 6.5 0.7 10.3 1.7 6.2 0.3 Equity in Earnings of Unconsolidated Affiliates 3.8 — 0.1 — 4.9 — 0.1 — Investment Income/(Loss) 1.3 0.2 0.4 0.2 (0.6) (0.3) (0.2) (0.1) Interest Income 14.1 1.8 9.2 0.4 7.3 1.3 3.9 0.4 Gain on Sale of Property 2.5 — — — — — — — Other 0.2 — 0.1 — 0.2 — 0.1 0.1 Total Other Income, Net $ 89.8 $ 21.9 $ 37.9 $ 8.1 $ 43.8 $ 6.9 $ 20.2 $ 3.2 For the Nine Months Ended September 30, 2022 September 30, 2021 (Millions of Dollars) Eversource CL&P NSTAR Electric PSNH Eversource CL&P NSTAR Electric PSNH Pension, SERP and PBOP Non-Service $ 164.5 $ 48.3 $ 64.0 $ 20.1 $ 63.9 $ 11.2 $ 30.3 $ 7.9 AFUDC Equity 33.7 9.3 17.5 1.7 28.7 5.1 18.6 1.2 Equity in Earnings of Unconsolidated Affiliates (1) 20.8 — 0.2 — 13.3 — 0.3 — Investment Income/(Loss) 2.4 (0.9) 0.6 0.5 0.7 1.2 0.6 0.3 Interest Income 30.3 4.6 18.8 1.1 17.2 4.1 8.8 2.0 Gain on Sale of Property 2.7 — — — 0.1 — — 0.1 Other 0.9 — 0.3 — 0.7 0.1 0.3 0.1 Total Other Income, Net $ 255.3 $ 61.3 $ 101.4 $ 23.4 $ 124.6 $ 21.7 $ 58.9 $ 11.6 (1) Equity in earnings of unconsolidated affiliates includes $12.2 million and $2.1 million of pre-tax unrealized gains associated with an investment in a renewable energy fund for the nine months ended September 30, 2022 and 2021, respectively. E. Investments in Unconsolidated Affiliates Investments in entities that are not consolidated are included in long-term assets on the balance sheets and earnings impacts from these equity investments are included in Other Income, Net on the statements of income. Eversource's investments included the following: (Millions of Dollars) Ownership Interest As of September 30, 2022 As of December 31, 2021 Offshore Wind Business - North East Offshore 50 % $ 1,823.5 $ 1,213.6 Natural Gas Pipeline - Algonquin Gas Transmission, LLC 15 % 119.6 121.9 Renewable Energy Investment Fund 90 % 84.5 76.5 Other various 25.8 24.3 Total Investments in Unconsolidated Affiliates $ 2,053.4 $ 1,436.3 Offshore Wind Business: Eversource’s offshore wind business includes a 50 percent ownership interest in North East Offshore, which holds PPAs and contracts for the Revolution Wind, South Fork Wind and Sunrise Wind projects, as well as an undeveloped offshore lease area. The offshore wind investment includes capital expenditures for the three offshore wind projects, as well as capitalized costs related to future development, acquisition costs of offshore lease areas, and capitalized interest. Cash flows used in investing activities presented in Investments in Unconsolidated Affiliates on the statements of cash flows primarily relates to capital contributions in the offshore wind investment. On May 4, 2022, Eversource announced that it had initiated a strategic review of its offshore wind investment portfolio. As part of that review, Eversource is exploring strategic alternatives that could result in a potential sale of all, or part, of its 50 percent interest in its offshore wind partnership with Ørsted. In late July, Eversource started preliminary and targeted outreach to potential buyers. Eversource continues to work with potential buyers through this ongoing process and expects to complete this review during 2022. Eversource’s strategic review of its offshore wind investment does not impact the September 30, 2022 financial statements. F. Other Taxes Eversource's companies that serve customers in Connecticut collect gross receipts taxes levied by the state of Connecticut from their customers. These gross receipts taxes are recorded separately with collections in Operating Revenues and with payments in Taxes Other Than Income Taxes on the statements of income as follows: For the Three Months Ended For the Nine Months Ended (Millions of Dollars) September 30, 2022 September 30, 2021 September 30, 2022 September 30, 2021 Eversource $ 52.9 $ 49.4 $ 146.0 $ 137.9 CL&P 49.2 46.1 126.0 120.7 As agents for state and local governments, Eversource's companies that serve customers in Connecticut and Massachusetts collect certain sales taxes that are recorded on a net basis with no impact on the statements of income. G. Supplemental Cash Flow Information Non-cash investing activities include plant additions included in Accounts Payable as follows: (Millions of Dollars) As of September 30, 2022 As of September 30, 2021 Eversource $ 394.1 $ 359.6 CL&P 96.7 75.3 NSTAR Electric 94.5 94.2 PSNH 49.7 32.8 The following table reconciles cash and cash equivalents as reported on the balance sheets to the cash, cash equivalents and restricted cash balance as reported on the statements of cash flows: As of September 30, 2022 As of December 31, 2021 (Millions of Dollars) Eversource CL&P NSTAR Electric PSNH Eversource CL&P NSTAR Electric PSNH Cash and Cash Equivalents as reported on the Balance Sheets $ 485.7 $ 14.3 $ 453.6 $ 2.2 $ 66.8 $ 55.8 $ 0.7 $ — Restricted cash included in: Special Deposits 76.5 8.7 17.3 18.7 78.2 18.7 17.4 31.4 Marketable Securities 20.8 0.1 — 0.1 31.3 0.3 0.1 0.5 Other Long-Term Assets 19.3 — — 3.2 44.7 — — 3.2 Cash, Cash Equivalents and Restricted Cash as reported on the Statements of Cash Flows $ 602.3 $ 23.1 $ 470.9 $ 24.2 $ 221.0 $ 74.8 $ 18.2 $ 35.1 Special Deposits represent cash collections related to the PSNH RRB customer charges that are held in trust, required ISO-NE cash deposits, and CYAPC and YAEC cash balances. The December 31, 2021 balance also included a $10 million customer assistance fund to provide bill payment assistance to certain existing non-hardship and hardship customers carrying arrearages at CL&P established under the terms of the PURA-approved October 2021 settlement agreement. Those customers were provided with $10 million of bill forgiveness in the first quarter of 2022, which represented a non-cash transaction. Special Deposits are included in Current Assets on the balance sheets. Restricted cash included in Marketable Securities represents money market funds held in trusts to fund certain non-qualified executive benefits and restricted trusts to fund CYAPC and YAEC's spent nuclear fuel storage obligations. Restricted cash also includes an Energy Relief Fund for energy efficiency and clean energy measures in the Merrimack Valley and an additional energy efficiency program established under the terms of the EGMA 2020 settlement agreement. As of September 30, 2022, $20.0 million of this restricted cash was recorded as short-term in Special Deposits and $15.9 million was recorded in Other Long-Term Assets Other Long-Term Assets

REGULATORY ACCOUNTING

REGULATORY ACCOUNTING	9 Months Ended
REGULATORY ACCOUNTING	Sep. 30, 2022
Regulated Operations [Abstract]
REGULATORY ACCOUNTING	REGULATORY ACCOUNTING Eversource's utility companies are subject to rate regulation that is based on cost recovery and meets the criteria for application of accounting guidance for rate-regulated operations, which considers the effect of regulation on the timing of the recognition of certain revenues and expenses. The regulated companies' financial statements reflect the effects of the rate-making process. The rates charged to the customers of Eversource's regulated companies are designed to collect each company's costs to provide service, plus a return on investment. The application of accounting guidance for rate-regulated enterprises results in recording regulatory assets and liabilities. Regulatory assets represent the deferral of incurred costs that are probable of future recovery in customer rates. Regulatory assets are amortized as the incurred costs are recovered through customer rates. Regulatory liabilities represent either revenues received from customers to fund expected costs that have not yet been incurred or probable future refunds to customers. Management believes it is probable that each of the regulated companies will recover its respective investments in long-lived assets and the regulatory assets that have been recorded. If management were to determine that it could no longer apply the accounting guidance applicable to rate-regulated enterprises, or if management could not conclude it is probable that costs would be recovered from customers in future rates, the applicable costs would be charged to net income in the period in which the determination is made. Regulatory Assets: The components of regulatory assets were as follows: As of September 30, 2022 As of December 31, 2021 (Millions of Dollars) Eversource CL&P NSTAR PSNH Eversource CL&P NSTAR PSNH Benefit Costs $ 1,408.9 $ 263.3 $ 389.0 $ 114.6 $ 1,481.0 $ 272.4 $ 395.5 $ 118.9 Storm Costs, Net 1,243.9 722.5 459.9 61.5 1,102.7 695.6 341.3 65.8 Regulatory Tracking Mechanisms 941.2 214.4 339.0 70.4 1,050.5 333.6 376.6 85.4 Income Taxes, Net 808.5 480.0 114.5 17.4 790.7 470.5 112.6 17.5 Securitized Stranded Costs 446.5 — — 446.5 478.9 — — 478.9 Goodwill-related 285.2 — 244.8 — 297.8 — 255.7 — Derivative Liabilities 195.9 195.9 — — 249.2 249.2 — — Asset Retirement Obligations 124.3 35.3 66.0 4.3 115.0 33.6 59.8 4.1 Other Regulatory Assets 248.0 27.1 32.0 14.1 150.0 29.9 37.7 15.8 Total Regulatory Assets 5,702.4 1,938.5 1,645.2 728.8 5,715.8 2,084.8 1,579.2 786.4 Less: Current Portion 1,143.6 305.6 387.3 110.1 1,129.1 371.6 444.0 107.2 Total Long-Term Regulatory Assets $ 4,558.8 $ 1,632.9 $ 1,257.9 $ 618.7 $ 4,586.7 $ 1,713.2 $ 1,135.2 $ 679.2 Regulatory Costs in Long-Term Assets: Eversource's regulated companies had $288.9 million (including $121.0 million for CL&P, $94.6 million for NSTAR Electric and $2.8 million for PSNH) and $252.5 million (including $114.9 million for CL&P, $85.0 million for NSTAR Electric and $3.4 million for PSNH) of additional regulatory costs as of September 30, 2022 and December 31, 2021, respectively, that were included in long-term assets on the balance sheets. These amounts represent incurred costs for which recovery has not yet been specifically approved by the applicable regulatory agency. However, based on regulatory policies or past precedent on similar costs, management believes it is probable that these costs will ultimately be approved and recovered from customers in rates. As of September 30, 2022 and December 31, 2021, these regulatory costs included incremental COVID-19 related non-tracked uncollectible expense deferred of $34.6 million and $33.0 million at Eversource, $16.5 million and $18.0 million at CL&P, and $2.2 million and $6.1 million at NSTAR Electric, respectively. Regulatory Liabilities: The components of regulatory liabilities were as follows: As of September 30, 2022 As of December 31, 2021 (Millions of Dollars) Eversource CL&P NSTAR PSNH Eversource CL&P NSTAR PSNH EDIT due to Tax Cuts and Jobs Act of 2017 $ 2,629.0 $ 986.1 $ 952.6 $ 350.0 $ 2,685.2 $ 996.1 $ 984.5 $ 359.2 Cost of Removal 654.5 122.4 418.3 19.3 649.6 100.1 381.0 17.2 Regulatory Tracking Mechanisms 957.4 455.7 326.2 165.1 448.4 182.0 185.1 107.0 Deferred Portion of Non-Service Income 240.3 28.9 127.5 25.3 148.3 12.0 90.7 14.9 Benefit Costs 110.9 — 88.1 — 133.5 — 107.4 — AFUDC - Transmission 93.1 46.4 46.7 — 81.0 43.2 37.8 — CL&P Settlement Agreement and Storm — — — — 81.3 81.3 — — Other Regulatory Liabilities 204.6 38.6 4.4 6.7 241.4 45.1 0.8 3.3 Total Regulatory Liabilities 4,889.8 1,678.1 1,963.8 566.4 4,468.7 1,459.8 1,787.3 501.6 Less: Current Portion 988.7 434.5 368.0 185.1 602.4 266.5 228.2 120.2 Total Long-Term Regulatory Liabilities $ 3,901.1 $ 1,243.6 $ 1,595.8 $ 381.3 $ 3,866.3 $ 1,193.3 $ 1,559.1 $ 381.4

PROPERTY, PLANT AND EQUIPMENT A

PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION	9 Months Ended
PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION	Sep. 30, 2022
Property, Plant and Equipment [Abstract]
PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION	PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION The following tables summarize property, plant and equipment by asset category: Eversource As of September 30, 2022 As of December 31, 2021 (Millions of Dollars) Distribution - Electric $ 18,132.2 $ 17,679.1 Distribution - Natural Gas 7,020.1 6,694.8 Transmission - Electric 13,371.2 12,882.4 Distribution - Water 1,971.1 1,900.9 Solar 200.9 200.9 Utility 40,695.5 39,358.1 Other (1) 1,663.4 1,469.5 Property, Plant and Equipment, Gross 42,358.9 40,827.6 Less: Accumulated Depreciation Utility (9,070.0) (8,885.2) Other (672.9) (580.1) Total Accumulated Depreciation (9,742.9) (9,465.3) Property, Plant and Equipment, Net 32,616.0 31,362.3 Construction Work in Progress 2,413.5 2,015.4 Total Property, Plant and Equipment, Net $ 35,029.5 $ 33,377.7 As of September 30, 2022 As of December 31, 2021 (Millions of Dollars) CL&P NSTAR PSNH CL&P NSTAR PSNH Distribution - Electric $ 7,297.2 $ 8,329.1 $ 2,546.2 $ 7,117.6 $ 8,105.5 $ 2,496.2 Transmission - Electric 6,022.8 5,243.3 2,106.8 5,859.0 5,090.5 1,934.6 Solar — 200.9 — — 200.9 — Property, Plant and Equipment, Gross 13,320.0 13,773.3 4,653.0 12,976.6 13,396.9 4,430.8 Less: Accumulated Depreciation (2,571.5) (3,322.3) (908.2) (2,572.1) (3,227.3) (908.4) Property, Plant and Equipment, Net 10,748.5 10,451.0 3,744.8 10,404.5 10,169.6 3,522.4 Construction Work in Progress 478.2 914.2 172.8 399.0 707.0 134.1 Total Property, Plant and Equipment, Net $ 11,226.7 $ 11,365.2 $ 3,917.6 $ 10,803.5 $ 10,876.6 $ 3,656.5 (1) These assets are primarily comprised of computer software, hardware and equipment at Eversource Service and buildings at The Rocky River Realty Company.

DERIVATIVE INSTRUMENTS

DERIVATIVE INSTRUMENTS	9 Months Ended
DERIVATIVE INSTRUMENTS	Sep. 30, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVE INSTRUMENTS	DERIVATIVE INSTRUMENTS The electric and natural gas companies purchase and procure energy and energy-related products, which are subject to price volatility, for their customers. The costs associated with supplying energy to customers are recoverable from customers in future rates. These regulated companies manage the risks associated with the price volatility of energy and energy-related products through the use of derivative and non-derivative contracts. Many of the derivative contracts meet the definition of, and are designated as, normal and qualify for accrual accounting under the applicable accounting guidance. The costs and benefits of derivative contracts that meet the definition of normal are recognized in Operating Expenses on the statements of income as electricity or natural gas is delivered. Derivative contracts that are not designated as normal are recorded at fair value as current or long-term Derivative Assets or Derivative Liabilities on the balance sheets. For the electric and natural gas companies, regulatory assets or regulatory liabilities are recorded to offset the fair values of derivatives, as contract settlement amounts are recovered from, or refunded to, customers in their respective energy supply rates. The gross fair values of derivative assets and liabilities with the same counterparty are offset and reported as net Derivative Assets or Derivative Liabilities, with current and long-term portions, on the balance sheets. The following table presents the gross fair values of contracts, categorized by risk type, and the net amounts recorded as current or long-term derivative assets or liabilities: As of September 30, 2022 As of December 31, 2021 CL&P (Millions of Dollars) Fair Value Hierarchy Commodity Supply and Price Risk Netting (1) Net Amount Commodity Supply and Price Risk Netting (1) Net Amount Current Derivative Assets Level 3 $ 15.7 $ (0.5) $ 15.2 $ 14.7 $ (1.0) $ 13.7 Long-Term Derivative Assets Level 3 32.8 (1.0) 31.8 46.9 (0.9) 46.0 Current Derivative Liabilities Level 3 (78.6) — (78.6) (73.5) — (73.5) Long-Term Derivative Liabilities Level 3 (164.3) — (164.3) (235.4) — (235.4) (1) Amounts represent derivative assets and liabilities that Eversource elected to record net on the balance sheets. These amounts are subject to master netting agreements or similar agreements for which the right of offset exists. Derivative Contracts at Fair Value with Offsetting Regulatory Amounts Commodity Supply and Price Risk Management : As required by regulation, CL&P, along with UI, has capacity-related contracts with generation facilities. CL&P has a sharing agreement with UI, with 80 percent of the costs or benefits of each contract borne by or allocated to CL&P and 20 percent borne by or allocated to UI. The combined capacities of these contracts as of both September 30, 2022 and December 31, 2021 were 675 MW. The capacity contracts extend through 2026 and obligate both CL&P and UI to make or receive payments on a monthly basis to or from the generation facilities based on the difference between a set capacity price and the capacity market price received in the ISO-NE capacity markets. For the three months ended September 30, 2022 and 2021, there were gains of $2.4 million and $0.7 million, respectively, deferred as regulatory costs, which reflect the change in fair value associated with Eversource's derivative contracts. For the nine months ended September 30, 2022 and 2021, there were gains of $11.2 million and losses of $9.5 million, respectively. Fair Value Measurements of Derivative Instruments The fair value of derivative contracts classified as Level 3 utilizes both significant observable and unobservable inputs. The fair value is modeled using income techniques, such as discounted cash flow valuations adjusted for assumptions related to exit price. Valuations of derivative contracts using a discounted cash flow methodology include assumptions regarding the timing and likelihood of scheduled payments and also reflect non-performance risk, including credit, using the default probability approach based on the counterparty's credit rating for assets and the Company's credit rating for liabilities. Significant observable inputs for valuations of these contracts include energy-related product prices in future years for which quoted prices in an active market exist. Valuations incorporate estimates of premiums or discounts that would be required by a market participant to arrive at an exit price, using historical market transactions adjusted for the terms of the contract. Fair value measurements categorized in Level 3 of the fair value hierarchy are prepared by individuals with expertise in valuation techniques, pricing of energy-related products, and accounting requirements. The following is a summary of the significant unobservable inputs utilized in the valuations of the derivative contracts classified as Level 3: As of September 30, 2022 As of December 31, 2021 CL&P Range Average Period Covered Range Average Period Covered Forward Reserve Prices $ 0.44 — $0.50 $ 0.47 per kW-Month 2023 - 2024 $ 0.50 — $1.15 $ 0.82 per kW-Month 2022 - 2024 Exit price premiums of 3.4 percent through 7.7 percent, or a weighted average of 6.6 percent, are also Level 3 significant unobservable inputs applied to these contracts and reflect the uncertainty and illiquidity premiums that would be required based on the most recent market activity available for similar type contracts. The risk premium was weighted by the relative fair value of the net derivative instruments. As of December 31, 2021, Level 3 unobservable inputs also utilized in the valuation of CL&P’s capacity-related contracts included capacity prices of $2.61 per kW-Month over the period 2025 through 2026. Beginning in the first quarter of 2022, these capacity price inputs are now observable. Significant increases or decreases in future capacity or forward reserve prices in isolation would decrease or increase, respectively, the fair value of the derivative liability. Any increases in risk premiums would increase the fair value of the derivative liability. Changes in these fair values are recorded as a regulatory asset or liability and do not impact net income. The following table presents changes in the Level 3 category of derivative assets and derivative liabilities measured at fair value on a recurring basis. The derivative assets and liabilities are presented on a net basis. CL&P For the Three Months Ended September 30, For the Nine Months Ended September 30, (Millions of Dollars) 2022 2021 2022 2021 Derivatives, Net: Fair Value as of Beginning of Period $ (213.3) $ (279.7) $ (249.2) $ (293.1) Net Realized/Unrealized Gains/(Losses) Included in Regulatory Assets 2.4 0.7 11.2 (10.9) Settlements 15.0 13.7 42.1 38.7 Fair Value as of End of Period $ (195.9) $ (265.3) $ (195.9) $ (265.3)

MARKETABLE SECURITIES

MARKETABLE SECURITIES	9 Months Ended
MARKETABLE SECURITIES	Sep. 30, 2022
Investments, Debt and Equity Securities [Abstract]
MARKETABLE SECURITIES	MARKETABLE SECURITIES Eversource holds marketable securities that are primarily used to fund certain non-qualified executive benefits. The trusts that hold these marketable securities are not subject to regulatory oversight by state or federal agencies. Eversource’s marketable securities also include the CYAPC and YAEC legally restricted trusts that each hold equity and available-for-sale debt securities to fund the spent nuclear fuel removal obligations of their nuclear fuel storage facilities. Equity and available-for-sale debt marketable securities are recorded at fair value, with the current portion recorded in Prepayments and Other Current Assets and the long-term portion recorded in Marketable Securities on the balance sheets. Equity Securities: Unrealized gains and losses on equity securities held in Eversource's non-qualified executive benefit trust are recorded in Other Income, Net on the statements of income. The fair value of these equity securities as of September 30, 2022 and December 31, 2021 was $23.3 million and $40.2 million, respectively. For the three months ended September 30, 2022 and 2021, there were unrealized losses of $1.5 million and $0.5 million, respectively, recorded in Other Income, Net related to these equity securities. For the nine months ended September 30, 2022 and 2021, there were unrealized losses of $10.6 million and unrealized gains of $2.5 million recorded in Other Income, Net related to these equity securities, respectively. Eversource's equity securities also include CYAPC's and YAEC's marketable securities held in spent nuclear fuel trusts, which had fair values of $170.1 million and $214.0 million as of September 30, 2022 and December 31, 2021, respectively. Unrealized gains and losses for these spent nuclear fuel trusts are subject to regulatory accounting treatment and are recorded in Marketable Securities with the corresponding offset to long-term liabilities on the balance sheets, with no impact on the statements of income. Available-for-Sale Debt Securities: The following is a summary of the available-for-sale debt securities: As of September 30, 2022 As of December 31, 2021 Eversource (Millions of Dollars) Amortized Cost Pre-Tax Pre-Tax Fair Value Amortized Cost Pre-Tax Pre-Tax Fair Value Debt Securities $ 205.4 $ 0.2 $ (15.5) $ 190.1 $ 214.5 $ 5.1 $ (0.2) $ 219.4 Unrealized gains and losses on available-for-sale debt securities held in Eversource's non-qualified executive benefit trust are recorded in Accumulated Other Comprehensive Income, excluding amounts related to credit losses or losses on securities intended to be sold, which are recorded in Other Income, Net. There have been no credit losses for the three and nine months ended September 30, 2022 and 2021, and no allowance for credit losses as of September 30, 2022. Factors considered in determining whether a credit loss exists include adverse conditions specifically affecting the issuer, the payment history, ratings and rating changes of the security, and the severity of the impairment. For asset-backed debt securities, underlying collateral and expected future cash flows are also evaluated. Debt securities included in Eversource's non-qualified benefit trust portfolio are investment-grade bonds with a lower default risk based on their credit quality. Eversource's debt securities also include CYAPC's and YAEC's marketable securities held in spent nuclear fuel trusts in the amounts of $170.3 million and $189.9 million as of September 30, 2022 and December 31, 2021, respectively. Unrealized gains and losses for available-for-sale debt securities included in the CYAPC and YAEC spent nuclear fuel trusts are subject to regulatory accounting treatment and are recorded in Marketable Securities with the corresponding offset to long-term liabilities on the balance sheets, with no impact on the statements of income. Pre-tax unrealized gains and losses as of September 30, 2022 and December 31, 2021 primarily relate to the debt securities included in CYAPC's and YAEC's spent nuclear fuel trusts. As of September 30, 2022, the contractual maturities of available-for-sale debt securities were as follows: Eversource (Millions of Dollars) Amortized Cost Fair Value Less than one year (1) $ 22.4 $ 22.4 One to five years 56.0 54.6 Six to ten years 40.8 36.7 Greater than ten years 86.2 76.4 Total Debt Securities $ 205.4 $ 190.1 (1) Amounts in the Less than one year category include securities in the CYAPC and YAEC spent nuclear fuel trusts, which are restricted and are classified in long-term Marketable Securities on the balance sheets. Realized Gains and Losses: Realized gains and losses are recorded in Other Income, Net for Eversource's benefit trust and are offset in long-term liabilities for CYAPC and YAEC. Eversource utilizes the specific identification basis method for the Eversource non-qualified benefit trust, and the average cost basis method for the CYAPC and YAEC spent nuclear fuel trusts to compute the realized gains and losses on the sale of marketable securities. Fair Value Measurements: The following table presents the marketable securities recorded at fair value on a recurring basis by the level in which they are classified within the fair value hierarchy: Eversource (Millions of Dollars) As of September 30, 2022 As of December 31, 2021 Level 1: Mutual Funds and Equities $ 193.4 $ 254.2 Money Market Funds 20.8 31.3 Total Level 1 $ 214.2 $ 285.5 Level 2: U.S. Government Issued Debt Securities (Agency and Treasury) $ 77.4 $ 81.3 Corporate Debt Securities 54.8 65.3 Asset-Backed Debt Securities 9.5 12.6 Municipal Bonds 13.0 12.3 Other Fixed Income Securities 14.6 16.6 Total Level 2 $ 169.3 $ 188.1 Total Marketable Securities $ 383.5 $ 473.6 U.S. government issued debt securities are valued using market approaches that incorporate transactions for the same or similar bonds and adjustments for yields and maturity dates. Corporate debt securities are valued using a market approach, utilizing recent trades of the same or similar instruments and also incorporating yield curves, credit spreads and specific bond terms and conditions. Asset-backed debt securities include collateralized mortgage obligations, commercial mortgage backed securities, and securities collateralized by auto loans, credit card loans or receivables. Asset-backed debt securities are valued using recent trades of similar instruments, prepayment assumptions, yield curves, issuance and maturity dates, and tranche information. Municipal bonds are valued using a market approach that incorporates reported trades and benchmark yields. Other fixed income securities are valued using pricing models, quoted prices of securities with similar characteristics, and discounted cash flows.

SHORT-TERM AND LONG-TERM DEBT

SHORT-TERM AND LONG-TERM DEBT	9 Months Ended
SHORT-TERM AND LONG-TERM DEBT	Sep. 30, 2022
Debt Disclosure [Abstract]
SHORT-TERM AND LONG-TERM DEBT	SHORT-TERM AND LONG-TERM DEBT Short-Term Debt - Commercial Paper Programs and Credit Agreements : Eversource parent has a $2.00 billion commercial paper program allowing Eversource parent to issue commercial paper as a form of short-term debt. Eversource parent, CL&P, PSNH, NSTAR Gas, Yankee Gas, EGMA and Aquarion Water Company of Connecticut are parties to a five-year $2.00 billion revolving credit facility, which terminates on October 15, 2027. This revolving credit facility serves to backstop Eversource parent's $2.00 billion commercial paper program. NSTAR Electric has a $650 million commercial paper program allowing NSTAR Electric to issue commercial paper as a form of short-term debt. NSTAR Electric is also a party to a five-year $650 million revolving credit facility, which terminates on October 15, 2027. This revolving credit facility serves to backstop NSTAR Electric's $650 million commercial paper program. The amount of borrowings outstanding and available under the commercial paper programs were as follows: Borrowings Outstanding as of Available Borrowing Capacity as of Weighted-Average Interest Rate as of September 30, 2022 December 31, 2021 September 30, 2022 December 31, 2021 September 30, 2022 December 31, 2021 (Millions of Dollars) Eversource Parent Commercial Paper Program $ 401.5 $ 1,343.0 $ 1,598.5 $ 657.0 3.34 % 0.31 % NSTAR Electric Commercial Paper Program — 162.5 650.0 487.5 — % 0.14 % There were no borrowings outstanding on the revolving credit facilities as of September 30, 2022 or December 31, 2021. CL&P and PSNH have uncommitted line of credit agreements totaling $450 million and $300 million, respectively, which will expire on May 12, 2023. There are no borrowings outstanding on either the CL&P or PSNH uncommitted line of credit agreements as of September 30, 2022. Amounts outstanding under the commercial paper programs are included in Notes Payable and classified in current liabilities on the Eversource and NSTAR Electric balance sheets, as all borrowings are outstanding for no more than 364 days at one time. Intercompany Borrowings: Eversource parent uses its available capital resources to provide loans to its subsidiaries to assist in meeting their short-term borrowing needs. Eversource parent records intercompany interest income from its loans to subsidiaries, which is eliminated in consolidation. Intercompany loans from Eversource parent to its subsidiaries are eliminated in consolidation on Eversource's balance sheets. As of September 30, 2022, there were intercompany loans from Eversource parent to CL&P of $26.0 million, to PSNH of $139.7 million, and to a subsidiary of NSTAR Electric of $2.8 million. As of December 31, 2021, there were intercompany loans from Eversource parent to PSNH of $110.6 million. Intercompany loans from Eversource parent are included in Notes Payable to Eversource Parent and classified in current liabilities on the respective subsidiary's balance sheets. Sources and Uses of Cash: The Company expects the future operating cash flows of Eversource, CL&P, NSTAR Electric and PSNH, along with existing borrowing availability and access to both debt and equity markets, will be sufficient to meet any working capital and future operating requirements, and capital investment forecasted opportunities. Availability under Long-Term Debt Issuance Authorizations: On June 14, 2022, the DPU approved NSTAR Gas’ request for authorization to issue up to $325 million in long-term debt through December 31, 2024. Long-Term Debt Issuances and Repayments: The following table summarizes long-term debt issuances and repayments: (Millions of Dollars) Issuance/(Repayment) Issue Date or Repayment Date Maturity Date Use of Proceeds for Issuance/ NSTAR Electric 4.55% 2022 Debentures $ 450.0 May 2022 June 2052 Repaid short-term debt, paid capital expenditures and working capital NSTAR Electric 4.95% 2022 Debentures 400.0 September 2022 September 2052 Refinanced investments in eligible green expenditures, which were previously financed using short-term debt from October 1, 2020 through June 30, 2022 NSTAR Electric 2.375% 2012 Debentures (400.0) October 2022 October 2022 Paid at maturity Eversource Parent 2.90% Series V Senior Notes 650.0 February 2022 March 2027 Repaid Series K Senior Notes at maturity and short-term debt Eversource Parent 3.375% Series W Senior Notes 650.0 February 2022 March 2032 Repaid Series K Senior Notes at maturity and short-term debt Eversource Parent 4.20% Series X Senior Notes 900.0 June 2022 June 2024 Repaid short-term debt and paid working capital Eversource Parent 4.60% Series Y Senior Notes 600.0 June 2022 July 2027 Repaid short-term debt and paid working capital Eversource Parent 2.75% Series K Senior Notes (750.0) March 2022 March 2022 Paid at maturity Yankee Gas 8.48% Series B First Mortgage Bonds (20.0) March 2022 March 2022 Paid at maturity Yankee Gas 4.31% Series U First Mortgage Bonds 100.0 September 2022 September 2032 Repaid short-term debt, paid capital expenditures and for general corporate purposes EGMA 4.70% Series C First Mortgage Bonds 100.0 June 2022 June 2052 Repaid short-term debt, paid capital expenditures and for general corporate purposes NSTAR Gas 4.40% Series V First Mortgage Bonds 125.0 July 2022 August 2032 Repaid short-term debt, paid capital expenditures and for general corporate purposes Aquarion Water Company of New Hampshire 4.45% General Mortgage Bonds (5.0) 0 July 2022 July 2022 Paid at maturity Aquarion Water Company of Connecticut 4.69% Senior Notes 70.0 August 2022 September 2052 Repaid short-term debt Cash Equivalents on the Eversource and NSTAR Electric balance sheets as of September 30, 2022 comprise a money market fund that primarily included proceeds received from an NSTAR Electric $400 million long-term debt issuance on September 15, 2022 that was used to pay $400 million of long-term debt that matured on October 15, 2022.

RATE REDUCTION BONDS AND VARIAB

RATE REDUCTION BONDS AND VARIABLE INTEREST ENTITIES	9 Months Ended
RATE REDUCTION BONDS AND VARIABLE INTEREST ENTITIES	Sep. 30, 2022
Rate Reduction Bonds and Variable Interest Entity [Abstract]
RATE REDUCTION BONDS AND VARIABLE INTEREST ENTITIES	RATE REDUCTION BONDS AND VARIABLE INTEREST ENTITIES Rate Reduction Bonds: In May 2018, PSNH Funding, a wholly-owned subsidiary of PSNH, issued $635.7 million of securitized RRBs in multiple tranches with a weighted average interest rate of 3.66 percent, and final maturity dates ranging from 2026 to 2035. The RRBs are expected to be repaid by February 1, 2033. RRB payments consist of principal and interest and are paid semi-annually, beginning on February 1, 2019. The RRBs were issued pursuant to a finance order issued by the NHPUC in January 2018 to recover remaining costs resulting from the divestiture of PSNH’s generation assets. PSNH Funding was formed solely to issue RRBs to finance PSNH's unrecovered remaining costs associated with the divestiture of its generation assets. PSNH Funding is considered a VIE primarily because the equity capitalization is insufficient to support its operations. PSNH has the power to direct the significant activities of the VIE and is most closely associated with the VIE as compared to other interest holders. Therefore, PSNH is considered the primary beneficiary and consolidates PSNH Funding in its consolidated financial statements. The following tables summarize the impact of PSNH Funding on PSNH's balance sheets and income statements: (Millions of Dollars) PSNH Balance Sheets: As of September 30, 2022 As of December 31, 2021 Restricted Cash - Current Portion (included in Current Assets) $ 18.0 $ 31.1 Restricted Cash - Long-Term Portion (included in Other Long-Term Assets) 3.2 3.2 Securitized Stranded Cost (included in Regulatory Assets) 446.5 478.9 Other Regulatory Liabilities (included in Regulatory Liabilities) 7.9 5.4 Accrued Interest (included in Other Current Liabilities) 2.8 7.5 Rate Reduction Bonds - Current Portion 43.2 43.2 Rate Reduction Bonds - Long-Term Portion 410.5 453.7 (Millions of Dollars) PSNH Income Statements: For the Three Months Ended For the Nine Months Ended September 30, 2022 September 30, 2021 September 30, 2022 September 30, 2021 Amortization of RRB Principal (included in Amortization of Regulatory Assets, Net) $ 10.8 $ 10.8 $ 32.4 $ 32.4 Interest Expense on RRB Principal (included in Interest Expense) 4.2 4.5 12.9 13.9

PENSION BENEFITS AND POSTRETIRE

PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSION	9 Months Ended
	Sep. 30, 2022
Postemployment Benefits [Abstract]
PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSION	PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSION Eversource provides defined benefit retirement plans (Pension Plans) that cover eligible employees. In addition to the Pension Plans, Eversource maintains non-qualified defined benefit retirement plans (SERP Plans), which provide benefits in excess of Internal Revenue Code limitations to eligible participants consisting of current and retired employees. Eversource also provides defined benefit postretirement plans (PBOP Plans) that provide life insurance and a health reimbursement arrangement created for the purpose of reimbursing retirees and dependents for health insurance premiums and certain medical expenses to eligible employees that meet certain age and service eligibility requirements. The components of net periodic benefit plan expense/(income) for the Pension, SERP and PBOP Plans, prior to amounts capitalized as Property, Plant and Equipment or deferred as regulatory assets/(liabilities) for future recovery or refund, are shown below. The service cost component of net periodic benefit plan expense/(income), less the capitalized portion, is included in Operations and Maintenance expense on the statements of income. The remaining components of net periodic benefit plan expense/(income), less the deferred portion, are included in Other Income, Net on the statements of income. Pension, SERP and PBOP expense/(income) reflected in the statements of cash flows for CL&P, NSTAR Electric and PSNH does not include intercompany allocations of net periodic benefit plan expense/(income), as these amounts are cash settled on a short-term basis. Pension and SERP PBOP For the Three Months Ended September 30, 2022 For the Three Months Ended September 30, 2022 (Millions of Dollars) Eversource CL&P NSTAR Electric PSNH Eversource CL&P NSTAR Electric PSNH Service Cost $ 17.5 $ 4.7 $ 3.4 $ 1.7 $ 2.9 $ 0.5 $ 0.5 $ 0.3 Interest Cost 38.6 7.8 8.2 4.2 5.0 0.9 1.3 0.5 Expected Return on Plan Assets (130.7) (26.5) (32.1) (14.0) (22.5) (2.8) (10.6) (1.7) Actuarial Losses, net 28.4 4.0 8.1 1.9 — — — — Prior Service Cost/(Credit) 0.4 — 0.1 — (5.4) 0.3 (4.2) 0.1 Total Net Periodic Benefit Plan Income $ (45.8) $ (10.0) $ (12.3) $ (6.2) $ (20.0) $ (1.1) $ (13.0) $ (0.8) Intercompany Income Allocations N/A $ (4.0) $ (3.2) $ (1.0) N/A $ (0.9) $ (0.9) $ (0.3) Pension and SERP PBOP For the Nine Months Ended September 30, 2022 For the Nine Months Ended September 30, 2022 (Millions of Dollars) Eversource CL&P NSTAR PSNH Eversource CL&P NSTAR PSNH Service Cost $ 52.7 $ 13.9 $ 10.4 $ 5.2 $ 8.7 $ 1.5 $ 1.5 $ 0.8 Interest Cost 115.8 23.4 24.5 12.6 15.1 2.7 3.9 1.6 Expected Return on Plan Assets (393.1) (79.6) (96.2) (42.1) (67.5) (8.4) (31.8) (5.0) Actuarial Losses, net 87.5 12.2 24.7 6.0 — — — — Prior Service Cost/(Credit) 1.1 — 0.3 — (16.2) 0.8 (12.7) 0.3 Total Net Periodic Benefit Plan Income $ (136.0) $ (30.1) $ (36.3) $ (18.3) $ (59.9) $ (3.4) $ (39.1) $ (2.3) Intercompany Income Allocations N/A $ (11.9) $ (9.3) $ (2.7) N/A $ (2.7) $ (2.7) $ (0.9) Pension and SERP PBOP For the Three Months Ended September 30, 2021 For the Three Months Ended September 30, 2021 (Millions of Dollars) Eversource CL&P NSTAR PSNH Eversource CL&P NSTAR PSNH Service Cost $ 21.5 $ 5.6 $ 4.0 $ 2.2 $ 3.3 $ 0.5 $ 0.6 $ 0.3 Interest Cost 32.5 6.7 6.7 3.7 4.3 0.8 1.1 0.4 Expected Return on Plan Assets (109.5) (21.7) (27.1) (11.9) (19.8) (2.5) (9.2) (1.6) Actuarial Loss 60.7 10.8 15.3 5.3 2.0 0.4 0.5 0.1 Prior Service Cost/(Credit) 0.3 — 0.1 — (5.3) 0.3 (4.3) 0.1 Total Net Periodic Benefit Plan Expense/(Income) $ 5.5 $ 1.4 $ (1.0) $ (0.7) $ (15.5) $ (0.5) $ (11.3) $ (0.7) Intercompany Expense/(Income) Allocations N/A $ 2.2 $ 2.4 $ 0.7 N/A $ (0.4) $ (0.5) $ (0.2) Pension and SERP PBOP For the Nine Months Ended September 30, 2021 For the Nine Months Ended September 30, 2021 (Millions of Dollars) Eversource CL&P NSTAR PSNH Eversource CL&P NSTAR PSNH Service Cost $ 64.3 $ 17.4 $ 11.9 $ 6.6 $ 10.1 $ 1.7 $ 1.8 $ 0.9 Interest Cost 97.5 20.7 20.1 10.9 12.9 2.4 3.3 1.3 Expected Return on Plan Assets (328.0) (65.0) (81.1) (35.6) (59.3) (7.7) (27.7) (4.6) Actuarial Loss 183.1 34.6 46.1 15.4 5.9 1.2 1.6 0.4 Prior Service Cost/(Credit) 1.1 — 0.3 — (15.9) 0.8 (12.7) 0.3 Total Net Periodic Benefit Plan Expense/(Income) $ 18.0 $ 7.7 $ (2.7) $ (2.7) $ (46.3) $ (1.6) $ (33.7) $ (1.7) Intercompany Expense/(Income) Allocations N/A $ 5.8 $ 6.4 $ 1.9 N/A $ (1.3) $ (1.5) $ (0.5) Eversource Contributions: Based on the current status of the Pension Plans and federal pension funding requirements, there is no minimum funding requirement for our Pension Plans for 2022. Eversource has contributed $80 million to its Pension and PBOP Plans for the nine months ended September 30, 2022 and does not expect to make additional pension contributions for the remainder of 2022.

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	9 Months Ended
COMMITMENTS AND CONTINGENCIES	Sep. 30, 2022
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES A. Environmental Matters Eversource, CL&P, NSTAR Electric and PSNH are subject to environmental laws and regulations intended to mitigate or remove the effect of past operations and improve or maintain the quality of the environment. These laws and regulations require the removal or the remedy of the effect on the environment of the disposal or release of certain specified hazardous substances at current and former operating sites. Eversource, CL&P, NSTAR Electric and PSNH have an active environmental auditing and training program and each believes it is substantially in compliance with all enacted laws and regulations. The number of environmental sites and related reserves for which remediation or long-term monitoring, preliminary site work or site assessment is being performed are as follows: As of September 30, 2022 As of December 31, 2021 Number of Sites Reserve Number of Sites Reserve Eversource 62 $ 121.1 61 $ 115.4 CL&P 14 14.1 14 13.9 NSTAR Electric 11 3.5 11 3.3 PSNH 9 6.2 9 6.3 Included in the number of sites and reserve amounts above are former MGP sites that were operated several decades ago and manufactured natural gas from coal and other processes, which resulted in certain by-products remaining in the environment that may pose a potential risk to human health and the environment, for which Eversource may have potential liability. The reserve balances related to these former MGP sites were $110.6 million and $105.6 million as of September 30, 2022 and December 31, 2021, respectively, and related primarily to the natural gas business segment. These reserve estimates are subjective in nature as they take into consideration several different remediation options at each specific site. The reliability and precision of these estimates can be affected by several factors, including new information concerning either the level of contamination at the site, the extent of Eversource's, CL&P's, NSTAR Electric's and PSNH's responsibility for remediation or the extent of remediation required, recently enacted laws and regulations or changes in cost estimates due to certain economic factors. It is possible that new information or future developments could require a reassessment of the potential exposure to required environmental remediation. As this information becomes available, management will continue to assess the potential exposure and adjust the reserves accordingly. B. Long-Term Contractual Arrangements The following is an update to the current status of long-term contractual arrangements set forth in Note 13B of the Eversource 2021 Form 10-K. Renewable Energy : Renewable energy contracts include non-cancelable commitments under contracts of NSTAR Electric for the purchase of energy and RECs from renewable energy facilities. NSTAR Electric (Millions of Dollars) 2022 2023 2024 2025 2026 Thereafter Total Renewable Energy $ 27.1 $ 78.3 $ 269.4 $ 315.8 $ 322.1 $ 5,812.2 $ 6,824.9 The table includes long-term commitments of NSTAR Electric pertaining to the Vineyard Wind LLC contract awarded under the Massachusetts Clean Energy 83C procurement solicitation. NSTAR Electric, along with other Massachusetts distribution companies, entered into 20-year contracts to purchase electricity generated by this 800 megawatt offshore wind project. Construction on the Vineyard Wind project commenced in 2022. Estimated energy costs under this contract are expected to begin when the facilities are in service in 2024 and range between $240 million and $375 million per year und er NSTAR Electric’s 20-year contract, totaling approximately $6.0 billion. C. Guarantees and Indemnifications In the normal course of business, Eversource parent provides credit assurances on behalf of its subsidiaries, including CL&P, NSTAR Electric and PSNH, in the form of guarantees. Management does not anticipate a material impact to net income or cash flows as a result of these various guarantees and indemnifications. Guarantees issued on behalf of unconsolidated entities, including equity method offshore wind investments, for which Eversource parent is the guarantor, are recorded at fair value as a liability on the balance sheet at the inception of the guarantee. Eversource regularly reviews performance risk under these guarantee arrangements, and in the event it becomes probable that Eversource parent will be required to perform under the guarantee, the amount of probable payment will be recorded. The fair value of guarantees issued on behalf of unconsolidated entities are recorded within Other Long-Term Liabilities on the balance sheet, and were $4.3 million and $7.3 million as of September 30, 2022 and December 31, 2021, respectively. The following table summarizes Eversource parent's exposure to guarantees and indemnifications of its subsidiaries and affiliates to external parties, and primarily relates to its offshore wind business: As of September 30, 2022 Company (Obligor) Description Maximum Exposure Expiration Dates North East Offshore LLC Construction-related purchase agreements with third-party contractors (1) $ 759.6 (1) Sunrise Wind LLC Construction-related purchase agreements with third-party contractors (2) 288.1 2025 - 2026 Revolution Wind, LLC Construction-related purchase agreements with third-party contractors (3) 419.0 2024 - 2027 South Fork Wind, LLC Construction-related purchase agreements with third-party contractors (4) 142.7 2023 - 2026 Eversource Investment LLC Funding and indemnification obligations of North East Offshore LLC (5) 94.8 (5) South Fork Wind, LLC Power Purchase Agreement Security (6) 7.1 (6) Sunrise Wind LLC OREC capacity production (7) 2.2 (7) Bay State Wind LLC Real estate purchase 2.5 2023 South Fork Wind, LLC Transmission interconnection 1.2 — Eversource Investment LLC Letters of Credit (8) 4.3 — Various Surety bonds (9) 35.7 2022 - 2023 Eversource Service Lease payments for real estate 0.6 2024 (1) Eversource parent issued guarantees on behalf of its 50 percent-owned affiliate, North East Offshore LLC (NEO), under which Eversource parent agreed to guarantee 50 percent of NEO’s performance of obligations under certain purchase agreements with third-party contractors, in an aggregate amount not to exceed $1.3 billion with an expiration date in 2025. Eversource parent also issued a separate guarantee to Ørsted on behalf of NEO, under which Eversource parent agreed to guarantee 50 percent of NEO’s payment obligations under certain offshore wind project construction-related agreements with Ørsted in an aggregate amount not to exceed $62.5 million and expiring upon full performance of the guaranteed obligation. Any amounts paid under this guarantee to Ørsted will count toward, but not increase, the maximum amount of the Funding Guarantee described in Note 5, below. (2) Eversource parent issued guarantees on behalf of its 50 percent-owned affiliate, Sunrise Wind LLC, whereby Eversource parent will guarantee Sunrise Wind LLC's performance of certain obligations, in an aggregate amount not to exceed $461.9 million, in connection with construction-related purchase agreements. Eversource parent’s obligations under the guarantees expire upon the earlier of (i) dates ranging from March 2025 and April 2026 and (ii) full performance of the guaranteed obligations. (3) Eversource parent issued guarantees on behalf of its 50 percent-owned affiliate, Revolution Wind, LLC, whereby Eversource parent will guarantee Revolution Wind, LLC's performance of certain obligations, in an aggregate amount not to exceed $542.1 million, in connection with construction-related purchase agreements. Eversource parent’s obligations under the guarantees expire upon the earlier of (i) dates ranging from May 2024 and November 2027 and (ii) full performance of the guaranteed obligations. (4) Eversource parent issued guarantees on behalf of its 50 percent-owned affiliate, South Fork Wind, LLC, whereby Eversource parent will guarantee South Fork Wind, LLC's performance of certain obligations in connection with construction-related purchase agreements. Under these guarantees, Eversource parent will guarantee South Fork Wind, LLC's performance of certain obligations, in a total aggregate amount not to exceed $206.6 million. Eversource parent’s obligations under these guarantees expire upon the earlier of (i) dates ranging from June 2023 and August 2026 and (ii) full performance of the guaranteed obligations. (5) Eversource parent issued a guarantee (Funding Guarantee) on behalf of Eversource Investment LLC (EI), its wholly-owned subsidiary that holds a 50 percent ownership interest in NEO, under which Eversource parent agreed to guarantee certain funding obligations and certain indemnification payments of EI under the operating agreement of NEO, in an amount not to exceed $910 million. The guaranteed obligations include payment of EI's funding obligations during the construction phase of NEO’s underlying offshore wind projects and indemnification obligations associated with third party credit support for its investment in NEO. Eversource parent’s obligations under the Funding Guarantee expire upon the full performance of the guaranteed obligations. (6) Eversource parent issued a guarantee on behalf of its 50 percent-owned affiliate, South Fork Wind, LLC, whereby Eversource parent will guarantee South Fork Wind, LLC's performance of certain obligations, in an amount not to exceed $7.1 million, under a Power Purchase Agreement between the Long Island Power Authority and South Fork Wind, LLC (the Agreement). The guarantee expires upon the later of (i) the end of the Agreement term and (ii) full performance of the guarantee obligations. (7) Eversource parent issued a guarantee on behalf of its 50 percent-owned affiliate, Sunrise Wind LLC, whereby Eversource parent will guarantee Sunrise Wind LLC's performance of certain obligations, in an amount not to exceed $15.4 million, under the Offshore Wind Renewable Energy Certificate Purchase and Sale Agreement (the Agreement). The Agreement was executed by and between the New York State Energy Research and Development Authority (NYSERDA) and Sunrise Wind LLC. The guarantee expires upon the full performance of the guaranteed obligations. (8) On September 16, 2020, Eversource parent entered into a guarantee on behalf of EI, which holds Eversource's investments in offshore wind-related equity method investments, under which Eversource parent would guarantee EI's obligations under a letter of credit facility with a financial institution that EI may request in an aggregate amount of up to approximately $25 million. In January 2022, Eversource parent issued two letters of credit on behalf of South Fork Wind, LLC related to future decommissioning obligations of certain onshore transmission assets totaling $4.3 million. (9) Surety bond expiration dates reflect termination dates, the majority of which will be renewed or extended. Certain surety bonds contain credit ratings triggers that would require Eversource parent to post collateral in the event that the unsecured debt credit ratings of Eversource parent are downgraded. D. Spent Nuclear Fuel Obligations - Yankee Companies CL&P, NSTAR Electric and PSNH have plant closure and fuel storage cost obligations to the Yankee Companies, which have each completed the physical decommissioning of their respective nuclear power facilities and are now engaged in the long-term storage of their spent fuel. The Yankee Companies fund these costs through litigation proceeds received from the DOE and, to the extent necessary, through wholesale, FERC-approved rates charged under power purchase agreements with several New England utilities, including CL&P, NSTAR Electric and PSNH. CL&P, NSTAR Electric and PSNH, in turn recover these costs from their customers through state regulatory commission-approved retail rates. The Yankee Companies collect amounts that management believes are adequate to recover the remaining plant closure and fuel storage cost estimates for the respective plants. Management believes CL&P and NSTAR Electric will recover their shares of these obligations from their customers. PSNH has recovered its total share of these costs from its customers. Spent Nuclear Fuel Litigation: The Yankee Companies have filed complaints against the DOE in the Court of Federal Claims seeking monetary damages resulting from the DOE's failure to accept delivery of, and provide for a permanent facility to store, spent nuclear fuel pursuant to the terms of the 1983 spent fuel and high-level waste disposal contracts between the Yankee Companies and the DOE. The court previously awarded the Yankee Companies damages for Phases I, II, III and IV of litigation resulting from the DOE's failure to meet its contractual obligations. These Phases covered damages incurred in the years 1998 through 2016, and the awarded damages have been received by the Yankee Companies with certain amounts of the damages refunded to their customers. DOE Phase V Damages - On March 25, 2021, each of the Yankee Companies filed a fifth set of lawsuits against the DOE in the Court of Federal Claims. The Yankee Companies filed claims seeking monetary damages totaling $120.4 million for CYAPC, YAEC and MYAPC, resulting from the DOE's failure to begin accepting spent nuclear fuel for disposal covering the years from 2017 to 2020 (DOE Phase V). The DOE Phase V trial is expected to begin in the third quarter of 2023. E. FERC ROE Complaints Four separate complaints were filed at the FERC by combinations of New England state attorneys general, state regulatory commissions, consumer advocates, consumer groups, municipal parties and other parties (collectively, the Complainants). In each of the first three complaints, filed on October 1, 2011, December 27, 2012, and July 31, 2014, respectively, the Complainants challenged the NETOs' base ROE of 11.14 percent that had been utilized since 2005 and sought an order to reduce it prospectively from the date of the final FERC order and for the separate 15-month complaint periods. In the fourth complaint, filed April 29, 2016, the Complainants challenged the NETOs' base ROE billed of 10.57 percent and the maximum ROE for transmission incentive (incentive cap) of 11.74 percent, asserting that these ROEs were unjust and unreasonable. The ROE originally billed during the period October 1, 2011 (beginning of the first complaint period) through October 15, 2014 consisted of a base ROE of 11.14 percent and incentives up to 13.1 percent. On October 16, 2014, FERC issued Opinion No. 531-A and set the base ROE at 10.57 percent and the incentive cap at 11.74 percent for the first complaint period. This was also effective for all prospective billings to customers beginning October 16, 2014. This FERC order was vacated on April 14, 2017 by the U.S. Court of Appeals for the D.C. Circuit (the Court). All amounts associated with the first complaint period have been refunded, which totaled $38.9 million (pre-tax and excluding interest) at Eversource and reflected both the base ROE and incentive cap prescribed by the FERC order. The refund consisted of $22.4 million for CL&P, $13.7 million for NSTAR Electric and $2.8 million for PSNH. Eversource has recorded a reserve of $39.1 million (pre-tax and excluding interest) for the second complaint period as of both September 30, 2022 and December 31, 2021. This reserve represents the difference between the billed rates during the second complaint period and a 10.57 percent base ROE and 11.74 percent incentive cap. The reserve consisted of $21.4 million for CL&P, $14.6 million for NSTAR Electric and $3.1 million for PSNH as of both September 30, 2022 and December 31, 2021. On October 16, 2018, FERC issued an order on all four complaints describing how it intends to address the issues that were remanded by the Court. FERC proposed a new framework to determine (1) whether an existing ROE is unjust and unreasonable and, if so, (2) how to calculate a replacement ROE. Initial briefs were filed by the NETOs, Complainants and FERC Trial Staff on January 11, 2019 and reply briefs were filed on March 8, 2019. The NETOs' brief was supportive of the overall ROE methodology determined in the October 16, 2018 order provided the FERC does not change the proposed methodology or alter its implementation in a manner that has a material impact on the results. The FERC order included illustrative calculations for the first complaint using FERC's proposed frameworks with financial data from that complaint. Those illustrative calculations indicated that for the first complaint period, for the NETOs, which FERC concludes are of average financial risk, the preliminary just and reasonable base ROE is 10.41 percent and the preliminary incentive cap on total ROE is 13.08 percent. If the results of the illustrative calculations were included in a final FERC order for each of the complaint periods, then a 10.41 percent base ROE and a 13.08 percent incentive cap would not have a significant impact on our financial statements for all of the complaint periods. These preliminary calculations are not binding and do not represent what we believe to be the most likely outcome of a final FERC order. On November 21, 2019, FERC issued Opinion No. 569 affecting the two pending transmission ROE complaints against the Midcontinent ISO (MISO) transmission owners, in which FERC adopted a new methodology for determining base ROEs. Various parties sought rehearing. On December 23, 2019, the NETOs filed supplementary materials in the NETOs' four pending cases to respond to this new methodology because of the uncertainty of the applicability to the NETOs' cases. On May 21, 2020, the FERC issued its order in Opinion No. 569-A on the rehearing of the MISO transmission owners' cases, in which FERC again changed its methodology for determining the MISO transmission owners' base ROEs. On November 19, 2020, the FERC issued Opinion No. 569-B denying rehearing of Opinion No. 569-A and reaffirmed the methodology previously adopted in Opinion No. 569-A. The new methodology differs significantly from the methodology proposed by FERC in its October 16, 2018 order to determine the NETOs' base ROEs in its four pending cases. FERC Opinion Nos 569-A and 569-B were appealed to the Court. On August 9, 2022, the Court issued its decision vacating MISO ROE FERC Opinions 569, 569-A and 569-B and remanded to FERC to reopen the proceedings. The Court found that FERC’s development of the new return methodology was arbitrary and capricious due to FERC’s failure to offer a reasonable explanation for its decision to reintroduce the risk-premium financial model in its new methodology for calculating a just and reasonable return. At this time, Eversource cannot predict how and when FERC will address the Court’s findings on the remand of the MISO FERC opinions or any potential associated impact on the NETOs’ four pending ROE complaint cases. Given the significant uncertainty regarding the applicability of the FERC opinions in the MISO transmission owners' two complaint cases to the NETOs' pending four complaint cases, Eversource concluded that there is no reasonable basis for a change to the reserve or recognized ROEs for any of the complaint periods at this time. As well, Eversource cannot reasonably estimate a range of loss for any of the four complaint proceedings at this time. Eversource, CL&P, NSTAR Electric and PSNH currently record revenues at the 10.57 percent base ROE and incentive cap at 11.74 percent established in the October 16, 2014 FERC order. A change of 10 basis points to the base ROE used to establish the reserves would impact Eversource's after-tax earnings by an average of approximately $3 million for each of the four 15-month complaint periods. F. Eversource and NSTAR Electric Boston Harbor Civil Action In 2016, the United States Attorney on behalf of the United States Army Corps of Engineers filed a civil action in the United States District Court for the District of Massachusetts against NSTAR Electric, HEEC, and the Massachusetts Water Resources Authority (together with NSTAR Electric and HEEC, the "Defendants"). The action alleged that the Defendants failed to comply with certain permitting requirements related to the placement of the HEEC-owned electric distribution cable beneath Boston Harbor. The parties reached a settlement pursuant to which HEEC agreed to install a new 115kV distribution cable across Boston Harbor to Deer Island, utilizing a different route, and remove portions of the existing cable. Construction of the new distribution cable was completed in August 2019, and removal of the portions of the existing cable was completed in January 2020. NSTAR Electric and HEEC continue to finalize the resolution of certain long-term environmental restoration efforts, as required under the current permit. Upon completion of these restoration efforts and subsequent resolution with the United States Army Corps of Engineers, such litigation is expected to be dismissed with prejudice. G. CL&P Regulatory Matters CL&P Tropical Storm Isaias Response Investigation: In August 2020, PURA opened a docket to investigate the preparation for and response to Tropical Storm Isaias by Connecticut utilities, including CL&P. On April 28, 2021, PURA issued a final decision on CL&P’s compliance with its emergency response plan that concluded CL&P failed to comply with certain storm performance standards and was imprudent in certain instances. Specifically, PURA concluded that CL&P did not satisfy the performance standards for managing its municipal liaison program, timely removing electrical hazards from blocked roads, communicating critical information to its customers, or meeting its obligation to secure adequate external contractor and mutual aid resources in a timely manner. Based on its findings, PURA ordered CL&P to adjust its future rates in a pending or future rate proceeding to reflect a monetary penalty in the form of a downward adjustment of 90 basis points in its allowed rate of return on equity (ROE), which is currently 9.25 percent. In its decision, PURA explained that additional monetary penalties and further enforcement orders pursuant to Connecticut statute would be considered in a separate proceeding that was initiated on May 6, 2021. On May 6, 2021, as part of the penalty proceeding, PURA issued a notice of violation that included an assessment of $30 million, consisting of a $28.4 million civil penalty for non-compliance with storm performance standards to be provided as credits on customer bills and a $1.6 million fine for violations of accident reporting requirements to be paid to the State of Connecticut’s general fund. On July 14, 2021, PURA issued a final decision in this penalty proceeding that included an assessment of $28.6 million, maintaining the $28.4 million performance penalty and reducing the $1.6 million fine for accident reporting to $0.2 million. The $28.4 million performance penalty was credited to customers on electric bills beginning on September 1, 2021 over a one-year period. The $28.4 million is the maximum statutory penalty amount under applicable Connecticut law in effect at the time of Tropical Storm Isaias, which is 2.5 percent of CL&P’s annual distribution revenues. The liability for the performance penalty was recorded as a current regulatory liability on CL&P’s balance sheet and as a reduction to Operating Revenues on the nine months ended September 30, 2021 statement of income. The after-tax earnings impact of this charge was $0.07 per share. CL&P Settlement Agreement: On October 1, 2021, CL&P entered into a settlement agreement with the DEEP, Office of Consumer Counsel (OCC), Office of the Attorney General (AG) and the Connecticut Industrial Energy Consumers, resolving certain issues that arose in then-pending regulatory proceedings initiated by the PURA. PURA approved the settlement agreement on October 27, 2021. In the settlement agreement, CL&P agreed to provide a total of $65 million of customer credits, which were distributed based on customer sales over a two-month billing period from December 1, 2021 to January 31, 2022. CL&P also agreed to irrevocably set aside $10 million in a customer assistance fund to provide bill payment assistance to certain existing non-hardship and hardship customers carrying arrearages, as approved by the PURA, with the objective of disbursing the funds prior to April 30, 2022. Those customers were provided with $10 million of bill forgiveness in the first quarter of 2022. CL&P recorded a current regulatory liability of $75 million on the balance sheet associated with the provisions of the settlement agreement, with a $65 million pre-tax charge as a reduction to Operating Revenues associated with the customer credits and a $10 million charge to Operations and Maintenance expense associated with the customer assistance fund on the September 30, 2021 statement of income. In exchange for the $75 million of customer credits and assistance, PURA’s interim rate reduction docket was resolved without findings. As a result of the settlement agreement, neither the 90 basis point reduction to CL&P’s return on equity introduced in PURA’s storm-related decision issued April 28, 2021, nor the 45 basis point reduction to CL&P’s return on equity included in PURA’s decision issued September 14, 2021 in the interim rate reduction docket, will be implemented. CL&P has also agreed to freeze its current base distribution rates, subject to the customer credits described above, until no earlier than January 1, 2024. The rate freeze applies only to base distribution rates (including storm costs) and not to other rate mechanisms such as the retail rate components, rate reconciling mechanisms, formula rates and any other adjustment mechanisms. The rate freeze also does not apply to any cost recovery mechanism outside of the base distribution rates with regard to grid-modernization initiatives or any other proceedings, either currently pending or that may be initiated during the rate freeze period, that may place additional obligations on CL&P. The approval of the settlement agreement satisfies the Connecticut statute of rate review requirements that requires electric utilities to file a distribution rate case within four years of the last rate case. As part of the settlement agreement, CL&P agreed to withdraw with prejudice its pending appeals of PURA’s decisions dated April 28, 2021 and July 14, 2021 related to Storm Isaias and agreed to waive its right to file an appeal and seek a judicial stay of the September 14, 2021 decision in the interim rate reduction docket. The settlement agreement assures that CL&P will have the opportunity to petition for and demonstrate the prudency of the storm costs incurred to respond to customer outages associated with Storm Isaias in a future ratemaking proceeding. The cumulative pre-tax impact of the settlement agreement and the Storm Isaias assessment imposed in PURA’s April 28, 2021 and July 14, 2021 decisions totaled $103.6 million, and the after-tax earnings impact was $85.8 million, or $0.25 per share, for the nine months ended September 30, 2021.

FAIR VALUE OF FINANCIAL INSTRUM

FAIR VALUE OF FINANCIAL INSTRUMENTS	9 Months Ended
FAIR VALUE OF FINANCIAL INSTRUMENTS	Sep. 30, 2022
Fair Value Disclosures [Abstract]
FAIR VALUE OF FINANCIAL INSTRUMENTS	FAIR VALUE OF FINANCIAL INSTRUMENTS The following methods and assumptions were used to estimate the fair value of each of the following financial instruments: Preferred Stock, Long-Term Debt and Rate Reduction Bonds: The fair value of CL&P's and NSTAR Electric's preferred stock is based upon pricing models that incorporate interest rates and other market factors, valuations or trades of similar securities and cash flow projections. The fair value of long-term debt and RRB debt securities is based upon pricing models that incorporate quoted market prices for those issues or similar issues adjusted for market conditions, credit ratings of the respective companies and treasury benchmark yields. The fair values provided in the table below are classified as Level 2 within the fair value hierarchy. Carrying amounts and estimated fair values are as follows: Eversource CL&P NSTAR Electric PSNH (Millions of Dollars) Carrying Fair Carrying Fair Carrying Fair Carrying Fair As of September 30, 2022: Preferred Stock Not Subject to Mandatory Redemption $ 155.6 $ 146.0 $ 116.2 $ 107.4 $ 43.0 $ 38.6 $ — $ — Long-Term Debt 21,442.4 19,010.3 4,216.2 3,774.9 4,824.8 4,415.1 1,164.4 960.1 Rate Reduction Bonds 453.7 429.5 — — — — 453.7 429.5 As of December 31, 2021: Preferred Stock Not Subject to Mandatory Redemption $ 155.6 $ 166.3 $ 116.2 $ 122.3 $ 43.0 $ 44.0 $ — $ — Long-Term Debt 18,216.7 19,636.3 4,215.4 4,848.9 3,985.4 4,453.5 1,163.8 1,220.6 Rate Reduction Bonds 496.9 543.3 — — — — 496.9 543.3 Derivative Instruments and Marketable Securities: Derivative instruments and investments in marketable securities are carried at fair value. For further information, see Note 4, "Derivative Instruments," and Note 5, "Marketable Securities," to the financial statements. See Note 1C, "Summary of Significant Accounting Policies – Fair Value Measurements," for the fair value measurement policy and the fair value hierarchy.

ACCUMULATED OTHER COMPREHENSIVE

ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS)	9 Months Ended
ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS)	Sep. 30, 2022
Equity [Abstract]
ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS)	ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) The changes in accumulated other comprehensive income/(loss) by component, net of tax, are as follows: For the Nine Months Ended September 30, 2022 For the Nine Months Ended September 30, 2021 Eversource (Millions of Dollars) Qualified Unrealized Defined Total Qualified Unrealized Defined Total Balance as of Beginning of Period $ (0.4) $ 0.4 $ (42.3) $ (42.3) $ (1.4) $ 1.1 $ (76.1) $ (76.4) OCI Before Reclassifications — (2.0) (2.5) (4.5) — (0.6) (2.4) (3.0) Amounts Reclassified from AOCI — — 5.8 5.8 1.0 — 6.5 7.5 Net OCI — (2.0) 3.3 1.3 1.0 (0.6) 4.1 4.5 Balance as of End of Period $ (0.4) $ (1.6) $ (39.0) $ (41.0) $ (0.4) $ 0.5 $ (72.0) $ (71.9) Defined benefit plan OCI amounts before reclassifications relate to actuarial gains and losses that arose during the year and were recognized in AOCI. The unamortized actuarial gains and losses and prior service costs on the defined benefit plans are amortized from AOCI into Other Income, Net over the average future employee service period, and are reflected in amounts reclassified from AOCI.

COMMON SHARES

COMMON SHARES	9 Months Ended
COMMON SHARES	Sep. 30, 2022
Equity [Abstract]
COMMON SHARES	COMMON SHARES The following table sets forth the Eversource parent common shares and the shares of common stock of CL&P, NSTAR Electric and PSNH that were authorized and issued, as well as the respective per share par values: Shares Authorized as of September 30, 2022 and December 31, 2021 Issued as of Par Value September 30, 2022 December 31, 2021 Eversource $ 5 380,000,000 359,984,073 357,818,402 CL&P $ 10 24,500,000 6,035,205 6,035,205 NSTAR Electric $ 1 100,000,000 200 200 PSNH $ 1 100,000,000 301 301 Common Share Issuances and 2022 Equity Distribution Agreement: On May 11, 2022, Eversource entered into an equity distribution agreement pursuant to which it may offer and sell up to $1.2 billion of its common shares from time to time through an “at-the-market” (ATM) equity offering program. Eversource may issue and sell its common shares through its sales agents during the term of this agreement. Shares may be offered in transactions on the New York Stock Exchange, in the over-the-counter market, through negotiated transactions or otherwise. Sales may be made at either market prices prevailing at the time of sale, at prices related to such prevailing market prices or at negotiated prices. In the first nine months of 2022, Eversource issued 2,165,671 common shares, which resulted in proceeds of $197.1 million, net of issuance costs. Eversource used the net proceeds received for general corporate purposes. Treasury Shares: As of September 30, 2022 and December 31, 2021, there were 12,635,324 and 13,415,206 Eversource common shares held as treasury shares, respectively. As of September 30, 2022 and December 31, 2021, there we re 347,348,749 and 344,403,196 Eversource common shares outstanding, respectively. Eversource issues treasury shares to satisfy awards under the Company's incentive plans, shares issued under the dividend reinvestment and share purchase plan, and matching contributions under the Eversource 401k Plan. Eversource also issued treasury shares for its December 2021 and October 2022 water business acquisitions. The issuance of treasury shares represents a non-cash transaction, as the treasury shares were used to fulfill Eversource's obligations that require the issuance of common shares. Acquisition of Torrington Water Company: On October 3, 2022, Aquarion acquired The Torrington Water Company (TWC) following the receipt of all required approvals. The acquisition was structured as a stock-for-stock exchange, and Eversource issued 925,264 treasury shares at closing for a purchase price of approximately $72 million. TWC provided regulated water service to approximately 10,100 customers in Connecticut.

COMMON SHAREHOLDERS' EQUITY AND

COMMON SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS	9 Months Ended
COMMON SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS	Sep. 30, 2022
Equity [Abstract]
COMMON SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS	COMMON SHARES The following table sets forth the Eversource parent common shares and the shares of common stock of CL&P, NSTAR Electric and PSNH that were authorized and issued, as well as the respective per share par values: Shares Authorized as of September 30, 2022 and December 31, 2021 Issued as of Par Value September 30, 2022 December 31, 2021 Eversource $ 5 380,000,000 359,984,073 357,818,402 CL&P $ 10 24,500,000 6,035,205 6,035,205 NSTAR Electric $ 1 100,000,000 200 200 PSNH $ 1 100,000,000 301 301 Common Share Issuances and 2022 Equity Distribution Agreement: On May 11, 2022, Eversource entered into an equity distribution agreement pursuant to which it may offer and sell up to $1.2 billion of its common shares from time to time through an “at-the-market” (ATM) equity offering program. Eversource may issue and sell its common shares through its sales agents during the term of this agreement. Shares may be offered in transactions on the New York Stock Exchange, in the over-the-counter market, through negotiated transactions or otherwise. Sales may be made at either market prices prevailing at the time of sale, at prices related to such prevailing market prices or at negotiated prices. In the first nine months of 2022, Eversource issued 2,165,671 common shares, which resulted in proceeds of $197.1 million, net of issuance costs. Eversource used the net proceeds received for general corporate purposes. Treasury Shares: As of September 30, 2022 and December 31, 2021, there were 12,635,324 and 13,415,206 Eversource common shares held as treasury shares, respectively. As of September 30, 2022 and December 31, 2021, there we re 347,348,749 and 344,403,196 Eversource common shares outstanding, respectively. Eversource issues treasury shares to satisfy awards under the Company's incentive plans, shares issued under the dividend reinvestment and share purchase plan, and matching contributions under the Eversource 401k Plan. Eversource also issued treasury shares for its December 2021 and October 2022 water business acquisitions. The issuance of treasury shares represents a non-cash transaction, as the treasury shares were used to fulfill Eversource's obligations that require the issuance of common shares. Acquisition of Torrington Water Company: On October 3, 2022, Aquarion acquired The Torrington Water Company (TWC) following the receipt of all required approvals. The acquisition was structured as a stock-for-stock exchange, and Eversource issued 925,264 treasury shares at closing for a purchase price of approximately $72 million. TWC provided regulated water service to approximately 10,100 customers in Connecticut.

EARNINGS PER SHARE

EARNINGS PER SHARE	9 Months Ended
EARNINGS PER SHARE	Sep. 30, 2022
Earnings Per Share [Abstract]
EARNINGS PER SHARE	EARNINGS PER SHARE Basic EPS is computed based upon the weighted average number of common shares outstanding during each period. Diluted EPS is computed on the basis of the weighted average number of common shares outstanding plus the potential dilutive effect of certain share-based compensation awards as if they were converted into outstanding common shares. The dilutive effect of unvested RSU and performance share awards is calculated using the treasury stock method. RSU and performance share awards are included in basic weighted average common shares outstanding as of the date that all necessary vesting conditions have been satisfied. For the three and nine months ended September 30, 2022 and 2021, there were no antidilutive share awards excluded from the computation of diluted EPS. The following table sets forth the components of basic and diluted EPS: Eversource (Millions of Dollars, except share information) For the Three Months Ended For the Nine Months Ended September 30, 2022 September 30, 2021 September 30, 2022 September 30, 2021 Net Income Attributable to Common Shareholders $ 349.4 $ 283.2 $ 1,084.7 $ 913.8 Weighted Average Common Shares Outstanding: Basic 347,297,411 344,023,846 346,115,823 343,848,905 Dilutive Effect 465,282 645,936 457,278 631,151 Diluted 347,762,693 344,669,782 346,573,101 344,480,056 Basic EPS $ 1.01 $ 0.82 $ 3.13 $ 2.66 Diluted EPS $ 1.00 $ 0.82 $ 3.13 $ 2.65

REVENUES

REVENUES	9 Months Ended
REVENUES	Sep. 30, 2022
Revenue from Contract with Customer [Abstract]
REVENUES	REVENUES The following tables present operating revenues disaggregated by revenue source: For the Three Months Ended September 30, 2022 Eversource (Millions of Dollars) Electric Natural Gas Electric Water Distribution Other Eliminations Total Revenues from Contracts with Customers Retail Tariff Sales Residential $ 1,492.9 $ 94.7 $ — $ 45.7 $ — $ — $ 1,633.3 Commercial 890.5 76.7 — 18.5 — (1.7) 984.0 Industrial 105.6 33.6 — 1.3 — (5.2) 135.3 Total Retail Tariff Sales Revenues 2,489.0 205.0 — 65.5 — (6.9) 2,752.6 Wholesale Transmission Revenues — — 520.3 — 29.9 (416.3) 133.9 Wholesale Market Sales Revenues 317.1 22.7 — 1.1 — — 340.9 Other Revenues from Contracts with Customers 17.3 0.6 3.4 2.1 313.6 (311.9) 25.1 Amortization of/(Reserve for) Revenues Subject to Refund (1) 7.0 — — (0.1) — — 6.9 Total Revenues from Contracts with Customers 2,830.4 228.3 523.7 68.6 343.5 (735.1) 3,259.4 Alternative Revenue Programs (37.7) (2.8) (55.1) (3.6) — 52.6 (46.6) Other Revenues (2) 2.4 0.1 0.2 0.1 — — 2.8 Total Operating Revenues $ 2,795.1 $ 225.6 $ 468.8 $ 65.1 $ 343.5 $ (682.5) $ 3,215.6 For the Nine Months Ended September 30, 2022 Eversource (Millions of Dollars) Electric Natural Gas Electric Water Distribution Other Eliminations Total Revenues from Contracts with Customers Retail Tariff Sales Residential $ 3,683.9 $ 870.0 $ — $ 109.1 $ — $ — $ 4,663.0 Commercial 2,216.0 456.9 — 49.9 — (4.2) 2,718.6 Industrial 284.1 145.2 — 3.5 — (14.8) 418.0 Total Retail Tariff Sales Revenues 6,184.0 1,472.1 — 162.5 — (19.0) 7,799.6 Wholesale Transmission Revenues — — 1,301.0 — 79.4 (1,047.3) 333.1 Wholesale Market Sales Revenues 895.2 89.3 — 2.8 — — 987.3 Other Revenues from Contracts with Customers 53.4 2.8 10.5 6.2 983.3 (974.9) 81.3 Amortization of/(Reserve for) Revenues Subject to Refund (1) 71.9 — 0.7 (0.9) — — 71.7 Total Revenues from Contracts with Customers 7,204.5 1,564.2 1,312.2 170.6 1,062.7 (2,041.2) 9,273.0 Alternative Revenue Programs (26.2) 4.3 48.9 (2.8) — (46.9) (22.7) Other Revenues (2) 7.5 0.9 0.5 0.4 — — 9.3 Total Operating Revenues $ 7,185.8 $ 1,569.4 $ 1,361.6 $ 168.2 $ 1,062.7 $ (2,088.1) $ 9,259.6 For the Three Months Ended September 30, 2021 Eversource (Millions of Dollars) Electric Natural Gas Electric Water Distribution Other Eliminations Total Revenues from Contracts with Customers Retail Tariff Sales Residential $ 1,146.8 $ 81.7 $ — $ 39.1 $ — $ — $ 1,267.6 Commercial 748.8 59.0 — 17.2 — (1.4) 823.6 Industrial 96.2 28.6 — 1.1 — (4.8) 121.1 Total Retail Tariff Sales Revenues 1,991.8 169.3 — 57.4 — (6.2) 2,212.3 Wholesale Transmission Revenues — — 527.2 — 23.0 (408.5) 141.7 Wholesale Market Sales Revenues 133.8 12.2 — 1.1 — — 147.1 Other Revenues from Contracts with Customers 29.6 1.2 3.5 1.8 303.1 (301.4) 37.8 Reserve for Revenues Subject to Refund (1) (93.4) — — (0.9) — — (94.3) Total Revenues from Contracts with Customers 2,061.8 182.7 530.7 59.4 326.1 (716.1) 2,444.6 Alternative Revenue Programs (7.9) 2.7 (112.6) 2.3 — 102.0 (13.5) Other Revenues (2) 1.3 0.1 0.2 0.1 — — 1.7 Total Operating Revenues $ 2,055.2 $ 185.5 $ 418.3 $ 61.8 $ 326.1 $ (614.1) $ 2,432.8 For the Nine Months Ended September 30, 2021 Eversource (Millions of Dollars) Electric Natural Gas Electric Water Distribution Other Eliminations Total Revenues from Contracts with Customers Retail Tariff Sales Residential $ 3,094.9 $ 722.8 $ — $ 102.8 $ — $ — $ 3,920.5 Commercial 1,902.9 356.4 — 47.0 — (4.1) 2,302.2 Industrial 261.1 119.5 — 3.3 — (12.8) 371.1 Total Retail Tariff Sales Revenues 5,258.9 1,198.7 — 153.1 — (16.9) 6,593.8 Wholesale Transmission Revenues — — 1,338.4 — 62.5 (1,075.4) 325.5 Wholesale Market Sales Revenues 380.1 54.1 — 3.0 — — 437.2 Other Revenues from Contracts with Customers 68.4 3.6 10.2 5.5 936.6 (929.6) 94.7 Reserve for Revenues Subject to Refund (1) (93.4) — — (2.2) — — (95.6) Total Revenues from Contracts with Customers 5,614.0 1,256.4 1,348.6 159.4 999.1 (2,021.9) 7,355.6 Alternative Revenue Programs 14.9 21.3 (119.2) 1.3 — 103.0 21.3 Other Revenues (2) 3.2 0.1 0.7 0.3 — — 4.3 Total Operating Revenues $ 5,632.1 $ 1,277.8 $ 1,230.1 $ 161.0 $ 999.1 $ (1,918.9) $ 7,381.2 For the Three Months Ended September 30, 2022 For the Three Months Ended September 30, 2021 (Millions of Dollars) CL&P NSTAR Electric PSNH CL&P NSTAR Electric PSNH Revenues from Contracts with Customers Retail Tariff Sales Residential $ 739.1 $ 507.6 $ 246.2 $ 572.0 $ 401.9 $ 172.9 Commercial 311.2 469.6 110.4 249.4 411.3 88.5 Industrial 41.9 39.3 24.4 35.0 35.9 25.3 Total Retail Tariff Sales Revenues 1,092.2 1,016.5 381.0 856.4 849.1 286.7 Wholesale Transmission Revenues 250.3 183.8 86.2 268.2 171.0 88.0 Wholesale Market Sales Revenues 232.9 57.5 26.7 100.3 21.3 12.2 Other Revenues from Contracts with Customers 7.5 10.7 3.1 12.1 14.3 7.3 Amortization of/(Reserve for) Revenues Subject to Refund (1) 7.0 — — (93.4) — — Total Revenues from Contracts with Customers 1,589.9 1,268.5 497.0 1,143.6 1,055.7 394.2 Alternative Revenue Programs (65.1) (20.5) (7.2) (82.0) (14.4) (24.1) Other Revenues (2) 0.2 1.8 0.6 0.2 0.7 0.6 Eliminations (155.9) (144.3) (59.8) (142.2) (123.3) (55.8) Total Operating Revenues $ 1,369.1 $ 1,105.5 $ 430.6 $ 919.6 $ 918.7 $ 314.9 For the Nine Months Ended September 30, 2022 For the Nine Months Ended September 30, 2021 (Millions of Dollars) CL&P NSTAR Electric PSNH CL&P NSTAR Electric PSNH Revenues from Contracts with Customers Retail Tariff Sales Residential $ 1,864.4 $ 1,239.0 $ 580.5 $ 1,558.6 $ 1,069.0 $ 467.3 Commercial 808.7 1,128.8 280.5 679.3 975.7 249.2 Industrial 111.4 104.0 68.7 100.2 89.5 71.4 Total Retail Tariff Sales Revenues 2,784.5 2,471.8 929.7 2,338.1 2,134.2 787.9 Wholesale Transmission Revenues 575.2 512.7 213.1 652.8 478.2 207.4 Wholesale Market Sales Revenues 656.3 163.1 75.8 278.1 64.7 37.3 Other Revenues from Contracts with Customers 22.8 34.1 8.8 28.8 36.8 14.9 Amortization of/(Reserve for) Revenues Subject to Refund (1) 72.6 — — (93.4) — — Total Revenues from Contracts with Customers 4,111.4 3,181.7 1,227.4 3,204.4 2,713.9 1,047.5 Alternative Revenue Programs 28.3 (14.4) 8.8 (74.2) (11.3) (18.8) Other Revenues (2) 0.5 5.4 2.1 0.3 2.5 1.1 Eliminations (449.6) (420.4) (161.2) (394.0) (362.0) (142.6) Total Operating Revenues $ 3,690.6 $ 2,752.3 $ 1,077.1 $ 2,736.5 $ 2,343.1 $ 887.2 (1) Amortization of Revenues Subject to Refund within the Electric Distribution segment in the third quarter and first nine months of 2022 primarily represents the reversal of a 2021 reserve at CL&P established to provide bill credits to customers as a result of the settlement agreement on October 1, 2021 and a storm performance penalty assessed by PURA. The reserve was reversed as customer credits were distributed to CL&P’s customers in retail electric rates. Total customer credits as a result of the 2021 settlement and civil penalty were $93.4 million. The settlement amount of $65 million was refunded over a two-month billing period from December 1, 2021 to January 31, 2022 and the civil penalty of $28.4 million was refunded over a one year billing period, which began September 1, 2021. Other Revenues also include lease revenues under lessor accounting guidance

SEGMENT INFORMATION

SEGMENT INFORMATION	9 Months Ended
SEGMENT INFORMATION	Sep. 30, 2022
Segment Reporting [Abstract]
SEGMENT INFORMATION	SEGMENT INFORMATION Eversource is organized into the Electric Distribution, Electric Transmission, Natural Gas Distribution and Water Distribution reportable segments and Other based on a combination of factors, including the characteristics of each segments' services, the sources of operating revenues and expenses and the regulatory environment in which each segment operates. These reportable segments represent substantially all of Eversource's total consolidated revenues. Revenues from the sale of electricity, natural gas and water primarily are derived from residential, commercial and industrial customers and are not dependent on any single customer. The Electric Distribution reportable segment includes the results of NSTAR Electric's solar power facilities. Eversource's reportable segments are determined based upon the level at which Eversource's chief operating decision maker assesses performance and makes decisions about the allocation of company resources. The remainder of Eversource's operations is presented as Other in the tables below and primarily consists of 1) the equity in earnings of Eversource parent from its subsidiaries and intercompany interest income, both of which are eliminated in consolidation, and interest expense related to the debt of Eversource parent, 2) the revenues and expenses of Eversource Service, most of which are eliminated in consolidation, 3) the operations of CYAPC and YAEC, 4) the results of other unregulated subsidiaries, which are not part of its core business, and 5) Eversource parent's equity ownership interests that are not consolidated, which primarily include the offshore wind business, a natural gas pipeline owned by Enbridge, Inc., and a renewable energy investment fund. In the ordinary course of business, Yankee Gas, NSTAR Gas and EGMA purchase natural gas transmission services from the Enbridge, Inc. natural gas pipeline project described above. These affiliate transaction costs total $77.7 million annually and are classified as Purchased Power, Fuel and Transmission on the Eversource statements of income. Each of Eversource's subsidiaries, including CL&P, NSTAR Electric and PSNH, has one reportable segment. Cash flows used for investments in plant included in the segment information below are cash capital expenditures that do not include amounts incurred but not paid, cost of removal, AFUDC related to equity funds, and the capitalized portions of pension and PBOP expense. Eversource's segment information is as follows: For the Three Months Ended September 30, 2022 Eversource (Millions of Dollars) Electric Natural Gas Electric Water Distribution Other Eliminations Total Operating Revenues $ 2,795.1 $ 225.6 $ 468.8 $ 65.1 $ 343.5 $ (682.5) $ 3,215.6 Depreciation and Amortization (256.9) (25.1) (85.1) (12.7) (35.4) 1.8 (413.4) Other Operating Expenses (2,261.5) (226.3) (143.7) (28.8) (265.7) 681.1 (2,244.9) Operating Income/(Loss) $ 276.7 $ (25.8) $ 240.0 $ 23.6 $ 42.4 $ 0.4 $ 557.3 Interest Expense $ (64.5) $ (18.8) $ (36.6) $ (8.7) $ (69.6) $ 20.0 $ (178.2) Other Income, Net 59.6 11.1 10.1 2.1 429.9 (423.0) 89.8 Net Income/(Loss) Attributable to Common 225.1 (24.6) 155.8 16.7 379.0 (402.6) 349.4 For the Nine Months Ended September 30, 2022 Eversource (Millions of Dollars) Electric Distribution Natural Gas Distribution Electric Transmission Water Distribution Other Eliminations Total Operating Revenues $ 7,185.8 $ 1,569.4 $ 1,361.6 $ 168.2 $ 1,062.7 $ (2,088.1) $ 9,259.6 Depreciation and Amortization (806.7) (116.2) (250.3) (37.5) (98.8) 5.1 (1,304.4) Other Operating Expenses (5,743.2) (1,244.3) (414.3) (82.9) (876.5) 2,081.9 (6,279.3) Operating Income $ 635.9 $ 208.9 $ 697.0 $ 47.8 $ 87.4 $ (1.1) $ 1,675.9 Interest Expense $ (184.2) $ (51.2) $ (107.3) $ (25.2) $ (169.9) $ 46.3 $ (491.5) Other Income, Net 160.1 31.9 28.3 6.4 1,280.1 (1,251.5) 255.3 Net Income Attributable to Common Shareholders 495.0 147.2 455.8 29.4 1,163.6 (1,206.3) 1,084.7 Cash Flows Used for Investments in Plant 823.9 424.5 823.3 103.4 177.6 — 2,352.7 For the Three Months Ended September 30, 2021 Eversource (Millions of Dollars) Electric Natural Gas Electric Water Distribution Other Eliminations Total Operating Revenues $ 2,055.2 $ 185.5 $ 418.3 $ 61.8 $ 326.1 $ (614.1) $ 2,432.8 Depreciation and Amortization (179.8) (28.5) (75.4) (11.5) (28.0) 1.1 (322.1) Other Operating Expenses (1,640.5) (176.9) (122.4) (26.1) (275.2) 613.7 (1,627.4) Operating Income/(Loss) $ 234.9 $ (19.9) $ 220.5 $ 24.2 $ 22.9 $ 0.7 $ 483.3 Interest Expense $ (61.0) $ (15.7) $ (33.5) $ (8.0) $ (42.5) $ 12.7 $ (148.0) Other Income, Net 25.4 6.7 5.0 1.2 325.9 (320.4) 43.8 Net Income/(Loss) Attributable to Common 150.4 (22.0) 139.4 17.5 304.9 (307.0) 283.2 For the Nine Months Ended September 30, 2021 Eversource (Millions of Dollars) Electric Natural Gas Electric Water Distribution Other Eliminations Total Operating Revenues $ 5,632.1 $ 1,277.8 $ 1,230.1 $ 161.0 $ 999.1 $ (1,918.9) $ 7,381.2 Depreciation and Amortization (534.1) (108.7) (223.4) (34.3) (83.7) 3.1 (981.1) Other Operating Expenses (4,531.3) (970.6) (359.6) (76.7) (860.3) 1,918.9 (4,879.6) Operating Income $ 566.7 $ 198.5 $ 647.1 $ 50.0 $ 55.1 $ 3.1 $ 1,520.5 Interest Expense $ (175.4) $ (44.2) $ (98.7) $ (24.0) $ (125.9) $ 37.0 $ (431.2) Other Income, Net 76.0 15.2 17.3 3.1 1,059.2 (1,046.2) 124.6 Net Income Attributable to Common Shareholders 365.4 129.6 412.4 30.0 982.5 (1,006.1) 913.8 Cash Flows Used for Investments in Plant 764.9 506.4 691.0 91.2 157.6 — 2,211.1 The following table summarizes Eversource's segmented total assets: Eversource (Millions of Dollars) Electric Natural Gas Electric Water Distribution Other Eliminations Total As of September 30, 2022 $ 26,992.6 $ 7,692.6 $ 13,225.3 $ 2,627.9 $ 24,865.4 $ (23,804.4) $ 51,599.4 As of December 31, 2021 25,411.2 7,215.9 12,377.8 2,551.1 22,674.7 (21,738.6) 48,492.1

SUMMARY OF SIGNIFICANT ACCOUN_2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	9 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	Sep. 30, 2022
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation Eversource Energy is a public utility holding company primarily engaged, through its wholly-owned regulated utility subsidiaries, in the energy delivery business. Eversource Energy's wholly-owned regulated utility subsidiaries consist of CL&P, NSTAR Electric and PSNH (electric utilities), Yankee Gas, NSTAR Gas and EGMA (natural gas utilities), and Aquarion (water utilities). Eversource provides energy delivery and/or water service to approximately 4.4 million electric, natural gas and water customers through twelve regulated utilities in Connecticut, Massachusetts and New Hampshire. The unaudited condensed consolidated financial statements of Eversource, NSTAR Electric and PSNH include the accounts of each of their respective subsidiaries. Intercompany transactions have been eliminated in consolidation. The accompanying unaudited condensed consolidated financial statements of Eversource, NSTAR Electric and PSNH and the unaudited condensed financial statements of CL&P are herein collectively referred to as the "financial statements." The combined notes to the financial statements have been prepared pursuant to the rules and regulations of the SEC. Certain information and footnote disclosures included in annual financial statements prepared in accordance with GAAP have been omitted pursuant to such rules and regulations. The accompanying financial statements should be read in conjunction with the Combined Notes to Financial Statements included in Item 8, "Financial Statements and Supplementary Data," of the Eversource 2021 Form 10-K, which was filed with the SEC on February 17, 2022. The preparation of the financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent liabilities as of the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. The financial statements contain, in the opinion of management, all adjustments (including normal, recurring adjustments) necessary to present fairly Eversource's, CL&P's, NSTAR Electric's and PSNH's financial position as of September 30, 2022 and December 31, 2021, and the results of operations, comprehensive income and common shareholders' equity for the three and nine months ended September 30, 2022 and 2021 and the cash flows for the nine months ended September 30, 2022 and 2021. The results of operations and comprehensive income for the three and nine months ended September 30, 2022 and 2021 and the cash flows for the nine months ended September 30, 2022 and 2021 are not necessarily indicative of the results expected for a full year. CYAPC and YAEC are inactive regional nuclear power companies engaged in the long-term storage of their spent nuclear fuel. Eversource consolidates the operations of CYAPC and YAEC because CL&P's, NSTAR Electric's and PSNH's combined ownership and voting interests in each of these entities is greater than 50 percent. Intercompany transactions between CL&P, NSTAR Electric, PSNH and the CYAPC and YAEC companies have been eliminated in consolidation of the Eversource financial statements. Eversource holds several equity ownership interests that are not consolidated and are accounted for under the equity method. Eversource's utility subsidiaries' electric, natural gas and water distribution and transmission businesses are subject to rate-regulation that is based on cost recovery and meets the criteria for application of accounting guidance for entities with rate-regulated operations, which considers the effect of regulation on the differences in the timing of the recognition of certain revenues and expenses from those of other businesses and industries. See Note 2, "Regulatory Accounting," for further information. Certain reclassifications of prior period data were made in the accompanying financial statements to conform to the current period presentation.
Allowance for Uncollectible Accounts	Allowance for Uncollectible Accounts Receivables, Net on the balance sheets primarily includes trade receivables from retail customers and customers related to wholesale transmission contracts, wholesale market sales, sales of RECs, and property rentals. Receivables, Net also includes customer receivables for the purchase of electricity from a competitive third party supplier, the current portion of customer energy efficiency loans, property damage receivables and other miscellaneous receivables. There is no material concentration of receivables. Receivables are recorded at amortized cost, net of a credit loss provision (or allowance for uncollectible accounts). Receivables are presented net of expected credit losses at estimated net realizable value by maintaining an allowance for uncollectible accounts. The current expected credit loss (CECL) model is applied to receivables for purposes of calculating the allowance for uncollectible accounts. This model is based on expected losses and results in the recognition of estimated expected credit losses, including uncollectible amounts for both billed and unbilled revenues, over the life of the receivable at the time a receivable is recorded. The allowance for uncollectible accounts is determined based upon a variety of judgments and factors, including an aging-based quantitative assessment that applies an estimated uncollectible percentage to each receivable aging category. Factors in determining credit loss include historical collection, write-off experience, analysis of delinquency statistics, and management's assessment of collectability from customers, including current conditions, customer payment trends, the impact on customer bills because of energy usage trends and changes in rates, flexible payment plans and financial hardship arrearage management programs being offered to customers, reasonable forecasts, and expectations of future collectability and collection efforts. Management continuously assesses the collectability of receivables and adjusts estimates based on actual experience and future expectations based on economic conditions, collection efforts and other factors. Management also monitors the aging analysis of receivables to determine if there are changes in the collections of accounts receivable. Receivable balances are written off against the allowance for uncollectible accounts when the customer accounts are no longer in service and these balances are deemed to be uncollectible. Management concluded that the reserve balance as of September 30, 2022 adequately reflected the collection risk and net realizable value for its receivables. As of September 30, 2022 and December 31, 2021, the total amount incurred as a result of COVID-19 included in the allowance for uncollectible accounts was $55.5 million and $55.3 million at Eversource, $19.7 million and $23.9 million at CL&P, and $4.1 million and $9.0 million at NSTAR Electric, respectively. At our Connecticut and Massachusetts utilities, the COVID-19 related uncollectible amounts were deferred either as incremental regulatory costs or deferred through existing regulatory tracking mechanisms that recover uncollectible energy supply costs, as management believes it is probable that these costs will ultimately be recovered from customers in future rates. No COVID-19 related uncollectible amounts were deferred at PSNH as a result of a July 2021 NHPUC order. Based on the status of our COVID-19 regulatory dockets, policies and practices in the jurisdictions in which we operate, we believe the state regulatory commissions in Connecticut and Massachusetts will allow us to recover our incremental uncollectible customer receivable costs associated with COVID-19. The PURA allows CL&P and Yankee Gas to accelerate the recovery of accounts receivable balances attributable to qualified customers under financial or medical duress (uncollectible hardship accounts receivable) outstanding for greater than 180 days and 90 days, respectively. The DPU allows NSTAR Electric, NSTAR Gas and EGMA to recover in rates amounts associated with certain uncollectible hardship accounts receivable. These uncollectible hardship customer account balances are included in Regulatory Assets or Other Long-Term Assets on the balance sheets. Hardship customers are protected from shut-off in certain circumstances, and historical collection experience has reflected a higher default risk as compared to the rest of the receivable population. Management uses a higher credit risk profile for this pool of trade receivables as compared to non-hardship receivables. The allowance for uncollectible hardship accounts is included in the total uncollectible allowance balance.
Fair Value Measurements	Fair Value Measurements Fair value measurement guidance is applied to derivative contracts that are not elected or designated as "normal purchases" or "normal sales" (normal) and to the marketable securities held in trusts. Fair value measurement guidance is also applied to valuations of the investments used to calculate the funded status of pension and PBOP plans, the nonrecurring fair value measurements of nonfinancial assets such as goodwill, long-lived assets, equity method investments, AROs, and in the valuation of acquisitions. The fair value measurement guidance was also applied in estimating the fair value of preferred stock, long-term debt and RRBs. Fair Value Hierarchy: In measuring fair value, Eversource uses observable market data when available in order to minimize the use of unobservable inputs. Inputs used in fair value measurements are categorized into three fair value hierarchy levels for disclosure purposes. The entire fair value measurement is categorized based on the lowest level of input that is significant to the fair value measurement. Eversource evaluates the classification of assets and liabilities measured at fair value on a quarterly basis. The levels of the fair value hierarchy are described below: Level 1 - Inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities as of the reporting date. Active markets are those in which transactions for the asset or liability occur in sufficient frequency and volume to provide pricing information on an ongoing basis. Level 2 - Inputs are quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-derived valuations in which all significant inputs are observable. Level 3 - Quoted market prices are not available. Fair value is derived from valuation techniques in which one or more significant inputs or assumptions are unobservable. Where possible, valuation techniques incorporate observable market inputs that can be validated to external sources such as industry exchanges, including prices of energy and energy-related products. Uncategorized - Investments that are measured at net asset value are not categorized within the fair value hierarchy.
Other Taxes	Other TaxesEversource's companies that serve customers in Connecticut collect gross receipts taxes levied by the state of Connecticut from their customers. These gross receipts taxes are recorded separately with collections in Operating Revenues and with payments in Taxes Other Than Income Taxes on the statements of incomeAs agents for state and local governments, Eversource's companies that serve customers in Connecticut and Massachusetts collect certain sales taxes that are recorded on a net basis with no impact on the statements of income.

SUMMARY OF SIGNIFICANT ACCOUN_3

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)	9 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)	Sep. 30, 2022
Accounting Policies [Abstract]
Allowance for Uncollectible Accounts	The activity in the allowance for uncollectible accounts by portfolio segment as of September 30 th is as follows: Eversource CL&P NSTAR Electric PSNH (Millions of Dollars) Hardship Accounts Retail (Non-Hardship), Total Allowance Hardship Accounts Retail (Non-Hardship), Total Allowance Hardship Accounts Retail (Non-Hardship), Total Allowance Total Allowance Three Months Ended 2022 Beginning Balance $ 242.7 $ 215.1 $ 457.8 $ 152.1 $ 40.6 $ 192.7 $ 45.0 $ 55.5 $ 100.5 $ 27.3 Uncollectible Expense — 10.7 10.7 — 4.1 4.1 — 3.5 3.5 3.5 Uncollectible Costs Deferred (1) 15.6 9.4 25.0 11.3 2.0 13.3 2.8 4.0 6.8 0.1 Write-Offs (6.5) (33.2) (39.7) (5.0) (7.7) (12.7) (0.3) (12.3) (12.6) (2.3) Recoveries Collected 0.3 3.5 3.8 0.2 1.0 1.2 — 1.3 1.3 0.2 Ending Balance $ 252.1 $ 205.5 $ 457.6 $ 158.6 $ 40.0 $ 198.6 $ 47.5 $ 52.0 $ 99.5 $ 28.8 Nine Months Ended 2022 Beginning Balance $ 226.1 $ 191.3 $ 417.4 $ 144.6 $ 36.7 $ 181.3 $ 43.3 $ 53.7 $ 97.0 $ 24.3 Uncollectible Expense — 40.8 40.8 — 10.8 10.8 — 12.2 12.2 8.1 Uncollectible Costs Deferred (1) 38.0 36.7 74.7 22.3 2.0 24.3 4.9 11.8 16.7 1.2 Write-Offs (13.5) (76.3) (89.8) (9.4) (14.4) (23.8) (0.7) (30.6) (31.3) (5.4) Recoveries Collected 1.5 13.0 14.5 1.1 4.9 6.0 — 4.9 4.9 0.6 Ending Balance $ 252.1 $ 205.5 $ 457.6 $ 158.6 $ 40.0 $ 198.6 $ 47.5 $ 52.0 $ 99.5 $ 28.8 Eversource CL&P NSTAR Electric PSNH (Millions of Dollars) Hardship Accounts Retail (Non-Hardship), Total Allowance Hardship Accounts Retail (Non-Hardship), Total Allowance Hardship Accounts Retail (Non-Hardship), Total Allowance Total Allowance Three Months Ended 2021 Beginning Balance $ 210.7 $ 215.1 $ 425.8 $ 145.6 $ 43.2 $ 188.8 $ 35.9 $ 62.1 $ 98.0 $ 17.2 Uncollectible Expense — 12.0 12.0 — 3.6 3.6 — 5.1 5.1 1.2 Uncollectible Costs Deferred (1) 22.8 1.7 24.5 4.5 5.7 10.2 11.8 (3.5) 8.3 1.2 Write-Offs (3.9) (20.5) (24.4) (3.5) (5.4) (8.9) (0.1) (7.4) (7.5) (2.8) Recoveries Collected 0.3 3.5 3.8 0.2 1.6 1.8 — 1.1 1.1 0.2 Ending Balance $ 229.9 $ 211.8 $ 441.7 $ 146.8 $ 48.7 $ 195.5 $ 47.6 $ 57.4 $ 105.0 $ 17.0 Nine Months Ended 2021 Beginning Balance $ 194.8 $ 164.1 $ 358.9 $ 129.1 $ 28.3 $ 157.4 $ 39.7 $ 51.9 $ 91.6 $ 17.2 Uncollectible Expense — 39.7 39.7 — 10.2 10.2 — 12.5 12.5 4.4 Uncollectible Costs Deferred (1) 44.8 53.3 98.1 25.7 21.4 47.1 8.3 11.8 20.1 2.0 Write-Offs (10.6) (55.2) (65.8) (8.7) (14.8) (23.5) (0.4) (22.6) (23.0) (7.3) Recoveries Collected 0.9 9.9 10.8 0.7 3.6 4.3 — 3.8 3.8 0.7 Ending Balance $ 229.9 $ 211.8 $ 441.7 $ 146.8 $ 48.7 $ 195.5 $ 47.6 $ 57.4 $ 105.0 $ 17.0 (1) These expected credit losses are deferred as regulatory costs on the balance sheets, as these amounts are ultimately recovered in rates. Amounts include uncollectible costs for hardship accounts and other customer receivables, including uncollectible amounts related to uncollectible energy supply costs and COVID-19.
Components of Other Income, Net	The components of Other Income, Net on the statements of income were as follows: For the Three Months Ended September 30, 2022 September 30, 2021 (Millions of Dollars) Eversource CL&P NSTAR Electric PSNH Eversource CL&P NSTAR Electric PSNH Pension, SERP and PBOP Non-Service $ 55.3 $ 16.2 $ 21.6 $ 6.8 $ 21.7 $ 4.2 $ 10.1 $ 2.5 AFUDC Equity 12.6 3.7 6.5 0.7 10.3 1.7 6.2 0.3 Equity in Earnings of Unconsolidated Affiliates 3.8 — 0.1 — 4.9 — 0.1 — Investment Income/(Loss) 1.3 0.2 0.4 0.2 (0.6) (0.3) (0.2) (0.1) Interest Income 14.1 1.8 9.2 0.4 7.3 1.3 3.9 0.4 Gain on Sale of Property 2.5 — — — — — — — Other 0.2 — 0.1 — 0.2 — 0.1 0.1 Total Other Income, Net $ 89.8 $ 21.9 $ 37.9 $ 8.1 $ 43.8 $ 6.9 $ 20.2 $ 3.2 For the Nine Months Ended September 30, 2022 September 30, 2021 (Millions of Dollars) Eversource CL&P NSTAR Electric PSNH Eversource CL&P NSTAR Electric PSNH Pension, SERP and PBOP Non-Service $ 164.5 $ 48.3 $ 64.0 $ 20.1 $ 63.9 $ 11.2 $ 30.3 $ 7.9 AFUDC Equity 33.7 9.3 17.5 1.7 28.7 5.1 18.6 1.2 Equity in Earnings of Unconsolidated Affiliates (1) 20.8 — 0.2 — 13.3 — 0.3 — Investment Income/(Loss) 2.4 (0.9) 0.6 0.5 0.7 1.2 0.6 0.3 Interest Income 30.3 4.6 18.8 1.1 17.2 4.1 8.8 2.0 Gain on Sale of Property 2.7 — — — 0.1 — — 0.1 Other 0.9 — 0.3 — 0.7 0.1 0.3 0.1 Total Other Income, Net $ 255.3 $ 61.3 $ 101.4 $ 23.4 $ 124.6 $ 21.7 $ 58.9 $ 11.6 (1)
Investments in Unconsolidated Affiliates	Eversource's investments included the following: (Millions of Dollars) Ownership Interest As of September 30, 2022 As of December 31, 2021 Offshore Wind Business - North East Offshore 50 % $ 1,823.5 $ 1,213.6 Natural Gas Pipeline - Algonquin Gas Transmission, LLC 15 % 119.6 121.9 Renewable Energy Investment Fund 90 % 84.5 76.5 Other various 25.8 24.3 Total Investments in Unconsolidated Affiliates $ 2,053.4 $ 1,436.3
Other Taxes	These gross receipts taxes are recorded separately with collections in Operating Revenues and with payments in Taxes Other Than Income Taxes on the statements of income as follows: For the Three Months Ended For the Nine Months Ended (Millions of Dollars) September 30, 2022 September 30, 2021 September 30, 2022 September 30, 2021 Eversource $ 52.9 $ 49.4 $ 146.0 $ 137.9 CL&P 49.2 46.1 126.0 120.7
Non-cash Investing Activities	Non-cash investing activities include plant additions included in Accounts Payable as follows: (Millions of Dollars) As of September 30, 2022 As of September 30, 2021 Eversource $ 394.1 $ 359.6 CL&P 96.7 75.3 NSTAR Electric 94.5 94.2 PSNH 49.7 32.8
Reconciliation of Cash Balances to Cash and Restricted Cash	The following table reconciles cash and cash equivalents as reported on the balance sheets to the cash, cash equivalents and restricted cash balance as reported on the statements of cash flows: As of September 30, 2022 As of December 31, 2021 (Millions of Dollars) Eversource CL&P NSTAR Electric PSNH Eversource CL&P NSTAR Electric PSNH Cash and Cash Equivalents as reported on the Balance Sheets $ 485.7 $ 14.3 $ 453.6 $ 2.2 $ 66.8 $ 55.8 $ 0.7 $ — Restricted cash included in: Special Deposits 76.5 8.7 17.3 18.7 78.2 18.7 17.4 31.4 Marketable Securities 20.8 0.1 — 0.1 31.3 0.3 0.1 0.5 Other Long-Term Assets 19.3 — — 3.2 44.7 — — 3.2 Cash, Cash Equivalents and Restricted Cash as reported on the Statements of Cash Flows $ 602.3 $ 23.1 $ 470.9 $ 24.2 $ 221.0 $ 74.8 $ 18.2 $ 35.1

REGULATORY ACCOUNTING (Tables)

REGULATORY ACCOUNTING (Tables)	9 Months Ended
REGULATORY ACCOUNTING (Tables)	Sep. 30, 2022
Regulated Operations [Abstract]
Components of Regulatory Assets	The components of regulatory assets were as follows: As of September 30, 2022 As of December 31, 2021 (Millions of Dollars) Eversource CL&P NSTAR PSNH Eversource CL&P NSTAR PSNH Benefit Costs $ 1,408.9 $ 263.3 $ 389.0 $ 114.6 $ 1,481.0 $ 272.4 $ 395.5 $ 118.9 Storm Costs, Net 1,243.9 722.5 459.9 61.5 1,102.7 695.6 341.3 65.8 Regulatory Tracking Mechanisms 941.2 214.4 339.0 70.4 1,050.5 333.6 376.6 85.4 Income Taxes, Net 808.5 480.0 114.5 17.4 790.7 470.5 112.6 17.5 Securitized Stranded Costs 446.5 — — 446.5 478.9 — — 478.9 Goodwill-related 285.2 — 244.8 — 297.8 — 255.7 — Derivative Liabilities 195.9 195.9 — — 249.2 249.2 — — Asset Retirement Obligations 124.3 35.3 66.0 4.3 115.0 33.6 59.8 4.1 Other Regulatory Assets 248.0 27.1 32.0 14.1 150.0 29.9 37.7 15.8 Total Regulatory Assets 5,702.4 1,938.5 1,645.2 728.8 5,715.8 2,084.8 1,579.2 786.4 Less: Current Portion 1,143.6 305.6 387.3 110.1 1,129.1 371.6 444.0 107.2 Total Long-Term Regulatory Assets $ 4,558.8 $ 1,632.9 $ 1,257.9 $ 618.7 $ 4,586.7 $ 1,713.2 $ 1,135.2 $ 679.2
Components of Regulatory Liabilities	The components of regulatory liabilities were as follows: As of September 30, 2022 As of December 31, 2021 (Millions of Dollars) Eversource CL&P NSTAR PSNH Eversource CL&P NSTAR PSNH EDIT due to Tax Cuts and Jobs Act of 2017 $ 2,629.0 $ 986.1 $ 952.6 $ 350.0 $ 2,685.2 $ 996.1 $ 984.5 $ 359.2 Cost of Removal 654.5 122.4 418.3 19.3 649.6 100.1 381.0 17.2 Regulatory Tracking Mechanisms 957.4 455.7 326.2 165.1 448.4 182.0 185.1 107.0 Deferred Portion of Non-Service Income 240.3 28.9 127.5 25.3 148.3 12.0 90.7 14.9 Benefit Costs 110.9 — 88.1 — 133.5 — 107.4 — AFUDC - Transmission 93.1 46.4 46.7 — 81.0 43.2 37.8 — CL&P Settlement Agreement and Storm — — — — 81.3 81.3 — — Other Regulatory Liabilities 204.6 38.6 4.4 6.7 241.4 45.1 0.8 3.3 Total Regulatory Liabilities 4,889.8 1,678.1 1,963.8 566.4 4,468.7 1,459.8 1,787.3 501.6 Less: Current Portion 988.7 434.5 368.0 185.1 602.4 266.5 228.2 120.2 Total Long-Term Regulatory Liabilities $ 3,901.1 $ 1,243.6 $ 1,595.8 $ 381.3 $ 3,866.3 $ 1,193.3 $ 1,559.1 $ 381.4

PROPERTY, PLANT AND EQUIPMENT_2

PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION (Tables)	9 Months Ended
	Sep. 30, 2022
Property, Plant and Equipment [Abstract]
Summary of Property, Plant, and Equipment	The following tables summarize property, plant and equipment by asset category: Eversource As of September 30, 2022 As of December 31, 2021 (Millions of Dollars) Distribution - Electric $ 18,132.2 $ 17,679.1 Distribution - Natural Gas 7,020.1 6,694.8 Transmission - Electric 13,371.2 12,882.4 Distribution - Water 1,971.1 1,900.9 Solar 200.9 200.9 Utility 40,695.5 39,358.1 Other (1) 1,663.4 1,469.5 Property, Plant and Equipment, Gross 42,358.9 40,827.6 Less: Accumulated Depreciation Utility (9,070.0) (8,885.2) Other (672.9) (580.1) Total Accumulated Depreciation (9,742.9) (9,465.3) Property, Plant and Equipment, Net 32,616.0 31,362.3 Construction Work in Progress 2,413.5 2,015.4 Total Property, Plant and Equipment, Net $ 35,029.5 $ 33,377.7 As of September 30, 2022 As of December 31, 2021 (Millions of Dollars) CL&P NSTAR PSNH CL&P NSTAR PSNH Distribution - Electric $ 7,297.2 $ 8,329.1 $ 2,546.2 $ 7,117.6 $ 8,105.5 $ 2,496.2 Transmission - Electric 6,022.8 5,243.3 2,106.8 5,859.0 5,090.5 1,934.6 Solar — 200.9 — — 200.9 — Property, Plant and Equipment, Gross 13,320.0 13,773.3 4,653.0 12,976.6 13,396.9 4,430.8 Less: Accumulated Depreciation (2,571.5) (3,322.3) (908.2) (2,572.1) (3,227.3) (908.4) Property, Plant and Equipment, Net 10,748.5 10,451.0 3,744.8 10,404.5 10,169.6 3,522.4 Construction Work in Progress 478.2 914.2 172.8 399.0 707.0 134.1 Total Property, Plant and Equipment, Net $ 11,226.7 $ 11,365.2 $ 3,917.6 $ 10,803.5 $ 10,876.6 $ 3,656.5 (1) These assets are primarily comprised of computer software, hardware and equipment at Eversource Service and buildings at The Rocky River Realty Company.

DERIVATIVE INSTRUMENTS (Tables)

DERIVATIVE INSTRUMENTS (Tables)	9 Months Ended
DERIVATIVE INSTRUMENTS (Tables)	Sep. 30, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Gross Fair Values and Net Amounts of Contracts	The following table presents the gross fair values of contracts, categorized by risk type, and the net amounts recorded as current or long-term derivative assets or liabilities: As of September 30, 2022 As of December 31, 2021 CL&P (Millions of Dollars) Fair Value Hierarchy Commodity Supply and Price Risk Netting (1) Net Amount Commodity Supply and Price Risk Netting (1) Net Amount Current Derivative Assets Level 3 $ 15.7 $ (0.5) $ 15.2 $ 14.7 $ (1.0) $ 13.7 Long-Term Derivative Assets Level 3 32.8 (1.0) 31.8 46.9 (0.9) 46.0 Current Derivative Liabilities Level 3 (78.6) — (78.6) (73.5) — (73.5) Long-Term Derivative Liabilities Level 3 (164.3) — (164.3) (235.4) — (235.4) (1) Amounts represent derivative assets and liabilities that Eversource elected to record net on the balance sheets. These amounts are subject to master netting agreements or similar agreements for which the right of offset exists.
Summary of Level 3 Derivative Contracts and Significant Unobservable Inputs Used	The following is a summary of the significant unobservable inputs utilized in the valuations of the derivative contracts classified as Level 3: As of September 30, 2022 As of December 31, 2021 CL&P Range Average Period Covered Range Average Period Covered Forward Reserve Prices $ 0.44 — $0.50 $ 0.47 per kW-Month 2023 - 2024 $ 0.50 — $1.15 $ 0.82 per kW-Month 2022 - 2024
Changes in the Level 3 Category of Derivative Assets Measured at Fair Value on a Recurring Basis	The following table presents changes in the Level 3 category of derivative assets and derivative liabilities measured at fair value on a recurring basis. The derivative assets and liabilities are presented on a net basis. CL&P For the Three Months Ended September 30, For the Nine Months Ended September 30, (Millions of Dollars) 2022 2021 2022 2021 Derivatives, Net: Fair Value as of Beginning of Period $ (213.3) $ (279.7) $ (249.2) $ (293.1) Net Realized/Unrealized Gains/(Losses) Included in Regulatory Assets 2.4 0.7 11.2 (10.9) Settlements 15.0 13.7 42.1 38.7 Fair Value as of End of Period $ (195.9) $ (265.3) $ (195.9) $ (265.3)

MARKETABLE SECURITIES (Tables)

MARKETABLE SECURITIES (Tables)	9 Months Ended
MARKETABLE SECURITIES (Tables)	Sep. 30, 2022
Investments, Debt and Equity Securities [Abstract]
Summary of Available-for-Sale Debt Securities	The following is a summary of the available-for-sale debt securities: As of September 30, 2022 As of December 31, 2021 Eversource (Millions of Dollars) Amortized Cost Pre-Tax Pre-Tax Fair Value Amortized Cost Pre-Tax Pre-Tax Fair Value Debt Securities $ 205.4 $ 0.2 $ (15.5) $ 190.1 $ 214.5 $ 5.1 $ (0.2) $ 219.4
Contractual Maturities of Available-for-Sale Debt Securities	As of September 30, 2022, the contractual maturities of available-for-sale debt securities were as follows: Eversource (Millions of Dollars) Amortized Cost Fair Value Less than one year (1) $ 22.4 $ 22.4 One to five years 56.0 54.6 Six to ten years 40.8 36.7 Greater than ten years 86.2 76.4 Total Debt Securities $ 205.4 $ 190.1 (1) Amounts in the Less than one year category include securities in the CYAPC and YAEC spent nuclear fuel trusts, which are restricted and are classified in long-term Marketable Securities on the balance sheets.
Marketable Securities Recorded at Fair Value on a Recurring Basis by Level	The following table presents the marketable securities recorded at fair value on a recurring basis by the level in which they are classified within the fair value hierarchy: Eversource (Millions of Dollars) As of September 30, 2022 As of December 31, 2021 Level 1: Mutual Funds and Equities $ 193.4 $ 254.2 Money Market Funds 20.8 31.3 Total Level 1 $ 214.2 $ 285.5 Level 2: U.S. Government Issued Debt Securities (Agency and Treasury) $ 77.4 $ 81.3 Corporate Debt Securities 54.8 65.3 Asset-Backed Debt Securities 9.5 12.6 Municipal Bonds 13.0 12.3 Other Fixed Income Securities 14.6 16.6 Total Level 2 $ 169.3 $ 188.1 Total Marketable Securities $ 383.5 $ 473.6

SHORT-TERM AND LONG-TERM DEBT (

SHORT-TERM AND LONG-TERM DEBT (Tables)	9 Months Ended
SHORT-TERM AND LONG-TERM DEBT (Tables)	Sep. 30, 2022
Debt Disclosure [Abstract]
Borrowings Outstanding and Available under the Commercial Paper Programs	The amount of borrowings outstanding and available under the commercial paper programs were as follows: Borrowings Outstanding as of Available Borrowing Capacity as of Weighted-Average Interest Rate as of September 30, 2022 December 31, 2021 September 30, 2022 December 31, 2021 September 30, 2022 December 31, 2021 (Millions of Dollars) Eversource Parent Commercial Paper Program $ 401.5 $ 1,343.0 $ 1,598.5 $ 657.0 3.34 % 0.31 % NSTAR Electric Commercial Paper Program — 162.5 650.0 487.5 — % 0.14 %
Summary of Long-Term Debt Issuance and Repayments	The following table summarizes long-term debt issuances and repayments: (Millions of Dollars) Issuance/(Repayment) Issue Date or Repayment Date Maturity Date Use of Proceeds for Issuance/ NSTAR Electric 4.55% 2022 Debentures $ 450.0 May 2022 June 2052 Repaid short-term debt, paid capital expenditures and working capital NSTAR Electric 4.95% 2022 Debentures 400.0 September 2022 September 2052 Refinanced investments in eligible green expenditures, which were previously financed using short-term debt from October 1, 2020 through June 30, 2022 NSTAR Electric 2.375% 2012 Debentures (400.0) October 2022 October 2022 Paid at maturity Eversource Parent 2.90% Series V Senior Notes 650.0 February 2022 March 2027 Repaid Series K Senior Notes at maturity and short-term debt Eversource Parent 3.375% Series W Senior Notes 650.0 February 2022 March 2032 Repaid Series K Senior Notes at maturity and short-term debt Eversource Parent 4.20% Series X Senior Notes 900.0 June 2022 June 2024 Repaid short-term debt and paid working capital Eversource Parent 4.60% Series Y Senior Notes 600.0 June 2022 July 2027 Repaid short-term debt and paid working capital Eversource Parent 2.75% Series K Senior Notes (750.0) March 2022 March 2022 Paid at maturity Yankee Gas 8.48% Series B First Mortgage Bonds (20.0) March 2022 March 2022 Paid at maturity Yankee Gas 4.31% Series U First Mortgage Bonds 100.0 September 2022 September 2032 Repaid short-term debt, paid capital expenditures and for general corporate purposes EGMA 4.70% Series C First Mortgage Bonds 100.0 June 2022 June 2052 Repaid short-term debt, paid capital expenditures and for general corporate purposes NSTAR Gas 4.40% Series V First Mortgage Bonds 125.0 July 2022 August 2032 Repaid short-term debt, paid capital expenditures and for general corporate purposes Aquarion Water Company of New Hampshire 4.45% General Mortgage Bonds (5.0) 0 July 2022 July 2022 Paid at maturity Aquarion Water Company of Connecticut 4.69% Senior Notes 70.0 August 2022 September 2052 Repaid short-term debt

RATE REDUCTION BONDS AND VARI_2

RATE REDUCTION BONDS AND VARIABLE INTEREST ENTITIES (Tables)	9 Months Ended
	Sep. 30, 2022
Rate Reduction Bonds and Variable Interest Entity [Abstract]
Summary of the Impact of Funding on the Balance Sheets and Income Statements	The following tables summarize the impact of PSNH Funding on PSNH's balance sheets and income statements: (Millions of Dollars) PSNH Balance Sheets: As of September 30, 2022 As of December 31, 2021 Restricted Cash - Current Portion (included in Current Assets) $ 18.0 $ 31.1 Restricted Cash - Long-Term Portion (included in Other Long-Term Assets) 3.2 3.2 Securitized Stranded Cost (included in Regulatory Assets) 446.5 478.9 Other Regulatory Liabilities (included in Regulatory Liabilities) 7.9 5.4 Accrued Interest (included in Other Current Liabilities) 2.8 7.5 Rate Reduction Bonds - Current Portion 43.2 43.2 Rate Reduction Bonds - Long-Term Portion 410.5 453.7 (Millions of Dollars) PSNH Income Statements: For the Three Months Ended For the Nine Months Ended September 30, 2022 September 30, 2021 September 30, 2022 September 30, 2021 Amortization of RRB Principal (included in Amortization of Regulatory Assets, Net) $ 10.8 $ 10.8 $ 32.4 $ 32.4 Interest Expense on RRB Principal (included in Interest Expense) 4.2 4.5 12.9 13.9

PENSION BENEFITS AND POSTRETI_2

PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSION (Tables)	9 Months Ended
	Sep. 30, 2022
Postemployment Benefits [Abstract]
Components of Net Periodic Benefit Expense/(Income)	The components of net periodic benefit plan expense/(income) for the Pension, SERP and PBOP Plans, prior to amounts capitalized as Property, Plant and Equipment or deferred as regulatory assets/(liabilities) for future recovery or refund, are shown below. The service cost component of net periodic benefit plan expense/(income), less the capitalized portion, is included in Operations and Maintenance expense on the statements of income. The remaining components of net periodic benefit plan expense/(income), less the deferred portion, are included in Other Income, Net on the statements of income. Pension, SERP and PBOP expense/(income) reflected in the statements of cash flows for CL&P, NSTAR Electric and PSNH does not include intercompany allocations of net periodic benefit plan expense/(income), as these amounts are cash settled on a short-term basis. Pension and SERP PBOP For the Three Months Ended September 30, 2022 For the Three Months Ended September 30, 2022 (Millions of Dollars) Eversource CL&P NSTAR Electric PSNH Eversource CL&P NSTAR Electric PSNH Service Cost $ 17.5 $ 4.7 $ 3.4 $ 1.7 $ 2.9 $ 0.5 $ 0.5 $ 0.3 Interest Cost 38.6 7.8 8.2 4.2 5.0 0.9 1.3 0.5 Expected Return on Plan Assets (130.7) (26.5) (32.1) (14.0) (22.5) (2.8) (10.6) (1.7) Actuarial Losses, net 28.4 4.0 8.1 1.9 — — — — Prior Service Cost/(Credit) 0.4 — 0.1 — (5.4) 0.3 (4.2) 0.1 Total Net Periodic Benefit Plan Income $ (45.8) $ (10.0) $ (12.3) $ (6.2) $ (20.0) $ (1.1) $ (13.0) $ (0.8) Intercompany Income Allocations N/A $ (4.0) $ (3.2) $ (1.0) N/A $ (0.9) $ (0.9) $ (0.3) Pension and SERP PBOP For the Nine Months Ended September 30, 2022 For the Nine Months Ended September 30, 2022 (Millions of Dollars) Eversource CL&P NSTAR PSNH Eversource CL&P NSTAR PSNH Service Cost $ 52.7 $ 13.9 $ 10.4 $ 5.2 $ 8.7 $ 1.5 $ 1.5 $ 0.8 Interest Cost 115.8 23.4 24.5 12.6 15.1 2.7 3.9 1.6 Expected Return on Plan Assets (393.1) (79.6) (96.2) (42.1) (67.5) (8.4) (31.8) (5.0) Actuarial Losses, net 87.5 12.2 24.7 6.0 — — — — Prior Service Cost/(Credit) 1.1 — 0.3 — (16.2) 0.8 (12.7) 0.3 Total Net Periodic Benefit Plan Income $ (136.0) $ (30.1) $ (36.3) $ (18.3) $ (59.9) $ (3.4) $ (39.1) $ (2.3) Intercompany Income Allocations N/A $ (11.9) $ (9.3) $ (2.7) N/A $ (2.7) $ (2.7) $ (0.9) Pension and SERP PBOP For the Three Months Ended September 30, 2021 For the Three Months Ended September 30, 2021 (Millions of Dollars) Eversource CL&P NSTAR PSNH Eversource CL&P NSTAR PSNH Service Cost $ 21.5 $ 5.6 $ 4.0 $ 2.2 $ 3.3 $ 0.5 $ 0.6 $ 0.3 Interest Cost 32.5 6.7 6.7 3.7 4.3 0.8 1.1 0.4 Expected Return on Plan Assets (109.5) (21.7) (27.1) (11.9) (19.8) (2.5) (9.2) (1.6) Actuarial Loss 60.7 10.8 15.3 5.3 2.0 0.4 0.5 0.1 Prior Service Cost/(Credit) 0.3 — 0.1 — (5.3) 0.3 (4.3) 0.1 Total Net Periodic Benefit Plan Expense/(Income) $ 5.5 $ 1.4 $ (1.0) $ (0.7) $ (15.5) $ (0.5) $ (11.3) $ (0.7) Intercompany Expense/(Income) Allocations N/A $ 2.2 $ 2.4 $ 0.7 N/A $ (0.4) $ (0.5) $ (0.2) Pension and SERP PBOP For the Nine Months Ended September 30, 2021 For the Nine Months Ended September 30, 2021 (Millions of Dollars) Eversource CL&P NSTAR PSNH Eversource CL&P NSTAR PSNH Service Cost $ 64.3 $ 17.4 $ 11.9 $ 6.6 $ 10.1 $ 1.7 $ 1.8 $ 0.9 Interest Cost 97.5 20.7 20.1 10.9 12.9 2.4 3.3 1.3 Expected Return on Plan Assets (328.0) (65.0) (81.1) (35.6) (59.3) (7.7) (27.7) (4.6) Actuarial Loss 183.1 34.6 46.1 15.4 5.9 1.2 1.6 0.4 Prior Service Cost/(Credit) 1.1 — 0.3 — (15.9) 0.8 (12.7) 0.3 Total Net Periodic Benefit Plan Expense/(Income) $ 18.0 $ 7.7 $ (2.7) $ (2.7) $ (46.3) $ (1.6) $ (33.7) $ (1.7) Intercompany Expense/(Income) Allocations N/A $ 5.8 $ 6.4 $ 1.9 N/A $ (1.3) $ (1.5) $ (0.5)

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Tables)	9 Months Ended
COMMITMENTS AND CONTINGENCIES (Tables)	Sep. 30, 2022
Commitments and Contingencies Disclosure [Abstract]
Environmental Sites and Related Reserves	The number of environmental sites and related reserves for which remediation or long-term monitoring, preliminary site work or site assessment is being performed are as follows: As of September 30, 2022 As of December 31, 2021 Number of Sites Reserve Number of Sites Reserve Eversource 62 $ 121.1 61 $ 115.4 CL&P 14 14.1 14 13.9 NSTAR Electric 11 3.5 11 3.3 PSNH 9 6.2 9 6.3
Non-Cancelable Commitments under Purchase Commitment Contracts	Renewable energy contracts include non-cancelable commitments under contracts of NSTAR Electric for the purchase of energy and RECs from renewable energy facilities. NSTAR Electric (Millions of Dollars) 2022 2023 2024 2025 2026 Thereafter Total Renewable Energy $ 27.1 $ 78.3 $ 269.4 $ 315.8 $ 322.1 $ 5,812.2 $ 6,824.9
Summary of Exposure to Guarantees and Indemnifications	The following table summarizes Eversource parent's exposure to guarantees and indemnifications of its subsidiaries and affiliates to external parties, and primarily relates to its offshore wind business: As of September 30, 2022 Company (Obligor) Description Maximum Exposure Expiration Dates North East Offshore LLC Construction-related purchase agreements with third-party contractors (1) $ 759.6 (1) Sunrise Wind LLC Construction-related purchase agreements with third-party contractors (2) 288.1 2025 - 2026 Revolution Wind, LLC Construction-related purchase agreements with third-party contractors (3) 419.0 2024 - 2027 South Fork Wind, LLC Construction-related purchase agreements with third-party contractors (4) 142.7 2023 - 2026 Eversource Investment LLC Funding and indemnification obligations of North East Offshore LLC (5) 94.8 (5) South Fork Wind, LLC Power Purchase Agreement Security (6) 7.1 (6) Sunrise Wind LLC OREC capacity production (7) 2.2 (7) Bay State Wind LLC Real estate purchase 2.5 2023 South Fork Wind, LLC Transmission interconnection 1.2 — Eversource Investment LLC Letters of Credit (8) 4.3 — Various Surety bonds (9) 35.7 2022 - 2023 Eversource Service Lease payments for real estate 0.6 2024 (1) Eversource parent issued guarantees on behalf of its 50 percent-owned affiliate, North East Offshore LLC (NEO), under which Eversource parent agreed to guarantee 50 percent of NEO’s performance of obligations under certain purchase agreements with third-party contractors, in an aggregate amount not to exceed $1.3 billion with an expiration date in 2025. Eversource parent also issued a separate guarantee to Ørsted on behalf of NEO, under which Eversource parent agreed to guarantee 50 percent of NEO’s payment obligations under certain offshore wind project construction-related agreements with Ørsted in an aggregate amount not to exceed $62.5 million and expiring upon full performance of the guaranteed obligation. Any amounts paid under this guarantee to Ørsted will count toward, but not increase, the maximum amount of the Funding Guarantee described in Note 5, below. (2) Eversource parent issued guarantees on behalf of its 50 percent-owned affiliate, Sunrise Wind LLC, whereby Eversource parent will guarantee Sunrise Wind LLC's performance of certain obligations, in an aggregate amount not to exceed $461.9 million, in connection with construction-related purchase agreements. Eversource parent’s obligations under the guarantees expire upon the earlier of (i) dates ranging from March 2025 and April 2026 and (ii) full performance of the guaranteed obligations. (3) Eversource parent issued guarantees on behalf of its 50 percent-owned affiliate, Revolution Wind, LLC, whereby Eversource parent will guarantee Revolution Wind, LLC's performance of certain obligations, in an aggregate amount not to exceed $542.1 million, in connection with construction-related purchase agreements. Eversource parent’s obligations under the guarantees expire upon the earlier of (i) dates ranging from May 2024 and November 2027 and (ii) full performance of the guaranteed obligations. (4) Eversource parent issued guarantees on behalf of its 50 percent-owned affiliate, South Fork Wind, LLC, whereby Eversource parent will guarantee South Fork Wind, LLC's performance of certain obligations in connection with construction-related purchase agreements. Under these guarantees, Eversource parent will guarantee South Fork Wind, LLC's performance of certain obligations, in a total aggregate amount not to exceed $206.6 million. Eversource parent’s obligations under these guarantees expire upon the earlier of (i) dates ranging from June 2023 and August 2026 and (ii) full performance of the guaranteed obligations. (5) Eversource parent issued a guarantee (Funding Guarantee) on behalf of Eversource Investment LLC (EI), its wholly-owned subsidiary that holds a 50 percent ownership interest in NEO, under which Eversource parent agreed to guarantee certain funding obligations and certain indemnification payments of EI under the operating agreement of NEO, in an amount not to exceed $910 million. The guaranteed obligations include payment of EI's funding obligations during the construction phase of NEO’s underlying offshore wind projects and indemnification obligations associated with third party credit support for its investment in NEO. Eversource parent’s obligations under the Funding Guarantee expire upon the full performance of the guaranteed obligations. (6) Eversource parent issued a guarantee on behalf of its 50 percent-owned affiliate, South Fork Wind, LLC, whereby Eversource parent will guarantee South Fork Wind, LLC's performance of certain obligations, in an amount not to exceed $7.1 million, under a Power Purchase Agreement between the Long Island Power Authority and South Fork Wind, LLC (the Agreement). The guarantee expires upon the later of (i) the end of the Agreement term and (ii) full performance of the guarantee obligations. (7) Eversource parent issued a guarantee on behalf of its 50 percent-owned affiliate, Sunrise Wind LLC, whereby Eversource parent will guarantee Sunrise Wind LLC's performance of certain obligations, in an amount not to exceed $15.4 million, under the Offshore Wind Renewable Energy Certificate Purchase and Sale Agreement (the Agreement). The Agreement was executed by and between the New York State Energy Research and Development Authority (NYSERDA) and Sunrise Wind LLC. The guarantee expires upon the full performance of the guaranteed obligations. (8) On September 16, 2020, Eversource parent entered into a guarantee on behalf of EI, which holds Eversource's investments in offshore wind-related equity method investments, under which Eversource parent would guarantee EI's obligations under a letter of credit facility with a financial institution that EI may request in an aggregate amount of up to approximately $25 million. In January 2022, Eversource parent issued two letters of credit on behalf of South Fork Wind, LLC related to future decommissioning obligations of certain onshore transmission assets totaling $4.3 million. (9) Surety bond expiration dates reflect termination dates, the majority of which will be renewed or extended. Certain surety bonds contain credit ratings triggers that would require Eversource parent to post collateral in the event that the unsecured debt credit ratings of Eversource parent are downgraded.

FAIR VALUE OF FINANCIAL INSTR_2

FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)	9 Months Ended
FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)	Sep. 30, 2022
Fair Value Disclosures [Abstract]
Carrying Amounts and Estimated Fair Values of Financial Instruments	Carrying amounts and estimated fair values are as follows: Eversource CL&P NSTAR Electric PSNH (Millions of Dollars) Carrying Fair Carrying Fair Carrying Fair Carrying Fair As of September 30, 2022: Preferred Stock Not Subject to Mandatory Redemption $ 155.6 $ 146.0 $ 116.2 $ 107.4 $ 43.0 $ 38.6 $ — $ — Long-Term Debt 21,442.4 19,010.3 4,216.2 3,774.9 4,824.8 4,415.1 1,164.4 960.1 Rate Reduction Bonds 453.7 429.5 — — — — 453.7 429.5 As of December 31, 2021: Preferred Stock Not Subject to Mandatory Redemption $ 155.6 $ 166.3 $ 116.2 $ 122.3 $ 43.0 $ 44.0 $ — $ — Long-Term Debt 18,216.7 19,636.3 4,215.4 4,848.9 3,985.4 4,453.5 1,163.8 1,220.6 Rate Reduction Bonds 496.9 543.3 — — — — 496.9 543.3

ACCUMULATED OTHER COMPREHENSI_2

ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Tables)	9 Months Ended
ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Tables)	Sep. 30, 2022
Equity [Abstract]
Changes in Accumulated Other Comprehensive Income/(Loss) by Component, Net of Tax	The changes in accumulated other comprehensive income/(loss) by component, net of tax, are as follows: For the Nine Months Ended September 30, 2022 For the Nine Months Ended September 30, 2021 Eversource (Millions of Dollars) Qualified Unrealized Defined Total Qualified Unrealized Defined Total Balance as of Beginning of Period $ (0.4) $ 0.4 $ (42.3) $ (42.3) $ (1.4) $ 1.1 $ (76.1) $ (76.4) OCI Before Reclassifications — (2.0) (2.5) (4.5) — (0.6) (2.4) (3.0) Amounts Reclassified from AOCI — — 5.8 5.8 1.0 — 6.5 7.5 Net OCI — (2.0) 3.3 1.3 1.0 (0.6) 4.1 4.5 Balance as of End of Period $ (0.4) $ (1.6) $ (39.0) $ (41.0) $ (0.4) $ 0.5 $ (72.0) $ (71.9)

COMMON SHARES (Tables)

COMMON SHARES (Tables)	9 Months Ended
COMMON SHARES (Tables)	Sep. 30, 2022
Equity [Abstract]
Common Shares Authorized and Issued	The following table sets forth the Eversource parent common shares and the shares of common stock of CL&P, NSTAR Electric and PSNH that were authorized and issued, as well as the respective per share par values: Shares Authorized as of September 30, 2022 and December 31, 2021 Issued as of Par Value September 30, 2022 December 31, 2021 Eversource $ 5 380,000,000 359,984,073 357,818,402 CL&P $ 10 24,500,000 6,035,205 6,035,205 NSTAR Electric $ 1 100,000,000 200 200 PSNH $ 1 100,000,000 301 301

EARNINGS PER SHARE (Tables)

EARNINGS PER SHARE (Tables)	9 Months Ended
EARNINGS PER SHARE (Tables)	Sep. 30, 2022
Earnings Per Share [Abstract]
Components of Basic and Diluted EPS	The following table sets forth the components of basic and diluted EPS: Eversource (Millions of Dollars, except share information) For the Three Months Ended For the Nine Months Ended September 30, 2022 September 30, 2021 September 30, 2022 September 30, 2021 Net Income Attributable to Common Shareholders $ 349.4 $ 283.2 $ 1,084.7 $ 913.8 Weighted Average Common Shares Outstanding: Basic 347,297,411 344,023,846 346,115,823 343,848,905 Dilutive Effect 465,282 645,936 457,278 631,151 Diluted 347,762,693 344,669,782 346,573,101 344,480,056 Basic EPS $ 1.01 $ 0.82 $ 3.13 $ 2.66 Diluted EPS $ 1.00 $ 0.82 $ 3.13 $ 2.65

REVENUES (Tables)

REVENUES (Tables)	9 Months Ended
REVENUES (Tables)	Sep. 30, 2022
Revenue from Contract with Customer [Abstract]
Operating Revenues Disaggregated by Revenue Source	The following tables present operating revenues disaggregated by revenue source: For the Three Months Ended September 30, 2022 Eversource (Millions of Dollars) Electric Natural Gas Electric Water Distribution Other Eliminations Total Revenues from Contracts with Customers Retail Tariff Sales Residential $ 1,492.9 $ 94.7 $ — $ 45.7 $ — $ — $ 1,633.3 Commercial 890.5 76.7 — 18.5 — (1.7) 984.0 Industrial 105.6 33.6 — 1.3 — (5.2) 135.3 Total Retail Tariff Sales Revenues 2,489.0 205.0 — 65.5 — (6.9) 2,752.6 Wholesale Transmission Revenues — — 520.3 — 29.9 (416.3) 133.9 Wholesale Market Sales Revenues 317.1 22.7 — 1.1 — — 340.9 Other Revenues from Contracts with Customers 17.3 0.6 3.4 2.1 313.6 (311.9) 25.1 Amortization of/(Reserve for) Revenues Subject to Refund (1) 7.0 — — (0.1) — — 6.9 Total Revenues from Contracts with Customers 2,830.4 228.3 523.7 68.6 343.5 (735.1) 3,259.4 Alternative Revenue Programs (37.7) (2.8) (55.1) (3.6) — 52.6 (46.6) Other Revenues (2) 2.4 0.1 0.2 0.1 — — 2.8 Total Operating Revenues $ 2,795.1 $ 225.6 $ 468.8 $ 65.1 $ 343.5 $ (682.5) $ 3,215.6 For the Nine Months Ended September 30, 2022 Eversource (Millions of Dollars) Electric Natural Gas Electric Water Distribution Other Eliminations Total Revenues from Contracts with Customers Retail Tariff Sales Residential $ 3,683.9 $ 870.0 $ — $ 109.1 $ — $ — $ 4,663.0 Commercial 2,216.0 456.9 — 49.9 — (4.2) 2,718.6 Industrial 284.1 145.2 — 3.5 — (14.8) 418.0 Total Retail Tariff Sales Revenues 6,184.0 1,472.1 — 162.5 — (19.0) 7,799.6 Wholesale Transmission Revenues — — 1,301.0 — 79.4 (1,047.3) 333.1 Wholesale Market Sales Revenues 895.2 89.3 — 2.8 — — 987.3 Other Revenues from Contracts with Customers 53.4 2.8 10.5 6.2 983.3 (974.9) 81.3 Amortization of/(Reserve for) Revenues Subject to Refund (1) 71.9 — 0.7 (0.9) — — 71.7 Total Revenues from Contracts with Customers 7,204.5 1,564.2 1,312.2 170.6 1,062.7 (2,041.2) 9,273.0 Alternative Revenue Programs (26.2) 4.3 48.9 (2.8) — (46.9) (22.7) Other Revenues (2) 7.5 0.9 0.5 0.4 — — 9.3 Total Operating Revenues $ 7,185.8 $ 1,569.4 $ 1,361.6 $ 168.2 $ 1,062.7 $ (2,088.1) $ 9,259.6 For the Three Months Ended September 30, 2021 Eversource (Millions of Dollars) Electric Natural Gas Electric Water Distribution Other Eliminations Total Revenues from Contracts with Customers Retail Tariff Sales Residential $ 1,146.8 $ 81.7 $ — $ 39.1 $ — $ — $ 1,267.6 Commercial 748.8 59.0 — 17.2 — (1.4) 823.6 Industrial 96.2 28.6 — 1.1 — (4.8) 121.1 Total Retail Tariff Sales Revenues 1,991.8 169.3 — 57.4 — (6.2) 2,212.3 Wholesale Transmission Revenues — — 527.2 — 23.0 (408.5) 141.7 Wholesale Market Sales Revenues 133.8 12.2 — 1.1 — — 147.1 Other Revenues from Contracts with Customers 29.6 1.2 3.5 1.8 303.1 (301.4) 37.8 Reserve for Revenues Subject to Refund (1) (93.4) — — (0.9) — — (94.3) Total Revenues from Contracts with Customers 2,061.8 182.7 530.7 59.4 326.1 (716.1) 2,444.6 Alternative Revenue Programs (7.9) 2.7 (112.6) 2.3 — 102.0 (13.5) Other Revenues (2) 1.3 0.1 0.2 0.1 — — 1.7 Total Operating Revenues $ 2,055.2 $ 185.5 $ 418.3 $ 61.8 $ 326.1 $ (614.1) $ 2,432.8 For the Nine Months Ended September 30, 2021 Eversource (Millions of Dollars) Electric Natural Gas Electric Water Distribution Other Eliminations Total Revenues from Contracts with Customers Retail Tariff Sales Residential $ 3,094.9 $ 722.8 $ — $ 102.8 $ — $ — $ 3,920.5 Commercial 1,902.9 356.4 — 47.0 — (4.1) 2,302.2 Industrial 261.1 119.5 — 3.3 — (12.8) 371.1 Total Retail Tariff Sales Revenues 5,258.9 1,198.7 — 153.1 — (16.9) 6,593.8 Wholesale Transmission Revenues — — 1,338.4 — 62.5 (1,075.4) 325.5 Wholesale Market Sales Revenues 380.1 54.1 — 3.0 — — 437.2 Other Revenues from Contracts with Customers 68.4 3.6 10.2 5.5 936.6 (929.6) 94.7 Reserve for Revenues Subject to Refund (1) (93.4) — — (2.2) — — (95.6) Total Revenues from Contracts with Customers 5,614.0 1,256.4 1,348.6 159.4 999.1 (2,021.9) 7,355.6 Alternative Revenue Programs 14.9 21.3 (119.2) 1.3 — 103.0 21.3 Other Revenues (2) 3.2 0.1 0.7 0.3 — — 4.3 Total Operating Revenues $ 5,632.1 $ 1,277.8 $ 1,230.1 $ 161.0 $ 999.1 $ (1,918.9) $ 7,381.2 For the Three Months Ended September 30, 2022 For the Three Months Ended September 30, 2021 (Millions of Dollars) CL&P NSTAR Electric PSNH CL&P NSTAR Electric PSNH Revenues from Contracts with Customers Retail Tariff Sales Residential $ 739.1 $ 507.6 $ 246.2 $ 572.0 $ 401.9 $ 172.9 Commercial 311.2 469.6 110.4 249.4 411.3 88.5 Industrial 41.9 39.3 24.4 35.0 35.9 25.3 Total Retail Tariff Sales Revenues 1,092.2 1,016.5 381.0 856.4 849.1 286.7 Wholesale Transmission Revenues 250.3 183.8 86.2 268.2 171.0 88.0 Wholesale Market Sales Revenues 232.9 57.5 26.7 100.3 21.3 12.2 Other Revenues from Contracts with Customers 7.5 10.7 3.1 12.1 14.3 7.3 Amortization of/(Reserve for) Revenues Subject to Refund (1) 7.0 — — (93.4) — — Total Revenues from Contracts with Customers 1,589.9 1,268.5 497.0 1,143.6 1,055.7 394.2 Alternative Revenue Programs (65.1) (20.5) (7.2) (82.0) (14.4) (24.1) Other Revenues (2) 0.2 1.8 0.6 0.2 0.7 0.6 Eliminations (155.9) (144.3) (59.8) (142.2) (123.3) (55.8) Total Operating Revenues $ 1,369.1 $ 1,105.5 $ 430.6 $ 919.6 $ 918.7 $ 314.9 For the Nine Months Ended September 30, 2022 For the Nine Months Ended September 30, 2021 (Millions of Dollars) CL&P NSTAR Electric PSNH CL&P NSTAR Electric PSNH Revenues from Contracts with Customers Retail Tariff Sales Residential $ 1,864.4 $ 1,239.0 $ 580.5 $ 1,558.6 $ 1,069.0 $ 467.3 Commercial 808.7 1,128.8 280.5 679.3 975.7 249.2 Industrial 111.4 104.0 68.7 100.2 89.5 71.4 Total Retail Tariff Sales Revenues 2,784.5 2,471.8 929.7 2,338.1 2,134.2 787.9 Wholesale Transmission Revenues 575.2 512.7 213.1 652.8 478.2 207.4 Wholesale Market Sales Revenues 656.3 163.1 75.8 278.1 64.7 37.3 Other Revenues from Contracts with Customers 22.8 34.1 8.8 28.8 36.8 14.9 Amortization of/(Reserve for) Revenues Subject to Refund (1) 72.6 — — (93.4) — — Total Revenues from Contracts with Customers 4,111.4 3,181.7 1,227.4 3,204.4 2,713.9 1,047.5 Alternative Revenue Programs 28.3 (14.4) 8.8 (74.2) (11.3) (18.8) Other Revenues (2) 0.5 5.4 2.1 0.3 2.5 1.1 Eliminations (449.6) (420.4) (161.2) (394.0) (362.0) (142.6) Total Operating Revenues $ 3,690.6 $ 2,752.3 $ 1,077.1 $ 2,736.5 $ 2,343.1 $ 887.2 (1) Amortization of Revenues Subject to Refund within the Electric Distribution segment in the third quarter and first nine months of 2022 primarily represents the reversal of a 2021 reserve at CL&P established to provide bill credits to customers as a result of the settlement agreement on October 1, 2021 and a storm performance penalty assessed by PURA. The reserve was reversed as customer credits were distributed to CL&P’s customers in retail electric rates. Total customer credits as a result of the 2021 settlement and civil penalty were $93.4 million. The settlement amount of $65 million was refunded over a two-month billing period from December 1, 2021 to January 31, 2022 and the civil penalty of $28.4 million was refunded over a one year billing period, which began September 1, 2021. Other Revenues also include lease revenues under lessor accounting guidance

SEGMENT INFORMATION (Tables)

SEGMENT INFORMATION (Tables)	9 Months Ended
SEGMENT INFORMATION (Tables)	Sep. 30, 2022
Segment Reporting [Abstract]
Summary of Segment Information and Segmented Total Assets	Eversource's segment information is as follows: For the Three Months Ended September 30, 2022 Eversource (Millions of Dollars) Electric Natural Gas Electric Water Distribution Other Eliminations Total Operating Revenues $ 2,795.1 $ 225.6 $ 468.8 $ 65.1 $ 343.5 $ (682.5) $ 3,215.6 Depreciation and Amortization (256.9) (25.1) (85.1) (12.7) (35.4) 1.8 (413.4) Other Operating Expenses (2,261.5) (226.3) (143.7) (28.8) (265.7) 681.1 (2,244.9) Operating Income/(Loss) $ 276.7 $ (25.8) $ 240.0 $ 23.6 $ 42.4 $ 0.4 $ 557.3 Interest Expense $ (64.5) $ (18.8) $ (36.6) $ (8.7) $ (69.6) $ 20.0 $ (178.2) Other Income, Net 59.6 11.1 10.1 2.1 429.9 (423.0) 89.8 Net Income/(Loss) Attributable to Common 225.1 (24.6) 155.8 16.7 379.0 (402.6) 349.4 For the Nine Months Ended September 30, 2022 Eversource (Millions of Dollars) Electric Distribution Natural Gas Distribution Electric Transmission Water Distribution Other Eliminations Total Operating Revenues $ 7,185.8 $ 1,569.4 $ 1,361.6 $ 168.2 $ 1,062.7 $ (2,088.1) $ 9,259.6 Depreciation and Amortization (806.7) (116.2) (250.3) (37.5) (98.8) 5.1 (1,304.4) Other Operating Expenses (5,743.2) (1,244.3) (414.3) (82.9) (876.5) 2,081.9 (6,279.3) Operating Income $ 635.9 $ 208.9 $ 697.0 $ 47.8 $ 87.4 $ (1.1) $ 1,675.9 Interest Expense $ (184.2) $ (51.2) $ (107.3) $ (25.2) $ (169.9) $ 46.3 $ (491.5) Other Income, Net 160.1 31.9 28.3 6.4 1,280.1 (1,251.5) 255.3 Net Income Attributable to Common Shareholders 495.0 147.2 455.8 29.4 1,163.6 (1,206.3) 1,084.7 Cash Flows Used for Investments in Plant 823.9 424.5 823.3 103.4 177.6 — 2,352.7 For the Three Months Ended September 30, 2021 Eversource (Millions of Dollars) Electric Natural Gas Electric Water Distribution Other Eliminations Total Operating Revenues $ 2,055.2 $ 185.5 $ 418.3 $ 61.8 $ 326.1 $ (614.1) $ 2,432.8 Depreciation and Amortization (179.8) (28.5) (75.4) (11.5) (28.0) 1.1 (322.1) Other Operating Expenses (1,640.5) (176.9) (122.4) (26.1) (275.2) 613.7 (1,627.4) Operating Income/(Loss) $ 234.9 $ (19.9) $ 220.5 $ 24.2 $ 22.9 $ 0.7 $ 483.3 Interest Expense $ (61.0) $ (15.7) $ (33.5) $ (8.0) $ (42.5) $ 12.7 $ (148.0) Other Income, Net 25.4 6.7 5.0 1.2 325.9 (320.4) 43.8 Net Income/(Loss) Attributable to Common 150.4 (22.0) 139.4 17.5 304.9 (307.0) 283.2 For the Nine Months Ended September 30, 2021 Eversource (Millions of Dollars) Electric Natural Gas Electric Water Distribution Other Eliminations Total Operating Revenues $ 5,632.1 $ 1,277.8 $ 1,230.1 $ 161.0 $ 999.1 $ (1,918.9) $ 7,381.2 Depreciation and Amortization (534.1) (108.7) (223.4) (34.3) (83.7) 3.1 (981.1) Other Operating Expenses (4,531.3) (970.6) (359.6) (76.7) (860.3) 1,918.9 (4,879.6) Operating Income $ 566.7 $ 198.5 $ 647.1 $ 50.0 $ 55.1 $ 3.1 $ 1,520.5 Interest Expense $ (175.4) $ (44.2) $ (98.7) $ (24.0) $ (125.9) $ 37.0 $ (431.2) Other Income, Net 76.0 15.2 17.3 3.1 1,059.2 (1,046.2) 124.6 Net Income Attributable to Common Shareholders 365.4 129.6 412.4 30.0 982.5 (1,006.1) 913.8 Cash Flows Used for Investments in Plant 764.9 506.4 691.0 91.2 157.6 — 2,211.1 The following table summarizes Eversource's segmented total assets: Eversource (Millions of Dollars) Electric Natural Gas Electric Water Distribution Other Eliminations Total As of September 30, 2022 $ 26,992.6 $ 7,692.6 $ 13,225.3 $ 2,627.9 $ 24,865.4 $ (23,804.4) $ 51,599.4 As of December 31, 2021 25,411.2 7,215.9 12,377.8 2,551.1 22,674.7 (21,738.6) 48,492.1

SUMMARY OF SIGNIFICANT ACCOUN_4

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) customer in Millions	9 Months Ended
	Sep. 30, 2022 USD ($) regulatedUtility customer project	Jun. 30, 2022 USD ($)	May 04, 2022	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Summary of Accounting Policies [Line Items]
Investments in unconsolidated affiliates	$ 2,053,404,000				$ 1,436,293,000
Number of electric, natural gas and water customers \| customer	4.4
Allowance for uncollectible accounts for late fees and other receivable amounts	$ 457,600,000	$ 457,800,000			417,400,000	$ 441,700,000	$ 425,800,000	$ 358,900,000
Number of offshore wind projects \| project	3
Cash, cash equivalents, restricted cash and restricted cash equivalents	$ 602,256,000				$ 221,008,000	218,129,000		264,950,000
Restricted Cash, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other Long-Term Assets				Other Long-Term Assets
Energy Relief Fund - Merrimack Valley Programs
Summary of Accounting Policies [Line Items]
Restricted cash, current	$ 20,000,000
Restricted cash, noncurrent	15,900,000
Restricted cash					$ 41,500,000
COVID-19
Summary of Accounting Policies [Line Items]
Allowance for uncollectible accounts for late fees and other receivable amounts	55,500,000				55,300,000
CL&P
Summary of Accounting Policies [Line Items]
Allowance for uncollectible accounts for late fees and other receivable amounts	$ 198,600,000	192,700,000			181,300,000	195,500,000	188,800,000	157,400,000
Period of accounts receivable recoverable under financial or medical duress	180 days
Cash, cash equivalents, restricted cash and restricted cash equivalents	$ 23,120,000				74,788,000	71,762,000		99,809,000
CL&P \| Customer Assistance Fund
Summary of Accounting Policies [Line Items]
Cash, cash equivalents, restricted cash and restricted cash equivalents				$ 10,000,000	10,000,000
CL&P \| COVID-19
Summary of Accounting Policies [Line Items]
Allowance for uncollectible accounts for late fees and other receivable amounts	19,700,000				23,900,000
NSTAR Electric
Summary of Accounting Policies [Line Items]
Allowance for uncollectible accounts for late fees and other receivable amounts	99,500,000	100,500,000			97,000,000	105,000,000	98,000,000	91,600,000
Cash, cash equivalents, restricted cash and restricted cash equivalents	470,945,000				18,179,000	20,838,000		17,410,000
NSTAR Electric \| COVID-19
Summary of Accounting Policies [Line Items]
Allowance for uncollectible accounts for late fees and other receivable amounts	4,100,000				9,000,000
PSNH
Summary of Accounting Policies [Line Items]
Allowance for uncollectible accounts for late fees and other receivable amounts	28,800,000	$ 27,300,000			24,300,000	17,000,000	$ 17,200,000	17,200,000
Cash, cash equivalents, restricted cash and restricted cash equivalents	24,246,000				35,126,000	$ 26,173,000		$ 39,555,000
PSNH \| COVID-19
Summary of Accounting Policies [Line Items]
Allowance for uncollectible accounts for late fees and other receivable amounts	$ 0				$ 0
Yankee Gas
Summary of Accounting Policies [Line Items]
Period of accounts receivable recoverable under financial or medical duress	90 days
Connecticut, Massachusetts and New Hampshire
Summary of Accounting Policies [Line Items]
Number of regulated utilities \| regulatedUtility	12
Offshore Wind Business
Summary of Accounting Policies [Line Items]
Ownership interest			50%
North East Offshore LLC
Summary of Accounting Policies [Line Items]
Ownership interest	50%

SUMMARY OF SIGNIFICANT ACCOUN_5

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Provision for Uncollectible Accounts (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	$ 457,800	$ 425,800	$ 417,400	$ 358,900
Uncollectible Expense	10,700	12,000	40,753	39,690
Uncollectible Costs Deferred	25,000	24,500	74,700	98,100
Write-Offs	(39,700)	(24,400)	(89,800)	(65,800)
Recoveries Collected	3,800	3,800	14,500	10,800
Ending Balance	457,600	441,700	457,600	441,700
CL&P
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	192,700	188,800	181,300	157,400
Uncollectible Expense	4,100	3,600	10,816	10,183
Uncollectible Costs Deferred	13,300	10,200	24,300	47,100
Write-Offs	(12,700)	(8,900)	(23,800)	(23,500)
Recoveries Collected	1,200	1,800	6,000	4,300
Ending Balance	198,600	195,500	198,600	195,500
NSTAR Electric
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	100,500	98,000	97,000	91,600
Uncollectible Expense	3,500	5,100	12,159	12,477
Uncollectible Costs Deferred	6,800	8,300	16,700	20,100
Write-Offs	(12,600)	(7,500)	(31,300)	(23,000)
Recoveries Collected	1,300	1,100	4,900	3,800
Ending Balance	99,500	105,000	99,500	105,000
PSNH
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	27,300	17,200	24,300	17,200
Uncollectible Expense	3,500	1,200	8,060	4,381
Uncollectible Costs Deferred	100	1,200	1,200	2,000
Write-Offs	(2,300)	(2,800)	(5,400)	(7,300)
Recoveries Collected	200	200	600	700
Ending Balance	28,800	17,000	28,800	17,000
Hardship Accounts
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	242,700	210,700	226,100	194,800
Uncollectible Expense	0	0	0	0
Uncollectible Costs Deferred	15,600	22,800	38,000	44,800
Write-Offs	(6,500)	(3,900)	(13,500)	(10,600)
Recoveries Collected	300	300	1,500	900
Ending Balance	252,100	229,900	252,100	229,900
Hardship Accounts \| CL&P
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	152,100	145,600	144,600	129,100
Uncollectible Expense	0	0	0	0
Uncollectible Costs Deferred	11,300	4,500	22,300	25,700
Write-Offs	(5,000)	(3,500)	(9,400)	(8,700)
Recoveries Collected	200	200	1,100	700
Ending Balance	158,600	146,800	158,600	146,800
Hardship Accounts \| NSTAR Electric
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	45,000	35,900	43,300	39,700
Uncollectible Expense	0	0	0	0
Uncollectible Costs Deferred	2,800	11,800	4,900	8,300
Write-Offs	(300)	(100)	(700)	(400)
Recoveries Collected	0	0	0	0
Ending Balance	47,500	47,600	47,500	47,600
Retail (Non-Hardship), Wholesale, and Other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	215,100	215,100	191,300	164,100
Uncollectible Expense	10,700	12,000	40,800	39,700
Uncollectible Costs Deferred	9,400	1,700	36,700	53,300
Write-Offs	(33,200)	(20,500)	(76,300)	(55,200)
Recoveries Collected	3,500	3,500	13,000	9,900
Ending Balance	205,500	211,800	205,500	211,800
Retail (Non-Hardship), Wholesale, and Other \| CL&P
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	40,600	43,200	36,700	28,300
Uncollectible Expense	4,100	3,600	10,800	10,200
Uncollectible Costs Deferred	2,000	5,700	2,000	21,400
Write-Offs	(7,700)	(5,400)	(14,400)	(14,800)
Recoveries Collected	1,000	1,600	4,900	3,600
Ending Balance	40,000	48,700	40,000	48,700
Retail (Non-Hardship), Wholesale, and Other \| NSTAR Electric
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	55,500	62,100	53,700	51,900
Uncollectible Expense	3,500	5,100	12,200	12,500
Uncollectible Costs Deferred	4,000	(3,500)	11,800	11,800
Write-Offs	(12,300)	(7,400)	(30,600)	(22,600)
Recoveries Collected	1,300	1,100	4,900	3,800
Ending Balance	$ 52,000	$ 57,400	$ 52,000	$ 57,400

SUMMARY OF SIGNIFICANT ACCOUN_6

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Components of Other Income, Net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Summary of Accounting Policies [Line Items]
Other income, net	$ 89,831	$ 43,768	$ 255,253	$ 124,588
Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion
Summary of Accounting Policies [Line Items]
Other income, net	55,300	21,700	164,500	63,900
AFUDC Equity
Summary of Accounting Policies [Line Items]
Other income, net	12,600	10,300	33,700	28,700
Equity in Earnings of Unconsolidated Affiliates
Summary of Accounting Policies [Line Items]
Other income, net	3,800	4,900	20,800	13,300
Investment Income/(Loss)
Summary of Accounting Policies [Line Items]
Other income, net	1,300	(600)	2,400	700
Interest Income
Summary of Accounting Policies [Line Items]
Other income, net	14,100	7,300	30,300	17,200
Gain on Sale of Property
Summary of Accounting Policies [Line Items]
Other income, net	2,500	0	2,700	100
Other
Summary of Accounting Policies [Line Items]
Other income, net	200	200	900	700
Equity In Earnings
Summary of Accounting Policies [Line Items]
Unrealized gain associated with investment			12,200	2,100
CL&P
Summary of Accounting Policies [Line Items]
Other income, net	21,927	6,903	61,290	21,690
CL&P \| Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion
Summary of Accounting Policies [Line Items]
Other income, net	16,200	4,200	48,300	11,200
CL&P \| AFUDC Equity
Summary of Accounting Policies [Line Items]
Other income, net	3,700	1,700	9,300	5,100
CL&P \| Equity in Earnings of Unconsolidated Affiliates
Summary of Accounting Policies [Line Items]
Other income, net	0	0	0	0
CL&P \| Investment Income/(Loss)
Summary of Accounting Policies [Line Items]
Other income, net	200	(300)	(900)	1,200
CL&P \| Interest Income
Summary of Accounting Policies [Line Items]
Other income, net	1,800	1,300	4,600	4,100
CL&P \| Gain on Sale of Property
Summary of Accounting Policies [Line Items]
Other income, net	0	0	0	0
CL&P \| Other
Summary of Accounting Policies [Line Items]
Other income, net	0	0	0	100
NSTAR Electric
Summary of Accounting Policies [Line Items]
Other income, net	37,895	20,215	101,385	58,941
NSTAR Electric \| Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion
Summary of Accounting Policies [Line Items]
Other income, net	21,600	10,100	64,000	30,300
NSTAR Electric \| AFUDC Equity
Summary of Accounting Policies [Line Items]
Other income, net	6,500	6,200	17,500	18,600
NSTAR Electric \| Equity in Earnings of Unconsolidated Affiliates
Summary of Accounting Policies [Line Items]
Other income, net	100	100	200	300
NSTAR Electric \| Investment Income/(Loss)
Summary of Accounting Policies [Line Items]
Other income, net	400	(200)	600	600
NSTAR Electric \| Interest Income
Summary of Accounting Policies [Line Items]
Other income, net	9,200	3,900	18,800	8,800
NSTAR Electric \| Gain on Sale of Property
Summary of Accounting Policies [Line Items]
Other income, net	0	0	0	0
NSTAR Electric \| Other
Summary of Accounting Policies [Line Items]
Other income, net	100	100	300	300
PSNH
Summary of Accounting Policies [Line Items]
Other income, net	8,073	3,171	23,365	11,598
PSNH \| Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion
Summary of Accounting Policies [Line Items]
Other income, net	6,800	2,500	20,100	7,900
PSNH \| AFUDC Equity
Summary of Accounting Policies [Line Items]
Other income, net	700	300	1,700	1,200
PSNH \| Equity in Earnings of Unconsolidated Affiliates
Summary of Accounting Policies [Line Items]
Other income, net	0	0	0	0
PSNH \| Investment Income/(Loss)
Summary of Accounting Policies [Line Items]
Other income, net	200	(100)	500	300
PSNH \| Interest Income
Summary of Accounting Policies [Line Items]
Other income, net	400	400	1,100	2,000
PSNH \| Gain on Sale of Property
Summary of Accounting Policies [Line Items]
Other income, net	0	0	0	100
PSNH \| Other
Summary of Accounting Policies [Line Items]
Other income, net	$ 0	$ 100	$ 0	$ 100

SUMMARY OF SIGNIFICANT ACCOUN_7

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Investments in Unconsolidated Affiliates (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	$ 2,053,404	$ 1,436,293
Offshore Wind Business - North East Offshore
Schedule of Equity Method Investments [Line Items]
Ownership interest	50%
Investments in unconsolidated affiliates	$ 1,823,500	1,213,600
Natural Gas Pipeline - Algonquin Gas Transmission, LLC
Schedule of Equity Method Investments [Line Items]
Ownership interest	15%
Investments in unconsolidated affiliates	$ 119,600	121,900
Renewable Energy Investment Fund
Schedule of Equity Method Investments [Line Items]
Ownership interest	90%
Investments in unconsolidated affiliates	$ 84,500	76,500
Other
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	$ 25,800	$ 24,300

SUMMARY OF SIGNIFICANT ACCOUN_8

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Other Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Schedule of Gross Tax Receipts [Line Items]
Gross receipts taxes	$ 52.9	$ 49.4	$ 146	$ 137.9
CL&P
Schedule of Gross Tax Receipts [Line Items]
Gross receipts taxes	$ 49.2	$ 46.1	$ 126	$ 120.7

SUMMARY OF SIGNIFICANT ACCOUN_9

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Non-cash Investing Activities (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Schedule of Supplemental Cash Flow [Line Items]
Plant additions included in accounts payable	$ 394.1	$ 359.6
CL&P
Schedule of Supplemental Cash Flow [Line Items]
Plant additions included in accounts payable	96.7	75.3
NSTAR Electric
Schedule of Supplemental Cash Flow [Line Items]
Plant additions included in accounts payable	94.5	94.2
PSNH
Schedule of Supplemental Cash Flow [Line Items]
Plant additions included in accounts payable	$ 49.7	$ 32.8

SUMMARY OF SIGNIFICANT ACCOU_10

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Reconciliation of Cash Balances to Cash and Restricted Cash (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and Cash Equivalents as reported on the Balance Sheets	$ 485,700	$ 66,800
Cash, Cash Equivalents and Restricted Cash as reported on the Statements of Cash Flows	602,256	221,008	$ 218,129	$ 264,950
Special Deposits
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	76,500	78,200
Marketable Securities
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	20,800	31,300
Other Long-Term Assets
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	19,300	44,700
CL&P
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and Cash Equivalents as reported on the Balance Sheets	14,300	55,800
Cash, Cash Equivalents and Restricted Cash as reported on the Statements of Cash Flows	23,120	74,788	71,762	99,809
CL&P \| Special Deposits
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	8,700	18,700
CL&P \| Marketable Securities
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	100	300
CL&P \| Other Long-Term Assets
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	0	0
NSTAR Electric
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and Cash Equivalents as reported on the Balance Sheets	453,600	700
Cash, Cash Equivalents and Restricted Cash as reported on the Statements of Cash Flows	470,945	18,179	20,838	17,410
NSTAR Electric \| Special Deposits
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	17,300	17,400
NSTAR Electric \| Marketable Securities
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	0	100
NSTAR Electric \| Other Long-Term Assets
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	0	0
PSNH
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and Cash Equivalents as reported on the Balance Sheets	2,200	0
Cash, Cash Equivalents and Restricted Cash as reported on the Statements of Cash Flows	24,246	35,126	$ 26,173	$ 39,555
PSNH \| Special Deposits
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	18,700	31,400
PSNH \| Marketable Securities
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	100	500
PSNH \| Other Long-Term Assets
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	$ 3,200	$ 3,200

REGULATORY ACCOUNTING - Compone

REGULATORY ACCOUNTING - Components of Regulatory Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Regulatory Assets [Line Items]
Total Regulatory Assets	$ 5,702,400	$ 5,715,800
Less: Current Portion	1,143,646	1,129,093
Total Long-Term Regulatory Assets	4,558,776	4,586,709
Benefit Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	1,408,900	1,481,000
Storm Costs, Net
Regulatory Assets [Line Items]
Total Regulatory Assets	1,243,900	1,102,700
Regulatory Tracking Mechanisms
Regulatory Assets [Line Items]
Total Regulatory Assets	941,200	1,050,500
Income Taxes, Net
Regulatory Assets [Line Items]
Total Regulatory Assets	808,500	790,700
Securitized Stranded Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	446,500	478,900
Goodwill-related
Regulatory Assets [Line Items]
Total Regulatory Assets	285,200	297,800
Derivative Liabilities
Regulatory Assets [Line Items]
Total Regulatory Assets	195,900	249,200
Asset Retirement Obligations
Regulatory Assets [Line Items]
Total Regulatory Assets	124,300	115,000
Other Regulatory Assets
Regulatory Assets [Line Items]
Total Regulatory Assets	248,000	150,000
CL&P
Regulatory Assets [Line Items]
Total Regulatory Assets	1,938,500	2,084,800
Less: Current Portion	305,556	371,609
Total Long-Term Regulatory Assets	1,632,875	1,713,161
CL&P \| Benefit Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	263,300	272,400
CL&P \| Storm Costs, Net
Regulatory Assets [Line Items]
Total Regulatory Assets	722,500	695,600
CL&P \| Regulatory Tracking Mechanisms
Regulatory Assets [Line Items]
Total Regulatory Assets	214,400	333,600
CL&P \| Income Taxes, Net
Regulatory Assets [Line Items]
Total Regulatory Assets	480,000	470,500
CL&P \| Securitized Stranded Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	0	0
CL&P \| Goodwill-related
Regulatory Assets [Line Items]
Total Regulatory Assets	0	0
CL&P \| Derivative Liabilities
Regulatory Assets [Line Items]
Total Regulatory Assets	195,900	249,200
CL&P \| Asset Retirement Obligations
Regulatory Assets [Line Items]
Total Regulatory Assets	35,300	33,600
CL&P \| Other Regulatory Assets
Regulatory Assets [Line Items]
Total Regulatory Assets	27,100	29,900
NSTAR Electric
Regulatory Assets [Line Items]
Total Regulatory Assets	1,645,200	1,579,200
Less: Current Portion	387,333	443,956
Total Long-Term Regulatory Assets	1,257,884	1,135,231
NSTAR Electric \| Benefit Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	389,000	395,500
NSTAR Electric \| Storm Costs, Net
Regulatory Assets [Line Items]
Total Regulatory Assets	459,900	341,300
NSTAR Electric \| Regulatory Tracking Mechanisms
Regulatory Assets [Line Items]
Total Regulatory Assets	339,000	376,600
NSTAR Electric \| Income Taxes, Net
Regulatory Assets [Line Items]
Total Regulatory Assets	114,500	112,600
NSTAR Electric \| Securitized Stranded Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	0	0
NSTAR Electric \| Goodwill-related
Regulatory Assets [Line Items]
Total Regulatory Assets	244,800	255,700
NSTAR Electric \| Derivative Liabilities
Regulatory Assets [Line Items]
Total Regulatory Assets	0	0
NSTAR Electric \| Asset Retirement Obligations
Regulatory Assets [Line Items]
Total Regulatory Assets	66,000	59,800
NSTAR Electric \| Other Regulatory Assets
Regulatory Assets [Line Items]
Total Regulatory Assets	32,000	37,700
PSNH
Regulatory Assets [Line Items]
Total Regulatory Assets	728,800	786,400
Less: Current Portion	110,111	107,169
Total Long-Term Regulatory Assets	618,720	679,182
PSNH \| Benefit Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	114,600	118,900
PSNH \| Storm Costs, Net
Regulatory Assets [Line Items]
Total Regulatory Assets	61,500	65,800
PSNH \| Regulatory Tracking Mechanisms
Regulatory Assets [Line Items]
Total Regulatory Assets	70,400	85,400
PSNH \| Income Taxes, Net
Regulatory Assets [Line Items]
Total Regulatory Assets	17,400	17,500
PSNH \| Securitized Stranded Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	446,500	478,900
PSNH \| Goodwill-related
Regulatory Assets [Line Items]
Total Regulatory Assets	0	0
PSNH \| Derivative Liabilities
Regulatory Assets [Line Items]
Total Regulatory Assets	0	0
PSNH \| Asset Retirement Obligations
Regulatory Assets [Line Items]
Total Regulatory Assets	4,300	4,100
PSNH \| Other Regulatory Assets
Regulatory Assets [Line Items]
Total Regulatory Assets	$ 14,100	$ 15,800

REGULATORY ACCOUNTING - Narrati

REGULATORY ACCOUNTING - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Regulatory Assets [Line Items]
Amount of regulatory costs not yet approved	$ 288.9	$ 252.5
COVID-19
Regulatory Assets [Line Items]
Net incremental deferred costs	34.6	33
CL&P
Regulatory Assets [Line Items]
Amount of regulatory costs not yet approved	121	114.9
CL&P \| COVID-19
Regulatory Assets [Line Items]
Net incremental deferred costs	16.5	18
NSTAR Electric
Regulatory Assets [Line Items]
Amount of regulatory costs not yet approved	94.6	85
NSTAR Electric \| COVID-19
Regulatory Assets [Line Items]
Net incremental deferred costs	2.2	6.1
PSNH
Regulatory Assets [Line Items]
Amount of regulatory costs not yet approved	$ 2.8	$ 3.4

REGULATORY ACCOUNTING - Compo_2

REGULATORY ACCOUNTING - Components of Regulatory Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	$ 4,889,800	$ 4,468,700
Less: Current Portion	988,714	602,432
Total Long-Term Regulatory Liabilities	3,901,106	3,866,251
EDIT due to Tax Cuts and Jobs Act of 2017
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	2,629,000	2,685,200
Cost of Removal
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	654,500	649,600
Regulatory Tracking Mechanisms
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	957,400	448,400
Deferred Portion of Non-Service Income Components of Pension, SERP and PBOP
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	240,300	148,300
Benefit Costs
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	110,900	133,500
AFUDC - Transmission
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	93,100	81,000
CL&P Settlement Agreement and Storm Performance Penalty
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	0	81,300
Other Regulatory Liabilities
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	204,600	241,400
CL&P
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	1,678,100	1,459,800
Less: Current Portion	434,465	266,489
Total Long-Term Regulatory Liabilities	1,243,581	1,193,259
CL&P \| EDIT due to Tax Cuts and Jobs Act of 2017
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	986,100	996,100
CL&P \| Cost of Removal
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	122,400	100,100
CL&P \| Regulatory Tracking Mechanisms
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	455,700	182,000
CL&P \| Deferred Portion of Non-Service Income Components of Pension, SERP and PBOP
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	28,900	12,000
CL&P \| Benefit Costs
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	0	0
CL&P \| AFUDC - Transmission
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	46,400	43,200
CL&P \| CL&P Settlement Agreement and Storm Performance Penalty
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	0	81,300
CL&P \| Other Regulatory Liabilities
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	38,600	45,100
NSTAR Electric
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	1,963,800	1,787,300
Less: Current Portion	368,044	228,248
Total Long-Term Regulatory Liabilities	1,595,754	1,559,072
NSTAR Electric \| EDIT due to Tax Cuts and Jobs Act of 2017
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	952,600	984,500
NSTAR Electric \| Cost of Removal
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	418,300	381,000
NSTAR Electric \| Regulatory Tracking Mechanisms
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	326,200	185,100
NSTAR Electric \| Deferred Portion of Non-Service Income Components of Pension, SERP and PBOP
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	127,500	90,700
NSTAR Electric \| Benefit Costs
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	88,100	107,400
NSTAR Electric \| AFUDC - Transmission
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	46,700	37,800
NSTAR Electric \| CL&P Settlement Agreement and Storm Performance Penalty
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	0	0
NSTAR Electric \| Other Regulatory Liabilities
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	4,400	800
PSNH
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	566,400	501,600
Less: Current Portion	185,092	120,176
Total Long-Term Regulatory Liabilities	381,294	381,366
PSNH \| EDIT due to Tax Cuts and Jobs Act of 2017
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	350,000	359,200
PSNH \| Cost of Removal
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	19,300	17,200
PSNH \| Regulatory Tracking Mechanisms
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	165,100	107,000
PSNH \| Deferred Portion of Non-Service Income Components of Pension, SERP and PBOP
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	25,300	14,900
PSNH \| Benefit Costs
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	0	0
PSNH \| AFUDC - Transmission
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	0	0
PSNH \| CL&P Settlement Agreement and Storm Performance Penalty
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	0	0
PSNH \| Other Regulatory Liabilities
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	$ 6,700	$ 3,300

PROPERTY, PLANT AND EQUIPMENT_3

PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION - Summary of Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Public Utility, Property, Plant and Equipment [Line Items]
Distribution - Electric	$ 18,132,200	$ 17,679,100
Distribution - Natural Gas	7,020,100	6,694,800
Transmission - Electric	13,371,200	12,882,400
Distribution - Water	1,971,100	1,900,900
Solar	200,900	200,900
Utility	40,695,500	39,358,100
Other	1,663,400	1,469,500
Property, Plant and Equipment, Gross	42,358,900	40,827,600
Less: Accumulated Depreciation
Utility	(9,070,000)	(8,885,200)
Other	(672,900)	(580,100)
Total Accumulated Depreciation	(9,742,900)	(9,465,300)
Property, Plant and Equipment, Net	32,616,000	31,362,300
Construction Work in Progress	2,413,500	2,015,400
Total Property, Plant and Equipment, Net	35,029,497	33,377,650
CL&P
Public Utility, Property, Plant and Equipment [Line Items]
Distribution - Electric	7,297,200	7,117,600
Transmission - Electric	6,022,800	5,859,000
Solar	0	0
Property, Plant and Equipment, Gross	13,320,000	12,976,600
Less: Accumulated Depreciation
Total Accumulated Depreciation	(2,571,500)	(2,572,100)
Property, Plant and Equipment, Net	10,748,500	10,404,500
Construction Work in Progress	478,200	399,000
Total Property, Plant and Equipment, Net	11,226,672	10,803,543
NSTAR Electric
Public Utility, Property, Plant and Equipment [Line Items]
Distribution - Electric	8,329,100	8,105,500
Transmission - Electric	5,243,300	5,090,500
Solar	200,900	200,900
Property, Plant and Equipment, Gross	13,773,300	13,396,900
Less: Accumulated Depreciation
Total Accumulated Depreciation	(3,322,300)	(3,227,300)
Property, Plant and Equipment, Net	10,451,000	10,169,600
Construction Work in Progress	914,200	707,000
Total Property, Plant and Equipment, Net	11,365,172	10,876,614
PSNH
Public Utility, Property, Plant and Equipment [Line Items]
Distribution - Electric	2,546,200	2,496,200
Transmission - Electric	2,106,800	1,934,600
Solar	0	0
Property, Plant and Equipment, Gross	4,653,000	4,430,800
Less: Accumulated Depreciation
Total Accumulated Depreciation	(908,200)	(908,400)
Property, Plant and Equipment, Net	3,744,800	3,522,400
Construction Work in Progress	172,800	134,100
Total Property, Plant and Equipment, Net	$ 3,917,559	$ 3,656,462

DERIVATIVE INSTRUMENTS - Gross

DERIVATIVE INSTRUMENTS - Gross Fair Values and Net Amounts of Contracts (Details) - CL&P - Level 3 - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Current Derivative Assets
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Commodity Supply and Price Risk Management	$ 15.7	$ 14.7
Netting	(0.5)	(1)
Net Amount Recorded as a Derivative	15.2	13.7
Other Long-Term Assets
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Commodity Supply and Price Risk Management	32.8	46.9
Netting	(1)	(0.9)
Net Amount Recorded as a Derivative	31.8	46
Current Derivative Liabilities
Current and Long-Term Derivative Liabilities
Commodity Supply and Price Risk Management	(78.6)	(73.5)
Netting	0	0
Net Amount Recorded as a Derivative	(78.6)	(73.5)
Long-Term Derivative Liabilities
Current and Long-Term Derivative Liabilities
Commodity Supply and Price Risk Management	(164.3)	(235.4)
Netting	0	0
Net Amount Recorded as a Derivative	$ (164.3)	$ (235.4)

DERIVATIVE INSTRUMENTS - Narrat

DERIVATIVE INSTRUMENTS - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
DERIVATIVE INSTRUMENTS - Narrative (Details) $ in Millions	Sep. 30, 2022 USD ($) MW	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) MW	Sep. 30, 2021 USD ($)	Dec. 31, 2021 $ / KWmo MW
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Percentage of costs or benefits borne under capacity-related contracts by United Illuminated Company			20%
Amount of power to be purchased under capacity-related contract (in MW) \| MW	675		675		675
Gains (losses) on deferred as regulatory costs \| $	$ 2.4	$ 0.7	$ 11.2	$ (9.5)
Level 3 \| Minimum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Percentage of exit price premiums related to derivative contracts			3.40%
Level 3 \| Maximum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Percentage of exit price premiums related to derivative contracts			7.70%
Level 3 \| Weighted Average
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Percentage of exit price premiums related to derivative contracts			6.60%
CL&P
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Percentage of costs or benefits borne under capacity-related contracts			80%
CL&P \| Weighted Average \| Measurement Input, Capacity Prices
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative measurement input \| $ / KWmo					2.61

DERIVATIVE INSTRUMENTS - Summar

DERIVATIVE INSTRUMENTS - Summary of Level 3 Derivative Contracts and Significant Unobservable Inputs Used (Details) - CL&P - Forward Reserve Prices - Level 3 - $ / KWmo	Sep. 30, 2022	Dec. 31, 2021
Minimum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative measurement input	0.44	0.50
Maximum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative measurement input	0.50	1.15
Weighted Average
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative measurement input	0.47	0.82

DERIVATIVE INSTRUMENTS - Change

DERIVATIVE INSTRUMENTS - Changes in the Level 3 Category of Derivative Assets Measured at Fair Value on a Recurring Basis (Details) - CL&P - Level 3 - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Derivatives, Net [Rollforward]
Fair Value as of Beginning of Period	$ (213.3)	$ (279.7)	$ (249.2)	$ (293.1)
Net Realized/Unrealized Gains/(Losses) Included in Regulatory Assets	2.4	0.7	11.2	(10.9)
Settlements	15	13.7	42.1	38.7
Fair Value as of End of Period	$ (195.9)	$ (265.3)	$ (195.9)	$ (265.3)

MARKETABLE SECURITIES - Narrati

MARKETABLE SECURITIES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Available-for-sale equity securities	$ 23.3		$ 23.3		$ 40.2
Unrealized (loss) gain recorded in other income	(1.5)	$ (0.5)	(10.6)	$ 2.5
CYAPC and YAEC
Debt Securities, Available-for-sale [Line Items]
Available-for-sale equity securities	170.1		170.1		214
Marketable securities held in nuclear decommissioning trust	$ 170.3		$ 170.3		$ 189.9

MARKETABLE SECURITIES - Summary

MARKETABLE SECURITIES - Summary of Available-for-Sale Debt Securities (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Amortized Cost	$ 205.4	$ 214.5
Pre-Tax Unrealized Gains	0.2	5.1
Pre-Tax Unrealized Losses	(15.5)	(0.2)
Fair Value	$ 190.1	$ 219.4

MARKETABLE SECURITIES - Contrac

MARKETABLE SECURITIES - Contractual Maturities of Available-for-Sale Debt Securities (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Amortized Cost
Less than one year	$ 22.4
One to five years	56
Six to ten years	40.8
Greater than ten years	86.2
Amortized Cost	205.4	$ 214.5
Fair Value
Less than one year	22.4
One to five years	54.6
Six to ten years	36.7
Greater than ten years	76.4
Fair Value	$ 190.1	$ 219.4

MARKETABLE SECURITIES - Marketa

MARKETABLE SECURITIES - Marketable Securities Recorded at Fair Value on a Recurring Basis by Level (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	$ 383.5	$ 473.6
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	214.2	285.5
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	169.3	188.1
Mutual Funds and Equities \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	193.4	254.2
Money Market Funds \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	20.8	31.3
U.S. Government Issued Debt Securities (Agency and Treasury) \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	77.4	81.3
Corporate Debt Securities \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	54.8	65.3
Asset-Backed Debt Securities \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	9.5	12.6
Municipal Bonds \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	13	12.3
Other Fixed Income Securities \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	$ 14.6	$ 16.6

SHORT-TERM AND LONG-TERM DEBT -

SHORT-TERM AND LONG-TERM DEBT - Narrative (Details) - USD ($)			9 Months Ended
	Oct. 15, 2022	Sep. 15, 2022	Sep. 30, 2022	Sep. 30, 2021	Jun. 14, 2022	Dec. 31, 2021
Line of Credit Facility [Line Items]
Proceeds from long-term debt issuance			$ 4,045,000,000	$ 3,150,000,000
Payment of long-term debt			775,000,000	1,142,500,000
NSTAR Electric
Line of Credit Facility [Line Items]
Notes payable to Eversource parent			2,800,000
Proceeds from long-term debt issuance		$ 400,000,000	850,000,000	600,000,000
Payment of long-term debt			0	250,000,000
NSTAR Electric \| Subsequent Event
Line of Credit Facility [Line Items]
Payment of long-term debt	$ 400,000,000
CL&P
Line of Credit Facility [Line Items]
Notes payable to Eversource parent			26,000,000
Proceeds from long-term debt issuance			0	425,000,000
Payment of long-term debt			0	120,500,000
PSNH
Line of Credit Facility [Line Items]
Notes payable to Eversource parent			139,700,000			$ 110,600,000
Proceeds from long-term debt issuance			0	350,000,000
Payment of long-term debt			0	$ 282,000,000
Line of Credit \| CL&P
Line of Credit Facility [Line Items]
Maximum borrowing capacity			450,000,000
Amount outstanding under line of credit			0
Line of Credit \| PSNH
Line of Credit Facility [Line Items]
Maximum borrowing capacity			300,000,000
Amount outstanding under line of credit			0
Line of Credit \| NSTAR Gas
Line of Credit Facility [Line Items]
Maximum borrowing capacity					$ 325,000,000
Commercial Paper \| NSTAR Electric
Line of Credit Facility [Line Items]
Maximum borrowing capacity			650,000,000
Line of Credit
Line of Credit Facility [Line Items]
Amount outstanding under line of credit			0			$ 0
Line of Credit \| NSTAR Electric
Line of Credit Facility [Line Items]
Maximum borrowing capacity			650,000,000
Eversource Parent \| Commercial Paper
Line of Credit Facility [Line Items]
Maximum borrowing capacity			2,000,000,000
Eversource Parent \| Line of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity			$ 2,000,000,000
Debt instrument term			5 years
NSTAR Electric \| Line of Credit \| NSTAR Electric
Line of Credit Facility [Line Items]
Debt instrument term			5 years

SHORT-TERM AND LONG-TERM DEBT_2

SHORT-TERM AND LONG-TERM DEBT - Borrowings Outstanding and Available under the Commercial Paper Programs (Details) - Commercial Paper - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Borrowings outstanding	$ 401.5	$ 1,343
Available borrowing capacity	$ 1,598.5	$ 657
Weighted-average interest rate (in percent)	3.34%	0.31%
NSTAR Electric
Debt Instrument [Line Items]
Borrowings outstanding	$ 0	$ 162.5
Available borrowing capacity	$ 650	$ 487.5
Weighted-average interest rate (in percent)	0%	0.14%

SHORT-TERM AND LONG-TERM DEBT_3

SHORT-TERM AND LONG-TERM DEBT - Summary of Long-Term Debt Issuance and Repayments (Details) - USD ($) $ in Thousands		1 Months Ended								9 Months Ended
	Oct. 15, 2022	Oct. 31, 2022	Sep. 30, 2022	Aug. 31, 2022	Jul. 31, 2022	Jun. 30, 2022	May 31, 2022	Mar. 31, 2022	Feb. 28, 2022	Sep. 30, 2022	Sep. 30, 2021
Debt Instrument [Line Items]
Retirement of Long-Term Debt										$ (775,000)	$ (1,142,500)
NSTAR Electric
Debt Instrument [Line Items]
Retirement of Long-Term Debt										$ 0	$ (250,000)
NSTAR Electric \| Subsequent Event
Debt Instrument [Line Items]
Retirement of Long-Term Debt	$ (400,000)
NSTAR Electric \| Debentures \| NSTAR Electric 4.55% 2022 Debentures
Debt Instrument [Line Items]
Interest rate, stated percentage							4.55%
Issuances							$ 450,000
NSTAR Electric \| Debentures \| NSTAR Electric 4.95% 2022 Debentures
Debt Instrument [Line Items]
Interest rate, stated percentage			4.95%							4.95%
Issuances			$ 400,000
NSTAR Electric \| Debentures \| NSTAR Electric 2.375% 2012 Debentures \| Subsequent Event
Debt Instrument [Line Items]
Interest rate, stated percentage		2.375%
Retirement of Long-Term Debt		$ (400,000)
Yankee Gas \| First Mortgage \| Yankee Gas 8.48% Series B First Mortgage Bonds
Debt Instrument [Line Items]
Interest rate, stated percentage								8.48%
Retirement of Long-Term Debt								$ (20,000)
Yankee Gas \| First Mortgage \| Yankee Gas 4.31% Series U First Mortgage Bonds
Debt Instrument [Line Items]
Interest rate, stated percentage			4.31%							4.31%
Issuances			$ 100,000
EGMA \| First Mortgage \| EGMA 4.70% Series C First Mortgage Bonds
Debt Instrument [Line Items]
Interest rate, stated percentage						4.70%
Issuances						$ 100,000
NSTAR Gas \| First Mortgage \| NSTAR Gas 4.40% Series V First Mortgage Bonds
Debt Instrument [Line Items]
Interest rate, stated percentage					4.40%
Issuances					$ 125,000
Aquarian Water Company \| Senior Notes \| Aquarion Water Company of Connecticut 4.69% Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage				4.69%
Issuances				$ 70,000
Aquarian Water Company \| General Mortgage Bonds \| Aquarion Water Company of New Hampshire 4.45% General Mortgage Bonds
Debt Instrument [Line Items]
Interest rate, stated percentage					4.45%
Retirement of Long-Term Debt					$ (5,000)
Eversource Parent \| Senior Notes \| Eversource Parent 2.90% Series V Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage									2.90%
Issuances									$ 650,000
Eversource Parent \| Senior Notes \| Eversource Parent 3.375% Series W Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage									3.375%
Issuances									$ 650,000
Eversource Parent \| Senior Notes \| Eversource Parent 4.20% Series X Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage						4.20%
Issuances						$ 900,000
Eversource Parent \| Senior Notes \| Eversource Parent 4.60% Series Y Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage						4.60%
Issuances						$ 600,000
Eversource Parent \| Senior Notes \| Eversource Parent 2.75% Series K Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage								2.75%
Retirement of Long-Term Debt								$ (750,000)

RATE REDUCTION BONDS AND VARI_3

RATE REDUCTION BONDS AND VARIABLE INTEREST ENTITIES - Narrative (Details) - PSNH - Rate Reduction Bonds $ in Millions	May 31, 2018 USD ($)
Debt Instrument [Line Items]
Amount of securitized rate reduction bonds issued	$ 635.7
Weighted average interest rate	3.66%

RATE REDUCTION BONDS AND VARI_4

RATE REDUCTION BONDS AND VARIABLE INTEREST ENTITIES - Summary of the Impact of Funding on the Balance Sheets (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Condensed Balance Sheet Statements, Captions [Line Items]
Securitized Stranded Cost (included in Regulatory Assets)	$ 5,702,400	$ 5,715,800
Regulatory Liabilities	3,901,106	3,866,251
Accrued Interest (included in Other Current Liabilities)	983,663	830,620
Rate Reduction Bonds - Current Portion	43,210	43,210
Rate Reduction Bonds - Long-Term Portion	410,492	453,702
Securitized Stranded Costs
Condensed Balance Sheet Statements, Captions [Line Items]
Securitized Stranded Cost (included in Regulatory Assets)	446,500	478,900
Other Regulatory Assets
Condensed Balance Sheet Statements, Captions [Line Items]
Securitized Stranded Cost (included in Regulatory Assets)	248,000	150,000
Current Derivative Assets
Condensed Balance Sheet Statements, Captions [Line Items]
Restricted Cash	76,500	78,200
Other Long-Term Assets
Condensed Balance Sheet Statements, Captions [Line Items]
Restricted Cash	19,300	44,700
PSNH
Condensed Balance Sheet Statements, Captions [Line Items]
Securitized Stranded Cost (included in Regulatory Assets)	728,800	786,400
Regulatory Liabilities	381,294	381,366
Accrued Interest (included in Other Current Liabilities)	69,801	63,005
Rate Reduction Bonds - Current Portion	43,210	43,210
Rate Reduction Bonds - Long-Term Portion	410,492	453,702
PSNH \| VIE
Condensed Balance Sheet Statements, Captions [Line Items]
Rate Reduction Bonds - Current Portion	43,200	43,200
Rate Reduction Bonds - Long-Term Portion	410,500	453,700
PSNH \| Securitized Stranded Costs
Condensed Balance Sheet Statements, Captions [Line Items]
Securitized Stranded Cost (included in Regulatory Assets)	446,500	478,900
PSNH \| Securitized Stranded Costs \| VIE
Condensed Balance Sheet Statements, Captions [Line Items]
Securitized Stranded Cost (included in Regulatory Assets)	446,500	478,900
PSNH \| Other Regulatory Assets
Condensed Balance Sheet Statements, Captions [Line Items]
Securitized Stranded Cost (included in Regulatory Assets)	14,100	15,800
PSNH \| Other Regulatory Assets \| VIE
Condensed Balance Sheet Statements, Captions [Line Items]
Regulatory Liabilities	7,900	5,400
Accrued Interest (included in Other Current Liabilities)	2,800	7,500
PSNH \| Current Derivative Assets
Condensed Balance Sheet Statements, Captions [Line Items]
Restricted Cash	18,700	31,400
PSNH \| Current Derivative Assets \| VIE
Condensed Balance Sheet Statements, Captions [Line Items]
Restricted Cash	18,000	31,100
PSNH \| Other Long-Term Assets
Condensed Balance Sheet Statements, Captions [Line Items]
Restricted Cash	3,200	3,200
PSNH \| Other Long-Term Assets \| VIE
Condensed Balance Sheet Statements, Captions [Line Items]
Restricted Cash	$ 3,200	$ 3,200

RATE REDUCTION BONDS AND VARI_5

RATE REDUCTION BONDS AND VARIABLE INTEREST ENTITIES - Summary of the Impact of Funding on the Income Statements (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Condensed Income Statements, Captions [Line Items]
Interest Expense on RRB Principal (included in Interest Expense)	$ 178,174	$ 147,962	$ 491,509	$ 431,162
PSNH
Condensed Income Statements, Captions [Line Items]
Amortization of RRB Principal (included in Amortization of Regulatory Assets, Net)	(7,398)	(17,922)	(43,449)	(62,744)
Interest Expense on RRB Principal (included in Interest Expense)	15,030	14,321	43,432	42,774
PSNH \| VIE \| Rate Reduction Bonds
Condensed Income Statements, Captions [Line Items]
Amortization of RRB Principal (included in Amortization of Regulatory Assets, Net)	10,800	10,800	32,400	32,400
Interest Expense on RRB Principal (included in Interest Expense)	$ 4,200	$ 4,500	$ 12,900	$ 13,900

PENSION BENEFITS AND POSTRETI_3

PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSION - Components of Net Periodic Benefit Expense/(Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Pension and SERP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	$ 17.5	$ 21.5	$ 52.7	$ 64.3
Interest Cost	38.6	32.5	115.8	97.5
Expected Return on Plan Assets	(130.7)	(109.5)	(393.1)	(328)
Actuarial Losses, net	28.4	60.7	87.5	183.1
Prior Service Cost/(Credit)	0.4	0.3	1.1	1.1
Total Net Periodic Benefit Plan Income	(45.8)	5.5	(136)	18
PBOP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	2.9	3.3	8.7	10.1
Interest Cost	5	4.3	15.1	12.9
Expected Return on Plan Assets	(22.5)	(19.8)	(67.5)	(59.3)
Actuarial Losses, net	0	2	0	5.9
Prior Service Cost/(Credit)	(5.4)	(5.3)	(16.2)	(15.9)
Total Net Periodic Benefit Plan Income	(20)	(15.5)	(59.9)	(46.3)
CL&P \| Pension and SERP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	4.7	5.6	13.9	17.4
Interest Cost	7.8	6.7	23.4	20.7
Expected Return on Plan Assets	(26.5)	(21.7)	(79.6)	(65)
Actuarial Losses, net	4	10.8	12.2	34.6
Prior Service Cost/(Credit)	0	0	0	0
Total Net Periodic Benefit Plan Income	(10)	1.4	(30.1)	7.7
Intercompany Income Allocations	(4)	2.2	(11.9)	5.8
CL&P \| PBOP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	0.5	0.5	1.5	1.7
Interest Cost	0.9	0.8	2.7	2.4
Expected Return on Plan Assets	(2.8)	(2.5)	(8.4)	(7.7)
Actuarial Losses, net	0	0.4	0	1.2
Prior Service Cost/(Credit)	0.3	0.3	0.8	0.8
Total Net Periodic Benefit Plan Income	(1.1)	(0.5)	(3.4)	(1.6)
Intercompany Income Allocations	(0.9)	(0.4)	(2.7)	(1.3)
NSTAR Electric \| Pension and SERP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	3.4	4	10.4	11.9
Interest Cost	8.2	6.7	24.5	20.1
Expected Return on Plan Assets	(32.1)	(27.1)	(96.2)	(81.1)
Actuarial Losses, net	8.1	15.3	24.7	46.1
Prior Service Cost/(Credit)	0.1	0.1	0.3	0.3
Total Net Periodic Benefit Plan Income	(12.3)	(1)	(36.3)	(2.7)
Intercompany Income Allocations	(3.2)	2.4	(9.3)	6.4
NSTAR Electric \| PBOP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	0.5	0.6	1.5	1.8
Interest Cost	1.3	1.1	3.9	3.3
Expected Return on Plan Assets	(10.6)	(9.2)	(31.8)	(27.7)
Actuarial Losses, net	0	0.5	0	1.6
Prior Service Cost/(Credit)	(4.2)	(4.3)	(12.7)	(12.7)
Total Net Periodic Benefit Plan Income	(13)	(11.3)	(39.1)	(33.7)
Intercompany Income Allocations	(0.9)	(0.5)	(2.7)	(1.5)
PSNH \| Pension and SERP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	1.7	2.2	5.2	6.6
Interest Cost	4.2	3.7	12.6	10.9
Expected Return on Plan Assets	(14)	(11.9)	(42.1)	(35.6)
Actuarial Losses, net	1.9	5.3	6	15.4
Prior Service Cost/(Credit)	0	0	0	0
Total Net Periodic Benefit Plan Income	(6.2)	(0.7)	(18.3)	(2.7)
Intercompany Income Allocations	(1)	0.7	(2.7)	1.9
PSNH \| PBOP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	0.3	0.3	0.8	0.9
Interest Cost	0.5	0.4	1.6	1.3
Expected Return on Plan Assets	(1.7)	(1.6)	(5)	(4.6)
Actuarial Losses, net	0	0.1	0	0.4
Prior Service Cost/(Credit)	0.1	0.1	0.3	0.3
Total Net Periodic Benefit Plan Income	(0.8)	(0.7)	(2.3)	(1.7)
Intercompany Income Allocations	$ (0.3)	$ (0.2)	$ (0.9)	$ (0.5)

PENSION BENEFITS AND POSTRETI_4

PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSION - Narrative (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Postemployment Benefits [Abstract]
Pension contributions	$ (80,000)	$ (140,000)

COMMITMENTS AND CONTINGENCIES -

COMMITMENTS AND CONTINGENCIES - Environmental Sites and Related Reserves (Details) $ in Millions	3 Months Ended	9 Months Ended
	Mar. 31, 2022 site	Sep. 30, 2022 USD ($) site	Dec. 31, 2021 USD ($)
Site Contingency [Line Items]
Number of Sites \| site	61	62
Reserve \| $		$ 121.1	$ 115.4
CL&P
Site Contingency [Line Items]
Number of Sites \| site	14	14
Reserve \| $		$ 14.1	13.9
NSTAR Electric
Site Contingency [Line Items]
Number of Sites \| site	11	11
Reserve \| $		$ 3.5	3.3
PSNH
Site Contingency [Line Items]
Number of Sites \| site	9	9
Reserve \| $		$ 6.2	$ 6.3

COMMITMENTS AND CONTINGENCIES_2

COMMITMENTS AND CONTINGENCIES - Environmental Matters Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Site Contingency [Line Items]
Reserve balance	$ 121.1	$ 115.4
MGP Sites
Site Contingency [Line Items]
Reserve balance	$ 110.6	$ 105.6

COMMITMENTS AND CONTINGENCIES_3

COMMITMENTS AND CONTINGENCIES - Non-Cancellable Commitments Under Purchase Commitment Contracts (Details) - Renewable Energy - NSTAR Electric $ in Millions	Sep. 30, 2022 USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]
2022	$ 27.1
2023	78.3
2024	269.4
2025	315.8
2026	322.1
Thereafter	5,812.2
Total	$ 6,824.9

COMMITMENTS AND CONTINGENCIES_4

COMMITMENTS AND CONTINGENCIES - Non-Cancellable Commitments Under Purchase Commitment Contracts Narrative (Details) $ in Millions	9 Months Ended
	Sep. 30, 2022 USD ($) MW
Offshore Wind Project
Unrecorded Unconditional Purchase Obligation [Line Items]
Contract term	20 years
Energy capacity (in MW) \| MW	800
Renewable Energy \| NSTAR Electric
Unrecorded Unconditional Purchase Obligation [Line Items]
Unrecorded unconditional purchase obligation	$ 6,824.9
Renewable Energy \| NSTAR Electric \| Massachusetts Clean Energy 83D Contract
Unrecorded Unconditional Purchase Obligation [Line Items]
Contract term	20 years
Unrecorded unconditional purchase obligation	$ 6,000
Renewable Energy \| NSTAR Electric \| Minimum \| Massachusetts Clean Energy 83D Contract
Unrecorded Unconditional Purchase Obligation [Line Items]
Estimated costs	240
Renewable Energy \| NSTAR Electric \| Maximum \| Massachusetts Clean Energy 83D Contract
Unrecorded Unconditional Purchase Obligation [Line Items]
Estimated costs	$ 375

COMMITMENTS AND CONTINGENCIES_5

COMMITMENTS AND CONTINGENCIES - Guarantees and Obligations Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Fair value of guarantees	$ 4.3	$ 7.3

COMMITMENTS AND CONTINGENCIES_6

COMMITMENTS AND CONTINGENCIES - Guarantees and Indemnifications (Details) $ in Millions	Sep. 30, 2022 USD ($)	Jan. 31, 2022 USD ($) letterOfCredit	Sep. 16, 2020 USD ($)	Oct. 25, 2019 USD ($)
Guarantor Obligations [Line Items]
Number of letters of credit \| letterOfCredit		2
Letter of Credit \| Eversource Investment LLC
Guarantor Obligations [Line Items]
Maximum borrowing capacity			$ 25
North East Offshore LLC
Guarantor Obligations [Line Items]
Ownership interest	50%
Sunrise Wind LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	$ 461.9
Ownership interest	50%
Revolution Wind, LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	$ 542.1
Ownership interest	50%
South Fork Wind, LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	$ 206.6
South Fork Wind, LLC \| Letter of Credit
Guarantor Obligations [Line Items]
Amount outstanding under line of credit		$ 4.3
Eversource Investment LLC \| North East Offshore LLC
Guarantor Obligations [Line Items]
Ownership interest	50%
Construction-related purchase agreements with third-party contractors \| South Fork Wind, LLC
Guarantor Obligations [Line Items]
Ownership interest	50%
Construction-related purchase agreements with third-party contractors \| North East Offshore LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	$ 759.6
Construction-related purchase agreements with third-party contractors \| Sunrise Wind LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	288.1
Construction-related purchase agreements with third-party contractors \| Revolution Wind, LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	419
Construction-related purchase agreements with third-party contractors \| South Fork Wind, LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	142.7
Funding and indemnification obligations of North East Offshore LLC \| Eversource Investment LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	94.8
Funding and indemnification obligations of North East Offshore LLC \| Eversource Investment LLC \| North East Offshore LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	910
Power Purchase Agreement \| South Fork Wind, LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	7.1
Power Purchase Agreement \| South Fork Wind, LLC \| South Fork Wind, LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	$ 7.1
Ownership interest	50%
OREC capacity production \| Sunrise Wind LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	$ 2.2
OREC capacity production \| Sunrise Wind LLC \| Sunrise Wind LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)				$ 15.4
Ownership interest	50%
Real estate purchase \| Bay State Wind LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	$ 2.5
Transmission interconnection \| South Fork Wind, LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	1.2
Letter of Credit \| Eversource Investment LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	4.3
Surety bonds \| Various
Guarantor Obligations [Line Items]
Maximum exposure (up to)	35.7
Lease payments for real estate \| Eversource Service
Guarantor Obligations [Line Items]
Maximum exposure (up to)	0.6
Performance guarantee \| North East Offshore LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	$ 1,300
Percent of obligations guaranteed	50%
Payment guarantee \| North East Offshore LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	$ 62.5
Percent of obligations guaranteed	50%

COMMITMENTS AND CONTINGENCIES_7

COMMITMENTS AND CONTINGENCIES - Spent Nuclear Fuel Obligations - Yankee Companies (Details) $ in Millions	Mar. 25, 2021 USD ($)
CYAPC, YAEC, and MYAPC \| Yankee Companies
Loss Contingencies [Line Items]
Damages sought	$ 120.4

COMMITMENTS AND CONTINGENCIES_8

COMMITMENTS AND CONTINGENCIES - FERC ROE Complaints (Details) $ in Millions			9 Months Ended	36 Months Ended
	Apr. 29, 2016 complaint	Oct. 16, 2014	Sep. 30, 2022 USD ($) period	Oct. 15, 2014	Dec. 31, 2021 USD ($)	Dec. 23, 2019 complaint	Nov. 21, 2019 complaint	Oct. 16, 2018 complaint	Jul. 31, 2014 complaint
Loss Contingencies [Line Items]
Percentage of base ROE reasonably justified			10.41%
Percentage of incentive cap on total ROE			13.08%
FERC ROE Complaints
Loss Contingencies [Line Items]
Number of complaints filed \| complaint	4					4	2	4
Period of complaint			15 months
Basis point change			0.10%
Estimate of possible loss for each 10 basis point change to base ROE			$ 3
Number of complain periods \| period			4
FERC ROE First, Second and Third Complaints
Loss Contingencies [Line Items]
Number of complaints filed \| complaint									3
Base ROE subsequently authorized			11.14%
FERC ROE First, Second and Third Complaints \| Minimum
Loss Contingencies [Line Items]
Percentage of maximum ROE for any incentive project				11.14%
FERC ROE First, Second and Third Complaints \| Maximum
Loss Contingencies [Line Items]
Percentage of maximum ROE for any incentive project				13.10%
FERC ROE Fourth Complaint
Loss Contingencies [Line Items]
Base ROE percentage of complaint period	10.57%
Maximum percentage cap of ROE for incentive projects	11.74%
FERC ROE First Complaint
Loss Contingencies [Line Items]
Base ROE subsequently authorized		10.57%
Percentage of maximum ROE for any incentive project		11.74%
Amounts associated with first complaint refunded			$ 38.9
FERC ROE First Complaint \| CL&P
Loss Contingencies [Line Items]
Amounts associated with first complaint refunded			22.4
FERC ROE First Complaint \| NSTAR Electric
Loss Contingencies [Line Items]
Amounts associated with first complaint refunded			13.7
FERC ROE First Complaint \| PSNH
Loss Contingencies [Line Items]
Amounts associated with first complaint refunded			$ 2.8
FERC ROE Second Complaint
Loss Contingencies [Line Items]
Base ROE percentage of complaint period			10.57%
Percentage of maximum ROE for any incentive project			11.74%
Loss contingency, estimate of possible earnings impact			$ 39.1		$ 39.1
FERC ROE Second Complaint \| CL&P
Loss Contingencies [Line Items]
Loss contingency, estimate of possible earnings impact			21.4		21.4
FERC ROE Second Complaint \| NSTAR Electric
Loss Contingencies [Line Items]
Loss contingency, estimate of possible earnings impact			14.6		14.6
FERC ROE Second Complaint \| PSNH
Loss Contingencies [Line Items]
Loss contingency, estimate of possible earnings impact			$ 3.1		$ 3.1

COMMITMENTS AND CONTINGENCIES_9

COMMITMENTS AND CONTINGENCIES - Eversource and NSTAR Electric Boston Harbor Civil Action (Details)	12 Months Ended
	Dec. 31, 2016 kV
Commitments and Contingencies Disclosure [Abstract]
Amount of capacity required for installation of distribution cable (in kV)	115

COMMITMENTS AND CONTINGENCIE_10

COMMITMENTS AND CONTINGENCIES - CL&P Regulatory Matters (Details) $ / shares in Units, $ in Thousands		9 Months Ended
	Oct. 01, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($) $ / shares	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 01, 2021 USD ($)	Jul. 14, 2021 USD ($) $ / shares	May 07, 2021	May 06, 2021 USD ($)	Apr. 28, 2021	Dec. 31, 2020 USD ($)
Loss Contingencies [Line Items]
Loss contingency, allowed rate of ROE (in percent)										9.25%
Loss contingency, allowed rate of ROE, downward adjustment (in basis points)										0.0090
Cash, cash equivalents, restricted cash and restricted cash equivalents		$ 602,256	$ 218,129		$ 221,008						$ 264,950
Regulatory Liabilities		988,714			602,432
Loss related to litigation settlement		(72,041)	103,583
Basis points reduction to return on equity, scenario 1	0.90%
Basis points reduction to return on equity, scenario 2	0.45%
CL&P
Loss Contingencies [Line Items]
Cash, cash equivalents, restricted cash and restricted cash equivalents		23,120	71,762		74,788						$ 99,809
Regulatory Liabilities		434,465			266,489
Loss related to litigation settlement		(72,041)	$ 103,583
Customer Assistance Fund \| CL&P
Loss Contingencies [Line Items]
Cash, cash equivalents, restricted cash and restricted cash equivalents				$ 10,000	$ 10,000
Unfavorable Regulatory Action
Loss Contingencies [Line Items]
Loss contingency, estimate of possible earnings impact									$ 30,000
Loss contingency, estimate of possible earnings impact, non-compliance with performance standards									28,400
Loss contingency, estimate of possible earnings impact, accident reporting violation fines									$ 1,600
Non-compliance fine							$ 28,600
Loss contingency, accident reporting violation fines							$ 200
Loss contingency, penalty rate as a percent of distribution revenues								2.50%
Loss contingency, after-tax earnings impact per share (in dollars per share) \| $ / shares			$ 0.25				$ 0.07
Loss related to litigation settlement			$ 103,600
Loss Contingency, Settlement Agreement, Customer Credits And Assistance	$ 75,000
Gain (Loss) Related To Litigation Settlement, Net Of Tax			(85,800)
Unfavorable Regulatory Action \| Sales
Loss Contingencies [Line Items]
Loss related to litigation settlement			65,000
Unfavorable Regulatory Action \| Oil and Gas, Operation and Maintenance
Loss Contingencies [Line Items]
Loss related to litigation settlement			10,000
Unfavorable Regulatory Action \| CL&P
Loss Contingencies [Line Items]
Loss contingency, estimate of possible earnings impact, non-compliance with performance standards						$ 28,400
Loss contingency, settlement agreement, customer credits	65,000
Loss contingency, settlement agreement, customer assistance initiatives	$ 10,000
Regulatory Liabilities			$ 75,000
Unfavorable Regulatory Action \| CL&P \| Sales
Loss Contingencies [Line Items]
Loss related to litigation settlement		$ 65,000

FAIR VALUE OF FINANCIAL INSTR_3

FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Preferred Stock Not Subject to Mandatory Redemption	$ 155,570	$ 155,570
Rate Reduction Bonds	410,492	453,702
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Preferred Stock Not Subject to Mandatory Redemption	155,600	155,600
Long-Term Debt	21,442,400	18,216,700
Rate Reduction Bonds	453,700	496,900
Fair Value \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Preferred Stock Not Subject to Mandatory Redemption	146,000	166,300
Long-Term Debt	19,010,300	19,636,300
Rate Reduction Bonds	429,500	543,300
CL&P
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Preferred Stock Not Subject to Mandatory Redemption	116,200	116,200
CL&P \| Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Preferred Stock Not Subject to Mandatory Redemption	116,200	116,200
Long-Term Debt	4,216,200	4,215,400
Rate Reduction Bonds	0	0
CL&P \| Fair Value \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Preferred Stock Not Subject to Mandatory Redemption	107,400	122,300
Long-Term Debt	3,774,900	4,848,900
Rate Reduction Bonds	0	0
NSTAR Electric
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Preferred Stock Not Subject to Mandatory Redemption	43,000	43,000
NSTAR Electric \| Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Preferred Stock Not Subject to Mandatory Redemption	43,000	43,000
Long-Term Debt	4,824,800	3,985,400
Rate Reduction Bonds	0	0
NSTAR Electric \| Fair Value \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Preferred Stock Not Subject to Mandatory Redemption	38,600	44,000
Long-Term Debt	4,415,100	4,453,500
Rate Reduction Bonds	0	0
PSNH
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Rate Reduction Bonds	410,492	453,702
PSNH \| Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Preferred Stock Not Subject to Mandatory Redemption	0	0
Long-Term Debt	1,164,400	1,163,800
Rate Reduction Bonds	453,700	496,900
PSNH \| Fair Value \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Preferred Stock Not Subject to Mandatory Redemption	0	0
Long-Term Debt	960,100	1,220,600
Rate Reduction Bonds	$ 429,500	$ 543,300

ACCUMULATED OTHER COMPREHENSI_3

ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
AOCI Attributable to Parent [Roll Forward]
OCI Before Reclassifications							$ (4,500)	$ (3,000)
Amounts Reclassified from AOCI							5,800	7,500
Net OCI	$ 1,858	$ (1,293)	$ 704	$ 2,477	$ 881	$ 1,188	1,269	4,546
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent [Roll Forward]
Beginning balance			(42,300)			(76,400)	(42,300)	(76,400)
Net OCI	1,858	$ (1,293)	704	2,477	$ 881	1,188
Ending balance	(41,000)			(71,900)			(41,000)	(71,900)
Qualified Cash Flow Hedging Instruments
AOCI Attributable to Parent [Roll Forward]
Beginning balance			(400)			(1,400)	(400)	(1,400)
OCI Before Reclassifications							0	0
Amounts Reclassified from AOCI							0	1,000
Net OCI							0	1,000
Ending balance	(400)			(400)			(400)	(400)
Unrealized Gains/(Losses) on Marketable Securities
AOCI Attributable to Parent [Roll Forward]
Beginning balance			400			1,100	400	1,100
OCI Before Reclassifications							(2,000)	(600)
Amounts Reclassified from AOCI							0	0
Net OCI							(2,000)	(600)
Ending balance	(1,600)			500			(1,600)	500
Defined Benefit Plans
AOCI Attributable to Parent [Roll Forward]
Beginning balance			$ (42,300)			$ (76,100)	(42,300)	(76,100)
OCI Before Reclassifications							(2,500)	(2,400)
Amounts Reclassified from AOCI							5,800	6,500
Net OCI							3,300	4,100
Ending balance	$ (39,000)			$ (72,000)			$ (39,000)	$ (72,000)

COMMON SHARES - Common Shares A

COMMON SHARES - Common Shares Authorized and Issued (Details) - $ / shares	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Class of Stock [Line Items]
Par value (in dollars per share)	$ 5	$ 5
Authorized (in shares)	380,000,000		380,000,000
Issued (in shares)	359,984,073		357,818,402
CL&P
Class of Stock [Line Items]
Par value (in dollars per share)	$ 10
Authorized (in shares)	24,500,000		24,500,000
Issued (in shares)	6,035,205		6,035,205
NSTAR Electric
Class of Stock [Line Items]
Par value (in dollars per share)	$ 1
Authorized (in shares)	100,000,000		100,000,000
Issued (in shares)	200		200
PSNH
Class of Stock [Line Items]
Par value (in dollars per share)	$ 1
Authorized (in shares)	100,000,000		100,000,000
Issued (in shares)	301		301

COMMON SHARES - Narrative (Deta

COMMON SHARES - Narrative (Details) $ in Millions			3 Months Ended
COMMON SHARES - Narrative (Details) $ in Millions	Oct. 03, 2022 USD ($) customer shares	May 11, 2022 USD ($)	Sep. 30, 2022 USD ($) shares	Dec. 31, 2021 shares
Business Acquisition [Line Items]
Sale of stock, issuance of common stock, maximum \| $		$ 1,200
Sale of stock, consideration received on transaction \| $			$ 197.1
Sale of stock, number of shares issued in transaction (in shares)			2,165,671
Treasury stock (in shares)			12,635,324	13,415,206
Common stock outstanding (in shares)			347,348,749	344,403,196
The Torrington Water Company (TWC) \| Subsequent Event \| Subsidiaries
Business Acquisition [Line Items]
Business acquisition, number of treasury shares issued (in shares)	925,264
Consideration transferred \| $	$ 72
Number of customers \| customer	10,100

COMMON SHAREHOLDERS' EQUITY A_2

COMMON SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Equity [Abstract]
Dividends on preferred stock	$ 1,880	$ 1,880	$ 1,880	$ 1,880	$ 1,880	$ 1,880	$ 5,600	$ 5,600
Noncontrolling interest attributed to preferred stock of subsidiaries	$ 155,570						$ 155,570		$ 155,570

EARNINGS PER SHARE - Narrative

EARNINGS PER SHARE - Narrative (Details) - shares	3 Months Ended		9 Months Ended
EARNINGS PER SHARE - Narrative (Details) - shares	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Antidilutive share awards excluded from the EPS computation (in shares)	0	0	0	0

EARNINGS PER SHARE - Components

EARNINGS PER SHARE - Components of Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Net Income Attributable to Common Shareholders	$ 349,409	$ 283,166	$ 1,084,717	$ 913,829
Net Income Attributable to Common Shareholders	$ 349,400	$ 283,200	$ 1,084,700	$ 913,800
Weighted Average Common Shares Outstanding:
Basic (in shares)	347,297,411	344,023,846	346,115,823	343,848,905
Dilutive effect (in shares)	465,282	645,936	457,278	631,151
Diluted (in shares)	347,762,693	344,669,782	346,573,101	344,480,056
Basic EPS (in dollars per share)	$ 1.01	$ 0.82	$ 3.13	$ 2.66
Diluted EPS (in dollars per share)	$ 1	$ 0.82	$ 3.13	$ 2.65

REVENUES (Details)

REVENUES (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
REVENUES (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021	Sep. 01, 2021	May 06, 2021
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	$ 3,259,400	$ 2,444,600	$ 9,273,000	$ 7,355,600
Alternative Revenue Programs	(46,600)	(13,500)	(22,700)	21,300
Other Revenues	2,800	1,700	9,300	4,300
Operating Revenues	$ 3,215,645	$ 2,432,794	9,259,596	7,381,172
(Customer Credits)/Reserve at CL&P related to PURA Settlement Agreement and Storm Performance Penalty			(72,041)	103,583
Operating Lease, Income, Comprehensive Income [Extensible Enumeration]	Operating Revenues	Operating Revenues
Lease revenue	$ 1,000	$ 1,100	3,100	3,800
Unfavorable Regulatory Action
Disaggregation of Revenue [Line Items]
(Customer Credits)/Reserve at CL&P related to PURA Settlement Agreement and Storm Performance Penalty				103,600
Loss contingency, estimate of possible earnings impact, non-compliance with performance standards							$ 28,400
Unfavorable Regulatory Action \| Sales
Disaggregation of Revenue [Line Items]
(Customer Credits)/Reserve at CL&P related to PURA Settlement Agreement and Storm Performance Penalty				65,000
CL&P
Disaggregation of Revenue [Line Items]
Operating Revenues	$ 1,369,101	$ 919,643	3,690,614	2,736,513
(Customer Credits)/Reserve at CL&P related to PURA Settlement Agreement and Storm Performance Penalty			(72,041)	103,583
Operating Lease, Income, Comprehensive Income [Extensible Enumeration]	Operating Revenues	Operating Revenues
Lease revenue	$ 200	$ 200	600	600
CL&P \| Unfavorable Regulatory Action
Disaggregation of Revenue [Line Items]
Loss contingency, estimate of possible earnings impact, non-compliance with performance standards						$ 28,400
CL&P \| Unfavorable Regulatory Action \| Sales
Disaggregation of Revenue [Line Items]
(Customer Credits)/Reserve at CL&P related to PURA Settlement Agreement and Storm Performance Penalty			65,000
NSTAR Electric
Disaggregation of Revenue [Line Items]
Operating Revenues	$ 1,105,452	$ 918,698	2,752,278	2,343,116
Operating Lease, Income, Comprehensive Income [Extensible Enumeration]	Operating Revenues	Operating Revenues
Lease revenue	$ 600	$ 700	1,900	2,500
PSNH
Disaggregation of Revenue [Line Items]
Operating Revenues	$ 430,642	$ 314,893	1,077,124	887,177
Operating Lease, Income, Comprehensive Income [Extensible Enumeration]	Operating Revenues	Operating Revenues
Total Retail Tariff Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	$ 2,752,600	$ 2,212,300	7,799,600	6,593,800
Residential
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,633,300	1,267,600	4,663,000	3,920,500
Commercial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	984,000	823,600	2,718,600	2,302,200
Industrial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	135,300	121,100	418,000	371,100
Wholesale Transmission Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	133,900	141,700	333,100	325,500
Wholesale Market Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	340,900	147,100	987,300	437,200
Other Revenues from Contracts with Customers
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	25,100	37,800	81,300	94,700
(Reserve for)/Amortization of Revenues Subject to Refund
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	6,900	(94,300)	71,700	(95,600)
Operating Segments \| CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,589,900	1,143,600	4,111,400	3,204,400
Alternative Revenue Programs	(65,100)	(82,000)	28,300	(74,200)
Other Revenues	200	200	500	300
Operating Segments \| NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,268,500	1,055,700	3,181,700	2,713,900
Alternative Revenue Programs	(20,500)	(14,400)	(14,400)	(11,300)
Other Revenues	1,800	700	5,400	2,500
Operating Segments \| PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	497,000	394,200	1,227,400	1,047,500
Alternative Revenue Programs	(7,200)	(24,100)	8,800	(18,800)
Other Revenues	600	600	2,100	1,100
Operating Segments \| Total Retail Tariff Sales Revenues \| CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,092,200	856,400	2,784,500	2,338,100
Operating Segments \| Total Retail Tariff Sales Revenues \| NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,016,500	849,100	2,471,800	2,134,200
Operating Segments \| Total Retail Tariff Sales Revenues \| PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	381,000	286,700	929,700	787,900
Operating Segments \| Residential \| CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	739,100	572,000	1,864,400	1,558,600
Operating Segments \| Residential \| NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	507,600	401,900	1,239,000	1,069,000
Operating Segments \| Residential \| PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	246,200	172,900	580,500	467,300
Operating Segments \| Commercial \| CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	311,200	249,400	808,700	679,300
Operating Segments \| Commercial \| NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	469,600	411,300	1,128,800	975,700
Operating Segments \| Commercial \| PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	110,400	88,500	280,500	249,200
Operating Segments \| Industrial \| CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	41,900	35,000	111,400	100,200
Operating Segments \| Industrial \| NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	39,300	35,900	104,000	89,500
Operating Segments \| Industrial \| PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	24,400	25,300	68,700	71,400
Operating Segments \| Wholesale Transmission Revenues \| CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	250,300	268,200	575,200	652,800
Operating Segments \| Wholesale Transmission Revenues \| NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	183,800	171,000	512,700	478,200
Operating Segments \| Wholesale Transmission Revenues \| PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	86,200	88,000	213,100	207,400
Operating Segments \| Wholesale Market Sales Revenues \| CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	232,900	100,300	656,300	278,100
Operating Segments \| Wholesale Market Sales Revenues \| NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	57,500	21,300	163,100	64,700
Operating Segments \| Wholesale Market Sales Revenues \| PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	26,700	12,200	75,800	37,300
Operating Segments \| Other Revenues from Contracts with Customers \| CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	7,500	12,100	22,800	28,800
Operating Segments \| Other Revenues from Contracts with Customers \| NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	10,700	14,300	34,100	36,800
Operating Segments \| Other Revenues from Contracts with Customers \| PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	3,100	7,300	8,800	14,900
Operating Segments \| (Reserve for)/Amortization of Revenues Subject to Refund \| CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	7,000	(93,400)	72,600	(93,400)
Operating Segments \| (Reserve for)/Amortization of Revenues Subject to Refund \| NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Operating Segments \| (Reserve for)/Amortization of Revenues Subject to Refund \| PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Operating Segments \| Reserves For Revenues Subject To Refund \| CL&P \| Unfavorable Regulatory Action
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers					$ 93,400
Other
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	343,500	326,100	1,062,700	999,100
Alternative Revenue Programs	0	0	0	0
Other Revenues	0	0	0	0
Operating Revenues	343,500	326,100	1,062,700	999,100
Other \| Total Retail Tariff Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Other \| Residential
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Other \| Commercial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Other \| Industrial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Other \| Wholesale Transmission Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	29,900	23,000	79,400	62,500
Other \| Wholesale Market Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Other \| Other Revenues from Contracts with Customers
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	313,600	303,100	983,300	936,600
Other \| (Reserve for)/Amortization of Revenues Subject to Refund
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Eliminations
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	(735,100)	(716,100)	(2,041,200)	(2,021,900)
Alternative Revenue Programs	52,600	102,000	(46,900)	103,000
Other Revenues	0	0	0	0
Operating Revenues	(682,500)	(614,100)	(2,088,100)	(1,918,900)
Eliminations \| Total Retail Tariff Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	(6,900)	(6,200)	(19,000)	(16,900)
Eliminations \| Residential
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Eliminations \| Commercial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	(1,700)	(1,400)	(4,200)	(4,100)
Eliminations \| Industrial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	(5,200)	(4,800)	(14,800)	(12,800)
Eliminations \| Wholesale Transmission Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	(416,300)	(408,500)	(1,047,300)	(1,075,400)
Eliminations \| Wholesale Market Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Eliminations \| Other Revenues from Contracts with Customers
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	(311,900)	(301,400)	(974,900)	(929,600)
Eliminations \| (Reserve for)/Amortization of Revenues Subject to Refund
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Eliminations \| CL&P
Disaggregation of Revenue [Line Items]
Operating Revenues	(155,900)	(142,200)	(449,600)	(394,000)
Eliminations \| NSTAR Electric
Disaggregation of Revenue [Line Items]
Operating Revenues	(144,300)	(123,300)	(420,400)	(362,000)
Eliminations \| PSNH
Disaggregation of Revenue [Line Items]
Operating Revenues	(59,800)	(55,800)	(161,200)	(142,600)
Electric Distribution \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	2,830,400	2,061,800	7,204,500	5,614,000
Alternative Revenue Programs	(37,700)	(7,900)	(26,200)	14,900
Other Revenues	2,400	1,300	7,500	3,200
Operating Revenues	2,795,100	2,055,200	7,185,800	5,632,100
Electric Distribution \| Operating Segments \| Total Retail Tariff Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	2,489,000	1,991,800	6,184,000	5,258,900
Electric Distribution \| Operating Segments \| Residential
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,492,900	1,146,800	3,683,900	3,094,900
Electric Distribution \| Operating Segments \| Commercial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	890,500	748,800	2,216,000	1,902,900
Electric Distribution \| Operating Segments \| Industrial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	105,600	96,200	284,100	261,100
Electric Distribution \| Operating Segments \| Wholesale Transmission Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Electric Distribution \| Operating Segments \| Wholesale Market Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	317,100	133,800	895,200	380,100
Electric Distribution \| Operating Segments \| Other Revenues from Contracts with Customers
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	17,300	29,600	53,400	68,400
Electric Distribution \| Operating Segments \| (Reserve for)/Amortization of Revenues Subject to Refund
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	7,000	(93,400)	71,900	(93,400)
Natural Gas Distribution \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	228,300	182,700	1,564,200	1,256,400
Alternative Revenue Programs	(2,800)	2,700	4,300	21,300
Other Revenues	100	100	900	100
Operating Revenues	225,600	185,500	1,569,400	1,277,800
Natural Gas Distribution \| Operating Segments \| Total Retail Tariff Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	205,000	169,300	1,472,100	1,198,700
Natural Gas Distribution \| Operating Segments \| Residential
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	94,700	81,700	870,000	722,800
Natural Gas Distribution \| Operating Segments \| Commercial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	76,700	59,000	456,900	356,400
Natural Gas Distribution \| Operating Segments \| Industrial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	33,600	28,600	145,200	119,500
Natural Gas Distribution \| Operating Segments \| Wholesale Transmission Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Natural Gas Distribution \| Operating Segments \| Wholesale Market Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	22,700	12,200	89,300	54,100
Natural Gas Distribution \| Operating Segments \| Other Revenues from Contracts with Customers
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	600	1,200	2,800	3,600
Natural Gas Distribution \| Operating Segments \| (Reserve for)/Amortization of Revenues Subject to Refund
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Electric Transmission \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	523,700	530,700	1,312,200	1,348,600
Alternative Revenue Programs	(55,100)	(112,600)	48,900	(119,200)
Other Revenues	200	200	500	700
Operating Revenues	468,800	418,300	1,361,600	1,230,100
Electric Transmission \| Operating Segments \| Total Retail Tariff Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Electric Transmission \| Operating Segments \| Residential
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Electric Transmission \| Operating Segments \| Commercial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Electric Transmission \| Operating Segments \| Industrial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Electric Transmission \| Operating Segments \| Wholesale Transmission Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	520,300	527,200	1,301,000	1,338,400
Electric Transmission \| Operating Segments \| Wholesale Market Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Electric Transmission \| Operating Segments \| Other Revenues from Contracts with Customers
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	3,400	3,500	10,500	10,200
Electric Transmission \| Operating Segments \| (Reserve for)/Amortization of Revenues Subject to Refund
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	700	0
Water Distribution \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	68,600	59,400	170,600	159,400
Alternative Revenue Programs	(3,600)	2,300	(2,800)	1,300
Other Revenues	100	100	400	300
Operating Revenues	65,100	61,800	168,200	161,000
Water Distribution \| Operating Segments \| Total Retail Tariff Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	65,500	57,400	162,500	153,100
Water Distribution \| Operating Segments \| Residential
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	45,700	39,100	109,100	102,800
Water Distribution \| Operating Segments \| Commercial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	18,500	17,200	49,900	47,000
Water Distribution \| Operating Segments \| Industrial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,300	1,100	3,500	3,300
Water Distribution \| Operating Segments \| Wholesale Transmission Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Water Distribution \| Operating Segments \| Wholesale Market Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,100	1,100	2,800	3,000
Water Distribution \| Operating Segments \| Other Revenues from Contracts with Customers
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	2,100	1,800	6,200	5,500
Water Distribution \| Operating Segments \| (Reserve for)/Amortization of Revenues Subject to Refund
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	$ (100)	$ (900)	$ (900)	$ (2,200)

SEGMENT INFORMATION - Narrative

SEGMENT INFORMATION - Narrative (Details) $ in Millions	9 Months Ended
SEGMENT INFORMATION - Narrative (Details) $ in Millions	Sep. 30, 2022 USD ($) reportableSegment
CL&P
Segment Reporting Information [Line Items]
Number of reportable segments	1
NSTAR Electric
Segment Reporting Information [Line Items]
Number of reportable segments	1
PSNH
Segment Reporting Information [Line Items]
Number of reportable segments	1
Affiliated Entity
Segment Reporting Information [Line Items]
Amount of natural gas transmission purchased \| $	$ 77.7

SEGMENT INFORMATION - Summary o

SEGMENT INFORMATION - Summary of Segment Information and Segmented Total Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Segment Reporting Information [Line Items]
Operating Revenues	$ 3,215,645	$ 2,432,794	$ 9,259,596	$ 7,381,172
Depreciation and Amortization	(413,400)	(322,100)	(1,304,400)	(981,100)
Other Operating Expenses	(2,244,900)	(1,627,400)	(6,279,300)	(4,879,600)
Operating Income/(Loss)	557,293	483,331	1,675,917	1,520,503
Interest Expense	(178,174)	(147,962)	(491,509)	(431,162)
Other Income, Net	89,831	43,768	255,253	124,588
Net Income/(Loss) Attributable to Common Shareholders	349,409	283,166	1,084,717	913,829
Cash Flows Used for Investments in Plant			2,352,743	2,211,136
Assets	51,599,425		51,599,425		$ 48,492,144
Other
Segment Reporting Information [Line Items]
Operating Revenues	343,500	326,100	1,062,700	999,100
Depreciation and Amortization	(35,400)	(28,000)	(98,800)	(83,700)
Other Operating Expenses	(265,700)	(275,200)	(876,500)	(860,300)
Operating Income/(Loss)	42,400	22,900	87,400	55,100
Interest Expense	(69,600)	(42,500)	(169,900)	(125,900)
Other Income, Net	429,900	325,900	1,280,100	1,059,200
Net Income/(Loss) Attributable to Common Shareholders	379,000	304,900	1,163,600	982,500
Cash Flows Used for Investments in Plant			177,600	157,600
Assets	24,865,400		24,865,400		22,674,700
Eliminations
Segment Reporting Information [Line Items]
Operating Revenues	(682,500)	(614,100)	(2,088,100)	(1,918,900)
Depreciation and Amortization	1,800	1,100	5,100	3,100
Other Operating Expenses	681,100	613,700	2,081,900	1,918,900
Operating Income/(Loss)	400	700	(1,100)	3,100
Interest Expense	20,000	12,700	46,300	37,000
Other Income, Net	(423,000)	(320,400)	(1,251,500)	(1,046,200)
Net Income/(Loss) Attributable to Common Shareholders	(402,600)	(307,000)	(1,206,300)	(1,006,100)
Cash Flows Used for Investments in Plant			0	0
Assets	(23,804,400)		(23,804,400)		(21,738,600)
Electric Distribution \| Operating Segments
Segment Reporting Information [Line Items]
Operating Revenues	2,795,100	2,055,200	7,185,800	5,632,100
Depreciation and Amortization	(256,900)	(179,800)	(806,700)	(534,100)
Other Operating Expenses	(2,261,500)	(1,640,500)	(5,743,200)	(4,531,300)
Operating Income/(Loss)	276,700	234,900	635,900	566,700
Interest Expense	(64,500)	(61,000)	(184,200)	(175,400)
Other Income, Net	59,600	25,400	160,100	76,000
Net Income/(Loss) Attributable to Common Shareholders	225,100	150,400	495,000	365,400
Cash Flows Used for Investments in Plant			823,900	764,900
Assets	26,992,600		26,992,600		25,411,200
Natural Gas Distribution \| Operating Segments
Segment Reporting Information [Line Items]
Operating Revenues	225,600	185,500	1,569,400	1,277,800
Depreciation and Amortization	(25,100)	(28,500)	(116,200)	(108,700)
Other Operating Expenses	(226,300)	(176,900)	(1,244,300)	(970,600)
Operating Income/(Loss)	(25,800)	(19,900)	208,900	198,500
Interest Expense	(18,800)	(15,700)	(51,200)	(44,200)
Other Income, Net	11,100	6,700	31,900	15,200
Net Income/(Loss) Attributable to Common Shareholders	(24,600)	(22,000)	147,200	129,600
Cash Flows Used for Investments in Plant			424,500	506,400
Assets	7,692,600		7,692,600		7,215,900
Electric Transmission \| Operating Segments
Segment Reporting Information [Line Items]
Operating Revenues	468,800	418,300	1,361,600	1,230,100
Depreciation and Amortization	(85,100)	(75,400)	(250,300)	(223,400)
Other Operating Expenses	(143,700)	(122,400)	(414,300)	(359,600)
Operating Income/(Loss)	240,000	220,500	697,000	647,100
Interest Expense	(36,600)	(33,500)	(107,300)	(98,700)
Other Income, Net	10,100	5,000	28,300	17,300
Net Income/(Loss) Attributable to Common Shareholders	155,800	139,400	455,800	412,400
Cash Flows Used for Investments in Plant			823,300	691,000
Assets	13,225,300		13,225,300		12,377,800
Water Distribution \| Operating Segments
Segment Reporting Information [Line Items]
Operating Revenues	65,100	61,800	168,200	161,000
Depreciation and Amortization	(12,700)	(11,500)	(37,500)	(34,300)
Other Operating Expenses	(28,800)	(26,100)	(82,900)	(76,700)
Operating Income/(Loss)	23,600	24,200	47,800	50,000
Interest Expense	(8,700)	(8,000)	(25,200)	(24,000)
Other Income, Net	2,100	1,200	6,400	3,100
Net Income/(Loss) Attributable to Common Shareholders	16,700	$ 17,500	29,400	30,000
Cash Flows Used for Investments in Plant			103,400	$ 91,200
Assets	$ 2,627,900		$ 2,627,900		$ 2,551,100