Clearway Energy (CWEN) 10-Q3 Aug 212021 Q2 Quarterly reportFinancial data

Company Profile

Cover Page

Cover Page - shares	6 Months Ended
Cover Page - shares	Jun. 30, 2021	Jul. 31, 2021
Class of Stock [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2021
Document Transition Report	false
Entity File Number	001-36002
Entity Registrant Name	Clearway Energy, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	46-1777204
Entity Address, Address Line One	300 Carnegie Center, Suite 300
Entity Address, City or Town	Princeton
Entity Address, State or Province	NJ
Entity Address, Postal Zip Code	08540
City Area Code	609
Local Phone Number	608-1525
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Entity Central Index Key	0001567683
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Common Class A
Class of Stock [Line Items]
Title of 12(b) Security	Class A Common Stock, par value $0.01
Trading Symbol	CWEN.A
Security Exchange Name	NYSE
Entity common stock, shares outstanding		34,599,645
Common Class B
Class of Stock [Line Items]
Entity common stock, shares outstanding		42,738,750
Common Class C
Class of Stock [Line Items]
Title of 12(b) Security	Class C Common Stock, par value $0.01
Trading Symbol	CWEN
Security Exchange Name	NYSE
Entity common stock, shares outstanding		81,760,667
Common Class D
Class of Stock [Line Items]
Entity common stock, shares outstanding		42,738,750

Consolidated Statements of Oper

Consolidated Statements of Operations - Unaudited - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Operating Revenues
Total operating revenues	$ 380	$ 329	$ 617	$ 587
Operating Costs and Expenses
Cost of operations, exclusive of depreciation, amortization and accretion shown separately below	107	87	217	180
Depreciation, amortization and accretion	128	99	256	201
General and administrative	10	12	20	21
Transaction and integration costs	1	0	3	1
Development costs	1	1	2	2
Total operating costs and expenses	247	199	498	405
Operating Income	133	130	119	182
Other Income (Expense)
Equity in earnings of unconsolidated affiliates	8	16	12	3
Gain on sale of unconsolidated affiliate	0	49	0	49
Other income, net	1	0	2	2
Loss on debt extinguishment	0	0	(42)	(3)
Interest expense	(103)	(93)	(148)	(260)
Total other expense, net	(94)	(28)	(176)	(209)
Income (Loss) Before Income Taxes	39	102	(57)	(27)
Income tax expense (benefit)	7	26	(13)	4
Net Income (Loss)	32	76	(44)	(31)
Less: (Loss) income attributable to noncontrolling interests and redeemable interests	(3)	29	(82)	(49)
Net Income Attributable to Clearway Energy, Inc.	35	47	38	18
Common Class A
Other Income (Expense)
Net Income Attributable to Clearway Energy, Inc.	$ 10	$ 14	$ 11	$ 6
Earnings Per Share Attributable to Clearway Energy, Inc. Class A and Class C Common Stockholders
Weighted average number of common shares outstanding - basic (in shares)	35	35	35	35
Weighted average number of common shares outstanding - diluted (in shares)	35	35	35	35
Earnings (loss) per weighted average common share — basic (in dollars per share)	$ 0.30	$ 0.41	$ 0.32	$ 0.16
Earnings (loss) per weighted average common share — diluted (in dollars per share)	0.30	0.41	0.32	0.16
Common stock, dividends, per share, cash paid (in dollars per share)	$ 0.329	$ 0.210	$ 0.658	$ 0.420
Common Class C
Other Income (Expense)
Net Income Attributable to Clearway Energy, Inc.	$ 25	$ 33	$ 27	$ 13
Earnings Per Share Attributable to Clearway Energy, Inc. Class A and Class C Common Stockholders
Weighted average number of common shares outstanding - basic (in shares)	82	80	82	79
Weighted average number of common shares outstanding - diluted (in shares)	82	80	82	79
Earnings (loss) per weighted average common share — basic (in dollars per share)	$ 0.30	$ 0.41	$ 0.32	$ 0.16
Earnings (loss) per weighted average common share — diluted (in dollars per share)	0.30	0.41	0.32	0.16
Common stock, dividends, per share, cash paid (in dollars per share)	$ 0.329	$ 0.210	$ 0.658	$ 0.420

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - Unaudited - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net Loss	$ 32	$ 76	$ (44)	$ (31)
Other Comprehensive Income (Loss)
Unrealized gain (loss) on derivatives, net of income tax expense (benefit) of $—, $1, $2 and $(1)	0	4	11	(8)
Other comprehensive income (loss)	0	4	11	(8)
Comprehensive Income (Loss)	32	80	(33)	(39)
Less: Comprehensive (loss) income attributable to noncontrolling interests and redeemable interests	(3)	31	(75)	(53)
Comprehensive Income Attributable to Clearway Energy, Inc.	$ 35	$ 49	$ 42	$ 14

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Loss - Unaudited(Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Unrealized loss on derivatives income tax expense (benefit)	$ 0	$ 1	$ 2	$ (1)

Consolidated Balance Sheets - U

Consolidated Balance Sheets - Unaudited - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Current Assets
Cash and cash equivalents	$ 138	$ 268
Restricted cash	332	197
Accounts receivable — trade	203	143
Accounts receivable — affiliates	1	0
Inventory	43	42
Prepayments and other current assets	50	58
Total current assets	767	708
Property, plant and equipment	7,537	7,217
Other Assets
Equity investments in affiliates	639	741
Intangible assets for power purchase agreements, net	2,188	1,231
Other intangible assets, net	136	139
Derivative instruments	4	1
Deferred income taxes	117	104
Right of use assets, net	349	337
Other non-current assets	144	114
Total other assets	3,577	2,667
Total Assets	11,881	10,592
Current Liabilities
Current portion of long-term debt	518	384
Accounts payable — trade	59	72
Accounts payable — affiliates	14	17
Derivative instruments	44	38
Accrued interest expense	55	44
Accrued expenses and other current liabilities	64	79
Total current liabilities	754	634
Other Liabilities
Long-term debt	7,434	6,585
Derivative instruments	145	135
Long-term lease liabilities	361	345
Other non-current liabilities	184	178
Total non-current liabilities	8,124	7,243
Total Liabilities	8,878	7,877
Commitments and Contingencies
Stockholders' Equity
Preferred stock, $0.01 par value; 10,000,000 shares authorized; none issued	0	0
Class A, Class B, Class C and Class D common stock, $0.01 par value; 3,000,000,000 shares authorized (Class A 500,000,000, Class B 500,000,000, Class C 1,000,000,000, Class D 1,000,000,000); 201,836,708 shares issued and outstanding (Class A 34,599,645, Class B 42,738,750, Class C 81,759,563, Class D 42,738,750) at June 30, 2021 and 201,635,990 shares issued and outstanding (Class A 34,599,645, Class B 42,738,750, Class C 81,558,845, Class D 42,738,750) at December 31, 2020	1	1
Additional paid-in capital	1,848	1,922
Accumulated deficit	(46)	(84)
Accumulated other comprehensive loss	(9)	(14)
Noncontrolling interest	1,209	890
Total Stockholders' Equity	3,003	2,715
Total Liabilities and Stockholders' Equity	$ 11,881	$ 10,592

Consolidated Balance Sheets -_2

Consolidated Balance Sheets - Unaudited(Parenthetical) - $ / shares	Jun. 30, 2021	Dec. 31, 2020
Par value - preferred stock (in usd per share)	$ 0.01	$ 0.01
Preferred stock, authorized (in shares)	10,000,000	10,000,000
Preferred stock issued (in shares)	0	0
Common stock, authorized (in shares)	3,000,000,000	3,000,000,000
Common stock issued (in shares)	201,836,708	201,635,990
Common stock outstanding (in shares)	201,836,708	201,635,990
Common Class A
Common stock, par value (in usd per share)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	500,000,000	500,000,000
Common stock issued (in shares)	34,599,645	34,599,645
Common stock outstanding (in shares)	34,599,645	34,599,645
Common Class B
Common stock, par value (in usd per share)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	500,000,000	500,000,000
Common stock issued (in shares)	42,738,750	42,738,750
Common stock outstanding (in shares)	42,738,750	42,738,750
Common Class C
Common stock, par value (in usd per share)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	1,000,000,000	1,000,000,000
Common stock issued (in shares)	81,759,563	81,558,845
Common stock outstanding (in shares)	81,759,563	81,558,845
Common Class D
Common stock, par value (in usd per share)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	1,000,000,000	1,000,000,000
Common stock issued (in shares)	42,738,750	42,738,750
Common stock outstanding (in shares)	42,738,750	42,738,750

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - Unaudited - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash Flows from Operating Activities
Net Loss	$ (44)	$ (31)
Adjustments to reconcile net loss to net cash provided by operating activities:
Equity in earnings of unconsolidated affiliates	(12)	(3)
Distributions from unconsolidated affiliates	16	10
Depreciation, amortization and accretion	256	201
Amortization of financing costs and debt discounts	7	8
Amortization of intangibles	70	45
Loss on debt extinguishment	42	3
Reduction (increase) in carrying amount of right-of-use assets	5	(1)
Gain on sale of unconsolidated affiliate	0	(49)
Changes in deferred income taxes	(13)	4
Changes in derivative instruments	20	100
Cash used in changes in other working capital
Changes in prepaid and accrued liabilities for tolling agreements	(76)	(77)
Changes in other working capital	(30)	(26)
Net Cash Provided by Operating Activities	241	184
Cash Flows from Investing Activities
Acquisitions, net of cash acquired	(211)	0
Acquisition of Drop Down Asset	(132)	0
Consolidation of DGPV Holdco 3 LLC	0	17
Capital expenditures	(93)	(83)
Asset purchase from affiliate	(21)	0
Return of investment from unconsolidated affiliates	20	23
Investments in unconsolidated affiliates	0	(10)
Cash receipts from notes receivable	4	0
Proceeds from sale of assets	0	90
Other	13	3
Net Cash (Used in) Provided by Investing Activities	(420)	40
Cash Flows from Financing Activities
Net contributions from noncontrolling interests	265	154
Buyout of Repowering Partnership II LLC noncontrolling interest	0	(70)
Net proceeds from the issuance of common stock	0	38
Payments of dividends and distributions	(132)	(84)
Payments of debt issuance costs	(13)	(2)
Proceeds from the revolving credit facility	300	265
Payments for the revolving credit facility	(233)	(265)
Proceeds from the issuance of long-term debt	1,016	286
Payments for long-term debt	(1,028)	(547)
Other	9	0
Net Cash Provided by (Used in) Financing Activities	184	(225)
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	5	(1)
Cash, Cash Equivalents and Restricted Cash at beginning of period	465	417
Cash, Cash Equivalents and Restricted Cash at end of period	$ 470	$ 416

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - Unaudited - USD ($) $ in Millions	Total	DGPV Funds	Aqua Cliente Acquisition	Rattlensake Down	CEG	Tax Equity Investors	Preferred Stock	Common Stock	Additional Paid-In Capital	Additional Paid-In CapitalCEG	Accumulated Deficit	Accumulated Other Comprehensive Loss	Noncontrolling Interest	Noncontrolling InterestDGPV Funds	Noncontrolling InterestAqua Cliente Acquisition	Noncontrolling InterestRattlensake Down	Noncontrolling InterestCEG	Noncontrolling InterestTax Equity Investors
Balance at beginning of period at Dec. 31, 2019	$ 2,263						$ 0	$ 1	$ 1,936		$ (72)	$ (15)	$ 413
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(107)										(29)		(78)
Unrealized gain on derivatives, net of tax	(12)											(6)	(6)
Contributions from CEG, cash					$ 4	$ 150											$ 4	$ 150
Distributions to tax equity investors, non-cash						(2)												(2)
Net proceeds from the issuance of common stock under the ATM Program	10								10
Dividends to common stockholders and distributions to CEG					(42)					$ (24)							(18)
Balance at end of period at Mar. 31, 2020	2,264						0	1	1,922		(101)	(21)	463
Balance at beginning of period at Dec. 31, 2019	2,263						0	1	1,936		(72)	(15)	413
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(31)
Balance at end of period at Jun. 30, 2020	2,232						0	1	1,934		(54)	(19)	370
Balance at beginning of period at Mar. 31, 2020	2,264						0	1	1,922		(101)	(21)	463
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	76										47		29
Unrealized gain on derivatives, net of tax	4											2	2
Contributions from CEG, non-cash	8												8
Contributions from CEG, cash	2												2
Distributions to tax equity investors, non-cash	(3)												(3)
Decrease from consolidation and buyout of Noncontrolling interest	(70)	$ (43)											(70)	$ (43)
Stock-based compensation	1								1
Non-cash adjustments for change in tax basis	7								7
Net proceeds from the issuance of common stock under the ATM Program	28								28
Dividends to common stockholders and distributions to CEG	(42)								(24)				(18)
Balance at end of period at Jun. 30, 2020	2,232						0	1	1,934		(54)	(19)	370
Balance at beginning of period at Dec. 31, 2020	2,715						0	1	1,922		(84)	(14)	890
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(78)										3		(81)
Unrealized gain on derivatives, net of tax	11											4	7
Contributions from CEG, non-cash					27												27
Contributions from CEG, cash					103	126											103	126
Agua Caliente acquisition			$ 273												$ 273
Decrease from consolidation and buyout of Noncontrolling interest				$ (118)												$ (118)
Non-cash adjustments for change in tax basis	2								2
Dividends to common stockholders and distributions to CEG					(66)					(38)							(28)
Balance at end of period at Mar. 31, 2021	2,995						0	1	1,886		(81)	(10)	1,199
Balance at beginning of period at Dec. 31, 2020	2,715						0	1	1,922		(84)	(14)	890
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(44)
Decrease from consolidation and buyout of Noncontrolling interest				$ 1
Balance at end of period at Jun. 30, 2021	3,003						0	1	1,848		(46)	(9)	1,209
Balance at beginning of period at Mar. 31, 2021	2,995						0	1	1,886		(81)	(10)	1,199
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	32										35
Unrealized gain on derivatives, net of tax	0											1	(1)
Contributions from CEG, non-cash					3												3
Contributions from CEG, cash					1	$ 38											1	$ 38
Agua Caliente acquisition	1								1
Decrease from consolidation and buyout of Noncontrolling interest																$ 1
Non-cash adjustments for change in tax basis	(1)								(1)
Dividends to common stockholders and distributions to CEG					$ (66)					$ (38)							$ (28)
Balance at end of period at Jun. 30, 2021	3,003						$ 0	$ 1	$ 1,848		$ (46)	$ (9)	$ 1,209
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Including Rounding Adjustments	$ 31

Nature of Business

Nature of Business	6 Months Ended
Nature of Business	Jun. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Business	Nature of Business Clearway Energy, Inc., together with its consolidated subsidiaries, or the Company, is a publicly-traded energy infrastructure investor in and owner of modern, sustainable and long-term contracted assets across North America. The Company is indirectly owned by Global Infrastructure Partners III. Global Infrastructure Management, LLC is an independent fund manager that invests in infrastructure assets in energy and transport sectors, and Global Infrastructure Partners III is its third equity fund. The Company is sponsored by GIP through GIP's portfolio company, CEG. The Company is one of the largest renewable energy owners in the U.S. with over 4,700 net MW of installed wind and solar generation projects. The Company's over 8,000 net MW of assets also includes approximately 2,500 net MW of environmentally-sound, highly efficient generation facilities as well as a portfolio of district energy systems. Through this environmentally-sound, diversified and primarily contracted portfolio, the Company endeavors to provide its investors with stable and growing dividend income. Substantially all of the Company's generation assets are under long-term contractual arrangements for the output or capacity from these assets. The Company consolidates the results of Clearway Energy LLC through its controlling interest, with CEG's interest shown as non-controlling interest in the financial statements. The holders of the Company's outstanding shares of Class A and Class C common stock are entitled to dividends as declared. CEG receives its distributions from Clearway Energy LLC through its ownership of Clearway Energy LLC Class B and Class D units. From time to time, CEG may also hold shares of the Company's Class A and/or Class C common stock. The Company owns 57.65% of the economic interests of Clearway Energy LLC, with CEG owning 42.35% of the economic interests of Clearway Energy LLC as of June 30, 2021. The following table represents the structure of the Company as of June 30, 2021: Basis of Presentation The accompanying unaudited interim consolidated financial statements have been prepared in accordance with the SEC’s regulations for interim financial information and with the instructions to Form 10-Q. Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. The following notes should be read in conjunction with the accounting policies and other disclosures as set forth in the notes to the consolidated financial statements included in the Company's 2020 Form 10-K. Interim results are not necessarily indicative of results for a full year. In the opinion of management, the accompanying unaudited interim consolidated financial statements contain all material adjustments consisting of normal and recurring accruals necessary to present fairly the Company's consolidated financial position as of June 30, 2021, and results of operations, comprehensive income (loss) and cash flows for the six months ended June 30, 2021 and 2020.

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
Summary of Significant Accounting Policies	Jun. 30, 2021
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Use of Estimates The preparation of consolidated financial statements in accordance with GAAP requires management to make estimates and assumptions. These estimates and assumptions impact the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities as of the date of the consolidated financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could be different from these estimates. Cash and Cash Equivalents, and Restricted Cash Cash and cash equivalents include highly liquid investments with an original maturity of three months or less at the time of purchase. Cash and cash equivalents held at project subsidiaries was $125 million and $149 million as of June 30, 2021 and December 31, 2020, respectively. The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the consolidated balance sheets that sum to the total of the same such amounts shown in the statements of cash flows: June 30, 2021 December 31, 2020 (In millions) Cash and cash equivalents $ 138 $ 268 Restricted cash 332 197 Cash, cash equivalents and restricted cash shown in the statement of cash flows $ 470 $ 465 Restricted cash consists primarily of funds held to satisfy the requirements of certain debt agreements and funds held within the Company's projects that are restricted in their use. As of June 30, 2021, these restricted funds were comprised of $131 million designated to fund operating expenses, approximately $38 million designated for current debt service payments, and $130 million restricted for reserves including debt service, performance obligations and other reserves, as well as capital expenditures. The remaining $33 million is held in distribution reserve accounts. In 2020, the members of the partnerships holding the Oahu Solar and Kawailoa Solar projects submitted applications to the state of Hawaii for refundable tax credits based on the cost of construction of the projects. In April 2021, the members of the partnerships contributed their respective portions of the tax credits in the amount of $49 million to the Oahu Solar and Kawailoa project companies, which is reflected in restricted cash on the Company's consolidated balance sheet with an offsetting adjustment to noncontrolling interests. In accordance with the projects' related agreements, the cash will be held in a restricted account and utilized to offset future invoiced amounts under the projects' PPAs. Accumulated Depreciation, Accumulated Amortization The following table presents the accumulated depreciation included in the property, plant and equipment, net, and accumulated amortization included in intangible assets, net, respectively, as of June 30, 2021 and December 31, 2020: June 30, 2021 December 31, 2020 (In millions) Property, Plant and Equipment Accumulated Depreciation $ 2,573 $ 2,323 Intangible Assets Accumulated Amortization 556 487 Dividends to Class A and Class C common stockholders The following table lists the dividends paid on the Company's Class A common stock and Class C common stock during the six months ended June 30, 2021: Second Quarter 2021 First Quarter 2021 Dividends per Class A share $ 0.329 $ 0.324 Dividends per Class C share $ 0.329 $ 0.324 Dividends on the Class A common stock and Class C common stock are subject to available capital, market conditions, and compliance with associated laws, regulations and other contractual obligations. The Company expects that, based on current circumstances, comparable cash dividends will continue to be paid in the foreseeable future. On July 23, 2021, the Company declared quarterly dividends on its Class A common stock and Class C common stock of $0.3345 per share payable on September 15, 2021 to stockholders of record as of September 1, 2021. Noncontrolling Interests Clearway Energy LLC Distributions to CEG The following table lists distributions paid to CEG during the six months ended June 30, 2021 on Clearway Energy LLC's Class B and D units: Second Quarter 2021 First Quarter 2021 Distributions per Class B Unit $ 0.329 $ 0.324 Distributions per Class D Unit $ 0.329 $ 0.324 On July 23, 2021, Clearway Energy LLC declared a distribution on its Class B and Class D units of $0.3345 per unit payable on September 15, 2021 to unit holders of record as of September 1, 2021. Revenue Recognition Revenue from Contracts with Customers The Company applies the guidance in ASC 606, Revenue from Contracts with Customers, or Topic 606, when recognizing revenue associated with its contracts with customers. The Company's policies with respect to its various revenue streams are detailed below. In general, the Company applies the invoicing practical expedient to recognize revenue for the revenue streams detailed below, except in circumstances where the invoiced amount does not represent the value transferred to the customer. Thermal Revenues Steam and chilled water revenue is recognized as the Company transfers the product to the customer, based on customer usage as determined by meter readings taken at month-end. Some locations read customer meters throughout the month and recognize estimated revenue for the period between meter read date and month-end. For thermal contracts, the Company’s performance obligation to deliver steam and chilled water is satisfied over time and revenue is recognized based on the invoiced amount. The Thermal Business subsidiaries collect, and remit state and local taxes associated with sales to their customers, as required by governmental authorities. These taxes are presented on a net basis in the income statement. As contracts for steam and chilled water are long-term contracts, the Company has performance obligations under these contracts that have not yet been satisfied. These performance obligations have transaction prices that are both fixed and variable, and that vary based on the contract duration, customer type, inception date and other contract-specific factors. For the fixed price contracts, the Company cannot accurately estimate the amount of its unsatisfied performance obligations as it will vary based on customer usage, which will depend on factors such as weather and customer activity. Power Purchase Agreements, or PPAs The majority of the Company’s revenues are obtained through PPAs or other contractual agreements. Energy, capacity and where applicable, renewable attributes, from the majority of the Company’s renewable energy assets and certain conventional energy plants is sold through long-term PPAs and tolling agreements to a single counterparty, which is often a utility or commercial customer. The majority of these PPAs are accounted for as leases as the Company retained its historical lease assessments and classification upon adoption of ASC 842. ASC 842 requires the minimum lease payments received to be amortized over the term of the lease and contingent rentals are recorded when the achievement of the contingency becomes probable. Judgment is required by management in determining the economic life of each generating facility, in evaluating whether certain lease provisions constitute minimum payments or represent contingent rent and other factors in determining whether a contract contains a lease and whether the lease is an operating lease or capital lease. Certain of these leases have no minimum lease payments and all of the rental income under these leases is recorded as contingent rent on an actual basis when the electricity is delivered. Renewable Energy Credits, or RECs Renewable energy credits, or RECs, are usually sold through long-term PPAs. Revenue from the sale of self-generated RECs is recognized when the related energy is generated and simultaneously delivered even in cases where there is a certification lag as it has been deemed to be perfunctory. In a bundled contract to sell energy, capacity and/or self-generated RECs, all performance obligations are deemed to be delivered at the same time and hence, timing of recognition of revenue for all performance obligations is the same and occurs over time. In such cases, it is often unnecessary to allocate transaction price to multiple performance obligations. Disaggregated Revenues The following tables represent the Company’s disaggregation of revenue from contracts with customers along with the reportable segment for each category for the three and six months ended June 30, 2021 and 2020, respectively: Three months ended June 30, 2021 (In millions) Conventional Generation Renewables Thermal Total Energy revenue (a) $ 2 $ 261 $ 29 $ 292 Capacity revenue (a) 113 — 15 128 Contract amortization (6) (30) (1) (37) Other revenue — 22 6 28 Mark-to-market for economic hedges — (31) — (31) Total operating revenue 109 222 49 380 Less: Mark-to-market for economic hedges — 31 — 31 Less: Lease revenue (115) (228) — (343) Less: Contract amortization 6 30 1 37 Total revenue from contracts with customers $ — $ 55 $ 50 $ 105 (a) The following amounts of energy and capacity revenue relate to leases and are accounted for under ASC 842: (In millions) Conventional Generation Renewables Thermal Total Energy revenue $ 2 $ 228 $ — $ 230 Capacity revenue 113 — — 113 Total $ 115 $ 228 $ — $ 343 Six months ended June 30, 2021 (In millions) Conventional Generation Renewables Thermal Total Energy revenue (a) $ 3 $ 387 $ 58 $ 448 Capacity revenue (a) 220 — 28 248 Contract amortization (12) (55) (2) (69) Other revenue — 31 14 45 Mark-to-market for economic hedges — (55) — (55) Total operating revenue 211 308 98 617 Less: Mark-to-market for economic hedges — 55 — 55 Less: Lease revenue (223) (373) (1) (597) Less: Contract amortization 12 55 2 69 Total revenue from contracts with customers $ — $ 45 $ 99 $ 144 (a) The following amounts of energy and capacity revenue relate to leases and are accounted for under ASC 842: (In millions) Conventional Generation Renewables Thermal Total Energy revenue $ 3 $ 373 $ 1 $ 377 Capacity revenue 220 — — 220 Total $ 223 $ 373 $ 1 $ 597 Three months ended June 30, 2020 (In millions) Conventional Generation Renewables Thermal Total Energy revenue (a) $ 1 $ 195 $ 22 $ 218 Capacity revenue (a) 112 — 12 124 Contract amortization (6) (16) — (22) Other revenue — 4 8 12 Mark-to-market for economic hedges — (3) — (3) Total operating revenue 107 180 42 329 Less: Mark-to-market for economic hedges — 3 — 3 Less: Lease revenue (113) (181) — (294) Less: Contract amortization 6 16 — 22 Total revenue from contracts with customers $ — $ 18 $ 42 $ 60 (a) The following amounts of energy and capacity revenue relate to leases and are accounted for under ASC 842: (In millions) Conventional Generation Renewables Thermal Total Energy revenue $ 1 $ 181 $ — $ 182 Capacity revenue 112 — — 112 Total $ 113 $ 181 $ — $ 294 Six months ended June 30, 2020 (In millions) Conventional Generation Renewables Thermal Total Energy revenue (a) $ 3 $ 320 $ 50 $ 373 Capacity revenue (a) 219 — 26 245 Contract amortization (12) (31) (1) (44) Other revenue — 6 15 21 Mark-to-market for economic hedges — (8) — (8) Total operating revenue 210 287 90 587 Less: Mark-to-market for economic hedges — 8 — 8 Less: Lease revenue (222) (296) (1) (519) Less: Contract amortization 12 31 1 44 Total revenue from contracts with customers $ — $ 30 $ 90 $ 120 (a) The following amounts of energy and capacity revenue relate to leases and are accounted for under ASC 842: (In millions) Conventional Generation Renewables Thermal Total Energy revenue $ 3 $ 296 $ 1 $ 300 Capacity revenue 219 — — 219 Total $ 222 $ 296 $ 1 $ 519 Contract Amortization Assets and liabilities recognized from power sales agreements assumed through acquisitions related to the sale of electric capacity and energy in future periods for which the fair value has been determined to be significantly less (more) than market are amortized to revenue over the term of each underlying contract based on actual generation and/or contracted volumes or on a straight-line basis, where applicable. Contract Balances The following table reflects the contract assets and liabilities included on the Company’s balance sheet as of June 30, 2021 and December 31, 2020: June 30, 2021 December 31, 2020 (In millions) Accounts receivable, net - Contracts with customers $ 66 $ 57 Accounts receivable, net - Leases 137 86 Total accounts receivable, net $ 203 $ 143 Recently Adopted Accounting Standards In March 2020, the FASB issued ASU No. 2020-4, Facilitation of the Effects of Reference Rate Reform on Financial Reporting. The amendments provide for optional expedients and exceptions for applying GAAP to contracts, hedging relationships and other transactions affected by reference rate reform if certain criteria is met. These amendments apply only to contracts that reference LIBOR or another reference rate expected to be discontinued because of reference rate reform. The guidance is effective for all entities as of March 12, 2020 through December 31, 2022. The Company intends to apply the amendments to all its eligible contract modifications where applicable during the reference rate reform period. In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes. The amendments in this ASU simplify the accounting for income taxes by removing certain exceptions to the general principles in Topic 740, Income Taxes. The amendments also improve consistent application of and simplify GAAP for other areas of Topic 740 by clarifying and amending existing guidance. The Company adopted the guidance as of January 1, 2021, with no material impact to the financial statements.

Acquisition and Dispositions

Acquisition and Dispositions	6 Months Ended
Acquisition and Dispositions	Jun. 30, 2021
Business Combination and Asset Acquisition [Abstract]
Acquisition and Dispositions	Acquisitions and Dispositions 2021 Acquisitions Rattlesnake Drop Down — On January 12, 2021, the Company acquired CEG's equity interest and a third party investor's minority interest in CWSP Rattlesnake Holding LLC for $132 million. CWSP Rattlesnake Holding LLC indirectly consolidates the Rattlesnake wind project, a 160 MW wind facility with 144 MW of deliverable capacity in Adams County, Washington, as further described in Note 4, Investments Accounted for by the Equity Method and Variable Interest Entities. The project has a 20-year PPA with Avista Corporation, which began when the facility reached commercial operations in December 2020. The Rattlesnake operations are included in the Company's Renewables segment. The acquisition was determined to be an asset acquisition and not a business combination, therefore the Company consolidated the financial information for Rattlesnake on a prospective basis. The membership interests acquired by the Company relate to interests under common control by GIP and were recorded at historical cost. The difference between the cash paid of $132 million and the historical cost of the Company's acquired interests of $14 million was recorded as an adjustment to CEG's noncontrolling interest balance. The following is a summary of assets and liabilities transferred in connection with the acquisition as of January 12, 2021: (In millions) Rattlesnake Current Assets $ 8 Property, plant and equipment 200 Right-of-use asset 12 Total assets acquired 220 Debt (a) 176 Long-term lease liabilities 12 Other current and non-current liabilities 18 Total liabilities assumed 206 Net assets acquired $ 14 (a) Repaid at acquisition date utilizing $107 million contributed by tax equity investor and $103 million contributed by CEG, both recorded as contributions in noncontrolling interest. Of the $210 million contributed, $176 million was utilized to pay down the acquired debt, $29 million was utilized to fund project reserve accounts and $5 million was utilized to pay associated fees. Agua Caliente Acquisition — On February 3, 2021, the Company acquired Agua Caliente Borrower 1 LLC from NRG Energy, Inc. for $202 million. Agua Caliente Borrower 1 LLC indirectly owns a 35% equity interest in Agua Caliente, a 290 MW solar project located in Dateland, Arizona in which the Company previously owned a 16% equity interest. The project has a 25-year PPA with PG&E, with approximately 19 years remaining under the agreement. Following the close of the transaction, the Company owns a 51% equity interest in Agua Caliente and consolidates Agua Caliente. The Agua Caliente operations are included in the Company's Renewables segment. The acquisition was determined to be an asset acquisition and the cash consideration of $202 million, net of restricted cash acquired of $91 million, represented a net cash outflow of $111 million, which was allocated to the fair value of the assets and liabilities acquired on the acquisition date. A third party investor holds the remaining 49% equity interest in Agua Caliente, which is reflected in noncontrolling interest and was valued at historical carrying amount increased for the incremental fair value determined at the acquisition date. The following is a summary of assets and liabilities acquired in connection with the acquisition as of February 3, 2021: (In millions) Agua Caliente Restricted cash $ 91 Property, plant and equipment 154 Intangible asset for power purchase agreement 1,022 Other currents assets 9 Total assets acquired 1,276 Accounts payable and other current liabilities 5 Debt 716 Total liabilities assumed 721 Noncontrolling interest 273 Equity method investment removed (80) Net assets acquired $ 202 Fair value measurement s The fair values of the property, plant and equipment, and intangible assets at the acquisition date were measured primarily based on significant inputs that are not observable in the market and thus represent a Level 3 measurement as defined in ASC 820, Fair Value Measurement. Significant inputs were as follows: Property, plant and equipment — The estimated fair values were determined primarily based on an income method using discounted cash flows and validated using a cost approach based on the replacement cost of the assets less economic obsolescence. The income approach was applied by determining the enterprise value for each acquired entity and subtracting the fair value of the intangible assets and working capital to determine the implied value of the tangible fixed assets. This methodology was primarily relied upon as the forecasted cash flows incorporate the specific attributes of each asset including age, useful life, equipment condition, and technology. The income approach also allows for an accurate reflection of current and expected market dynamics such as supply and demand and the regulatory environment as of the acquisition date. Intangible assets — The fair value of the PPA acquired was determined utilizing a variation of the income approach where the incremental future cash flows resulting from the acquired PPA compared to the cash flows based on current market prices were discounted to present value at the weighted average cost of debt of the utility off-taker, as the PPA was determined to be a debt-like instrument for the off-taker. The values were corroborated with available market data. The PPA value will be amortized over a period of 19 years. Long-term debt — The fair value of the long-term debt was determined by discounting future cash flows at current interest rates for similar instruments with equivalent credit quality. Noncontrolling interest — The Company recorded the noncontrolling interest utilizing the cost accumulation model, as the acquisition was an asset acquisition, which maintained the carrying value for the pre-existing equity, with the value increased incrementally based on the value of the Company's newly acquired interest. Mt. Storm Wind Acquisition — On April 23, 2021, the Company acquired 100% of the equity interests in NedPower Mount Storm LLC, or Mt. Storm, from Castleton Commodities International for approximately $96 million before working capital and purchase price adjustments in the net amount of $4 million, representing a total cash outflow of $100 million. Mt. Storm is a 264 MW wind project located in Grant County, West Virginia. Mt. Storm has a 10 year energy hedge with an investment-grade counterparty. The acquisition was determined to be an asset acquisition and the purchase price was allocated to the fair value of the assets acquired and liabilities assumed on the acquisition date as follows: (In millions) Mt. Storm Current Assets $ 3 Property, plant and equipment 108 Intangible asset 2 Total assets acquired 113 Accounts payable and other liabilities 4 Derivative instruments 9 Total liabilities assumed 13 Net assets acquired $ 100 Fair value measurement s The fair values of the property, plant and equipment, derivative instrument and intangible asset at the acquisition date were measured primarily based on significant inputs that are not observable in the market and thus represent a Level 3 measurement as defined in ASC 820, Fair Value Measurement. Property, plant and equipment — The estimated fair values of property, plant and equipment were determined primarily based on an income method using discounted cash flows. Intangible assets — The estimated fair value of the intangible asset was using a market approach based on quoted prices of renewable energy credits in the applicable market. Derivative instruments — The estimated fair value of the derivative instruments was determined based on the discounted cash flows associated with the acquired commodity contract. 2020 Dispositions Sale of RPV Holdco 1 LLC — On May 14, 2020, the Company sold its interests in RPV Holdco 1 LLC, or RPV Holdco, to Spruce Power for net proceeds of approximately $75 million. The Company previously accounted for its interest in RPV Holdco as an equity method investment. The sale of the investment resulted in a gain of approximately $49 million. Sale of Energy Center Dover LLC and Energy Center Smyrna LLC Assets — On March 3, 2020, the Company, through Clearway Thermal LLC, sold 100% of its interests in Energy Center Dover LLC and Energy Center Smyrna LLC to DB Energy Assets, LLC for cash proceeds of approximately $15 million.

Investments Accounted for by th

Investments Accounted for by the Equity Method and Variable Interest Entities	6 Months Ended
	Jun. 30, 2021
Equity Method Investments and Joint Ventures [Abstract]
Investments Accounted for by the Equity Method and Variable Interest Entities	Investments Accounted for by the Equity Method and Variable Interest Entities Entities that are Consolidated The Company has a controlling financial interest in certain entities which have been identified as VIEs under ASC 810, Consolidation . These arrangements are primarily related to tax equity arrangements entered into with third parties in order to monetize certain tax attributes associated with wind and solar facilities, as further described under Item 15 — Note 5, Investments Accounted for by the Equity Method and Variable Interest Entities, to the consolidated financial statements included in the Company's 2020 Form 10-K. Summarized financial information for the Company's consolidated VIEs consisted of the following as of June 30, 2021: (In millions) Alta TE Holdco Buckthorn Renewables, LLC DGPV Funds (a) Kawailoa Partnership Langford TE Partnership LLC Lighthouse Renewable Holdco LLC Other current and non-current assets $ 59 $ 4 $ 96 $ 42 $ 15 $ 41 Property, plant and equipment 344 206 611 138 135 437 Intangible assets 218 — 16 — 2 — Total assets 621 210 723 180 152 478 Current and non-current liabilities 38 10 77 106 17 126 Total liabilities 38 10 77 106 17 126 Noncontrolling interest 26 51 4 51 74 313 Net assets less noncontrolling interests $ 557 $ 149 $ 642 $ 23 $ 61 $ 39 (a) DGPV Funds is comprised of DGPV Fund 2 LLC, Clearway & EFS Distributed Solar LLC, DGPV Fund 4 LLC, Golden Puma Fund LLC, Renew Solar CS4 Fund LLC and Chestnut Fund LLC. (In millions) Oahu Pinnacle Repowering Partnership LLC Rattlesnake TE Holdco LLC Rosie TargetCo LLC Wildorado TE Holdco Other (a) Other current and non-current assets $ 50 $ 12 $ 31 $ 27 $ 21 $ 16 Property, plant and equipment 175 100 196 255 232 178 Intangible assets — 19 — — — 1 Total assets 225 131 227 282 253 195 Current and non-current liabilities 117 102 21 101 18 44 Total liabilities 117 102 21 101 18 44 Noncontrolling interest 35 27 98 147 127 99 Net assets less noncontrolling interests $ 73 $ 2 $ 108 $ 34 $ 108 $ 52 (a) Other is comprised of Crosswind Transmission, LLC, Hardin Hilltop Wind LLC, Elbow Creek TE Holdco and Spring Canyon TE Holdco projects. The discussion below describes material changes to VIEs during the six months ended June 30, 2021. Rattlesnake TE Holdco LLC — As described in Note 3, Acquisitions and Dispositions , on January 12, 2021, the Company acquired CEG's equity interest and a third party investor's minority interest in CWSP Rattlesnake Holding LLC for $132 million. CWSP Rattlesnake Holding LLC owns Rattlesnake Class B LLC, which owns the Class B membership interests in Rattlesnake TE Holdco LLC, which is a VIE. Rattlesnake Class B LLC is the primary beneficiary and managing member and consolidates its interest in Rattlesnake TE Holdco LLC, which owns the Rattlesnake wind project. Subsequent to the acquisition, on January 12, 2021 the third party tax equity investor contributed $107 million into Rattlesnake TE Holdco LLC in exchange for the Class A membership interests. The proceeds from the tax equity contribution along with cash contributed by CEG were used to repay a portion of the $176 million of the outstanding principal under the Rattlesnake Class B LLC credit facility. The Company utilizes the HLBV method to determine the net income or loss allocated to tax equity noncontrolling interest. Pinnacle Repowering Partnership LL C — On February 26, 2021, the Company entered into an amended agreement with CWSP Pinnacle Holding LLC, an indirect subsidiary of CEG, with respect to Pinnacle Repowering Partnership LLC in order to facilitate the repowering of the Pinnacle wind project, a 55 MW wind facility located in Mineral County, West Virginia. On March 10, 2021, the Company contributed its interest in the Pinnacle wind project to Pinnacle Repowering Partnership LLC concurrent with entering into a financing agreement as further described in Note 7, Long-term Debt . The Company owns 100% of the Class A membership interests in Pinnacle Repowering Partnership LLC, which is a VIE, and the Company consolidates its interest as the primary beneficiary and managing member. CWSP Pinnacle Holding LLC owns 100% of the Class B membership interests in Pinnacle Repowering Partnership LLC and is entitled to allocations of 15% of the cash distributions from the partnership. On March 10, 2021, CWSP Pinnacle Holding LLC contributed $27 million in equipment to the partnership, which was a transfer of assets under common control and recorded at historical cost in property, plant and equipment, with a corresponding non-cash contribution in Pinnacle Repowering Partnership LLC's noncontrolling interests. Additionally, on March 10, 2021, the Pinnacle wind project acquired equipment from CEG for $21 million in cash consideration. Entities that are not Consolidated The Company has interests in entities that are considered VIEs under ASC 810, but for which it is not considered the primary beneficiary. The Company accounts for its interests in these entities and entities in which it has a significant investment under the equity method of accounting, as further described under Item 15 — Note 5, Investments Accounted for by the Equity Method and Variable Interest Entities , to the consolidated financial statements included in the Company's 2020 Form 10-K. The Company's maximum exposure to loss as of June 30, 2021 is limited to its equity investment in the unconsolidated entities, as further summarized in the table below: Name Economic Interest Investment Balance (In millions) Avenal 50% $ (3) Desert Sunlight 25% 244 Elkhorn Ridge 67% 34 GenConn (a) 50% 88 San Juan Mesa 75% 29 Utah Solar Portfolio (b) 50% 247 $ 639 ( a ) GenConn is a variable interest entity. (b) Economic interest based on cash to be distributed. Four Brothers Solar, LLC, Granite Mountain Holdings, LLC and Iron Springs Holdings, LLC are tax equity structures and VIEs.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	6 Months Ended
Fair Value of Financial Instruments	Jun. 30, 2021
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	Fair Value of Financial Instruments Fair Value Accounting under ASC 820 ASC 820 establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three levels as follows: • Level 1—quoted prices (unadjusted) in active markets for identical assets or liabilities that the Company has the ability to access as of the measurement date. • Level 2—inputs other than quoted prices included within Level 1 that are directly observable for the asset or liability or indirectly observable through corroboration with observable market data. • Level 3—unobservable inputs for the asset or liability only used when there is little, if any, market activity for the asset or liability at the measurement date. In accordance with ASC 820, the Company determines the level in the fair value hierarchy within which each fair value measurement in its entirety falls, based on the lowest level input that is significant to the fair value measurement. For cash and cash equivalents, restricted cash, accounts receivable — trade, accounts payable — trade, current portion of accounts payable — affiliates, accrued expenses and other liabilities, the carrying amounts approximate fair value because of the short-term maturity of those instruments and are classified as Level 1 within the fair value hierarchy. The estimated carrying amounts and fair values of the Company’s recorded financial instruments not carried at fair market value are as follows: As of June 30, 2021 As of December 31, 2020 Carrying Amount Fair Value Carrying Amount Fair Value (In millions) Long-term debt, including current portion (a) $ 8,030 $ 8,006 $ 7,048 $ 7,020 (a) Excludes net debt issuance costs, which are recorded as a reduction to long-term debt on the Company's consolidated balance sheets. The fair value of the Company's publicly-traded long-term debt is based on quoted market prices and is classified as Level 2 within the fair value hierarchy. The fair value of debt securities, non-publicly traded long-term debt and certain notes receivable of the Company are based on expected future cash flows discounted at market interest rates, or current interest rates for similar instruments with equivalent credit quality and are classified as Level 3 within the fair value hierarchy. The following table presents the level within the fair value hierarchy for long-term debt, including current portion as of June 30, 2021 and December 31, 2020: As of June 30, 2021 As of December 31, 2020 Level 2 Level 3 Level 2 Level 3 (In millions) Long-term debt, including current portion $ 2,166 $ 5,840 $ 1,905 $ 5,115 Recurring Fair Value Measurements The Company records its derivative assets and liabilities at fair market value on its consolidated balance sheet. The following table presents assets and liabilities measured and recorded at fair value on the Company's consolidated balance sheets on a recurring basis and their level within the fair value hierarchy: As of June 30, 2021 As of December 31, 2020 Fair Value (a) Fair Value (a) (In millions) Level 2 Level 3 Level 2 Level 3 Derivative assets: Interest rate contracts $ 4 $ — $ 1 $ — Other financial instruments (b) — 24 — 29 Total assets $ 4 $ 24 $ 1 $ 29 Derivative liabilities: Commodity contracts $ — $ 103 $ — $ 44 Interest rate contracts 86 — 129 — Total liabilities $ 86 $ 103 $ 129 $ 44 (a) There were no derivative assets classified as Level 1 or Level 3 and no liabilities classified as Level 1 as of June 30, 2021 and December 31, 2020. (b) SREC contract acquired on November 2, 2020. The following table reconciles the beginning and ending balances for instruments that are recognized at fair value in the condensed consolidated financial statements using significant unobservable inputs: Three months ended June 30, Six months ended June 30, 2021 2020 2021 2020 (In millions) Fair Value Measurement Using Significant Unobservable Inputs (Level 3) Fair Value Measurement Using Significant Unobservable Inputs (Level 3) Beginning balance $ (39) $ (14) $ (15) $ (9) Total losses for the period included in earnings (33) (3) (57) (8) Purchases (9) — (9) — Settlements 2 — 2 — Ending balance $ (79) $ (17) $ (79) $ (17) Change in unrealized losses included in earnings for derivatives and other financial instruments held as of June 30, 2021 $ (33) $ (57) Derivative and Financial Instruments Fair Value Measurements The Company's contracts are non-exchange-traded and valued using prices provided by external sources. The Company uses quoted observable forward prices to value its energy contracts. To the extent that observable forward prices are not available, the quoted prices reflect the average of the forward prices from the prior year, adjusted for inflation. As of June 30, 2021, contracts valued with prices provided by models and other valuation techniques make up 54% of derivative liabilities and 100% of other financial instruments. The Company’s significant positions classified as Level 3 include physical power contracts executed in illiquid markets. The significant unobservable inputs used in developing fair value include illiquid power tenors and location pricing, which is derived by extrapolating pricing as a basis to liquid locations. The tenor pricing and basis spread are based on observable market data when available or derived from historic prices and forward market prices from similar observable markets when not available. The following table quantifies the significant unobservable inputs used in developing the fair value of the Company's Level 3 positions as of June 30, 2021: June 30, 2021 Fair Value Input/Range Assets Liabilities Valuation Technique Significant Unobservable Input Low High Weighted Average (In millions) Power Contracts $ — $ (103) Discounted Cash Flow Forward Market Price (per MWh) 12.56 58.94 25.95 Other Financial Instruments $ 24 $ — Discounted Cash Flow Forecast annual generation levels of certain DG solar facilities 80,872 MWh 129,913 MWh 124,783 MWh The following table provides sensitivity of fair value measurements to increases/(decreases) in significant unobservable inputs as of June 30, 2021: Significant Observable Input Position Change In Input Impact on Fair Value Measurement Forward Market Price Power Buy Increase/(Decrease) Higher/(Lower) Forward Market Price Power Sell Increase/(Decrease) Lower/(Higher) Forecast Generation Levels Sell Increase/(Decrease) Higher/(Lower) The fair value of each contract is discounted using a risk-free interest rate. In addition, a credit reserve is applied to reflect credit risk, which is, for interest rate swaps, calculated based on credit default swaps using the bilateral method. For commodities, to the extent that the net exposure under a specific master agreement is an asset, the Company uses the counterparty’s default swap rate. If the net exposure under a specific master agreement is a liability, the Company uses a proxy of its own default swap rate. For interest rate swaps and commodities, the credit reserve is added to the discounted fair value to reflect the exit price that a market participant would be willing to receive to assume the liabilities or that a market participant would be willing to pay for the assets. As of June 30, 2021, the non-performance reserve was a $9 million gain recorded primarily to total operating revenues in the consolidated statement of operations. It is possible that future market prices could vary from those used in recording assets and liabilities and such variations could be material. Concentration of Credit Risk In addition to the credit risk discussion as disclosed under Item 15 — Note 2, Summary of Significant Accounting Policies , to the consolidated financial statements included in the Company's 2020 Form 10-K, the following item is a discussion of the concentration of credit risk for the Company's financial instruments. Credit risk relates to the risk of loss resulting from non-performance or non-payment by counterparties pursuant to the terms of their contractual obligations. The Company monitors and manages credit risk through credit policies that include: (i) an established credit approval process; (ii) monitoring of counterparties' credit limits on as needed basis; (iii) as applicable, the use of credit mitigation measures such as margin, collateral, prepayment arrangements, or volumetric limits; (iv) the use of payment netting agreements; and (v) the use of master netting agreements that allow for the netting of positive and negative exposures of various contracts associated with a single counterparty. Risks surrounding counterparty performance and credit could ultimately impact the amount and timing of expected cash flows. The Company seeks to mitigate counterparty risk by having a diversified portfolio of counterparties. Counterparty credit exposure includes credit risk exposure under certain long-term agreements, including solar and other PPAs. As external sources or observable market quotes are not available to estimate such exposure, the Company estimates the exposure related to these contracts based on various techniques including, but not limited to, internal models based on a fundamental analysis of the market and extrapolation of observable market data with similar characteristics. A significant portion of these power contracts are with utilities with strong credit quality and public utility commission or other regulatory support. However, such regulated utility counterparties can be impacted by changes in government regulations or adverse financial conditions, which the Company is unable to predict. Certain subsidiaries of the Company sell the output of their facilities to PG&E, a significant counterparty of the Company, under long-term PPAs, and PG&E's credit rating is below investment grade.

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities	6 Months Ended
Derivative Instruments and Hedging Activities	Jun. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities	Derivative Instruments and Hedging Activities This footnote should be read in conjunction with the complete description under Item 15 — Note 7, Accounting for Derivative Instruments and Hedging Activities , to the consolidated financial statements included in the Company's 2020 Form 10-K. Interest Rate Swaps The Company enters into interest rate swap agreements in order to hedge the variability of expected future cash interest payments. As of June 30, 2021, the Company had interest rate derivative instruments on non-recourse debt extending through 2044, a portion of which were designated as cash flow hedges. Under the interest rate swap agreements, the Company pays a fixed rate and the counterparties to the agreements pay a variable interest rate. Energy-Related Commodities As of June 30, 2021, the Company had energy-related derivative instruments extending through 2032. At June 30, 2021, these contracts were not designated as cash flow or fair value hedges. Volumetric Underlying Derivative Transactions The following table summarizes the net notional volume buy/(sell) of the Company's open derivative transactions broken out by commodity as of June 30, 2021 and December 31, 2020: Total Volume June 30, 2021 December 31, 2020 Commodity Units (In millions) Natural Gas MMBtu 1 1 Power MWh (13) (8) Interest Dollars $ 1,486 $ 1,600 Fair Value of Derivative Instruments The following table summarizes the fair value within the derivative instrument valuation on the balance sheet: Fair Value Derivative Assets Derivative Liabilities June 30, 2021 December 31, 2020 June 30, 2021 December 31, 2020 (In millions) Derivatives Designated as Cash Flow Hedges: Interest rate contracts current $ — $ — $ 7 $ 8 Interest rate contracts long-term — — 7 15 Total Derivatives Designated as Cash Flow Hedges $ — $ — $ 14 $ 23 Derivatives Not Designated as Cash Flow Hedges: Interest rate contracts current — — 23 25 Interest rate contracts long-term 4 1 49 81 Commodity contracts current — — 14 5 Commodity contracts long-term — — 89 39 Total Derivatives Not Designated as Cash Flow Hedges 4 1 175 150 Total Derivatives $ 4 $ 1 $ 189 $ 173 The Company has elected to present derivative assets and liabilities on the balance sheet on a trade-by-trade basis and does not offset amounts at the counterparty master agreement level. As of June 30, 2021 and December 31, 2020, there was no outstanding collateral paid or received. The following tables summarize the offsetting of derivatives by counterparty master agreement level as of June 30, 2021 and December 31, 2020: As of June 30, 2021 Gross Amounts of Recognized Assets/Liabilities Derivative Instruments Net Amount Commodity contracts (In millions) Derivative liabilities $ (103) $ — $ (103) Total commodity contracts (103) — (103) Interest rate contracts Derivative assets $ 4 $ (4) $ — Derivative liabilities (86) 4 (82) Total interest rate contracts (82) — (82) Total derivative instruments $ (185) $ — $ (185) As of December 31, 2020 Gross Amounts of Recognized Assets/Liabilities Derivative Instruments Net Amount Commodity contracts (In millions) Derivative liabilities $ (44) $ — $ (44) Total commodity contracts (44) — (44) Interest rate contracts: Derivative assets $ 1 $ — $ 1 Derivative liabilities (129) — (129) Total interest rate contracts (128) — (128) Total derivative instruments $ (172) $ — $ (172) Accumulated Other Comprehensive Loss The following table summarizes the effects on the Company’s accumulated OCL balance attributable to interest rate swaps designated as cash flow hedge derivatives, net of tax: Three months ended June 30, Six months ended June 30, 2021 2020 2021 2020 (In millions) Accumulated OCL beginning balance $ (19) $ (43) $ (30) $ (31) Reclassified from accumulated OCL to income due to realization of previously deferred amounts 2 1 4 3 Mark-to-market of cash flow hedge accounting contracts (2) 3 7 (11) Accumulated OCL ending balance, net of income tax benefit of $4, $7, $4 and $7, respectively (19) (39) (19) (39) Accumulated OCL attributable to noncontrolling interests (10) (20) (10) (20) Accumulated OCL attributable to Clearway Energy, Inc. $ (9) $ (19) $ (9) $ (19) Losses expected to be realized from OCL during the next 12 months, net of income tax benefit of $3 $ (9) $ (9) Amounts reclassified from accumulated OCL into income are recorded to interest expense. Impact of Derivative Instruments on the Statements of Income Gains and losses related to the Company's derivatives are recorded in the consolidated statement of operations as follows: Three months ended June 30, Six months ended June 30, 2021 2020 2021 2020 (In millions) Interest Rate Contracts (Interest expense) $ (11) $ (13) $ 36 $ (92) Commodity Contracts (Mark-to-market for economic hedging activities) (a) (28) (3) (50) (8) (a) Relates to long-term power hedges at Elbow Creek Wind Project LLC, or Elbow Creek, Mesquite Star Special LLC, or Mesquite Star, and NedPower Mount Storm LLC, or Mt. Storm. A portion of the Company’s derivative commodity contracts relates to its Thermal Business for the purchase of fuel/electricity commodities based on the forecasted usage of the thermal district energy centers. Realized gains and losses on these contracts are reflected in the fuel costs that are permitted to be billed to customers through the related customer contracts or tariffs and, accordingly, no gains or losses are reflected in the consolidated statements of operations for these contracts. See Note 5, Fair Value of Financial Instruments , for a discussion regarding concentration of credit risk.

Long-term Debt

Long-term Debt	6 Months Ended
Long-term Debt	Jun. 30, 2021
Debt Disclosure [Abstract]
Long-term Debt	Long-term Debt This note should be read in conjunction with the complete description under Item 15 — Note 10, Long-term Debt, to the consolidated financial statements included in the Company's 2020 Form 10-K. Long-term debt consisted of the following: (In millions, except rates) June 30, 2021 December 31, 2020 June 30, 2021 interest rate % (a) Letters of Credit Outstanding at June 30, 2021 2025 Senior Notes $ — $ 600 5.750 2026 Senior Notes 350 350 5.000 2028 Senior Notes 850 850 4.750 2031 Senior Notes 925 — 3.750 Clearway Energy LLC and Clearway Energy Operating LLC Revolving Credit Facility, due 2023 (b) 67 — L+1.750 88 Project-level debt: Agua Caliente Solar LLC, due 2037 712 — 2.395 - 3.633 44 Alta Wind Asset Management LLC, due 2031 14 14 L+2.625 26 Alta Wind I-V lease financing arrangements, due 2034 and 2035 772 800 5.696 - 7.015 — Alta Wind Realty Investments LLC, due 2031 25 25 7.000 — Borrego, due 2024 and 2038 57 57 Various 4 Buckthorn Solar, due 2025 125 126 L+1.750 23 Carlsbad Energy Holdings LLC, due 2027 156 156 L+1.625 82 Carlsbad Energy Holdings LLC, due 2038 407 407 4.120 — Carlsbad Holdco, due 2038 210 210 4.210 10 CVSR Holdco Notes, due 2037 169 176 4.680 13 CVSR, due 2037 662 675 2.339 - 3.775 — DG-CS Master Borrower LLC, due 2040 462 467 3.510 30 Duquesne, due 2059 95 95 4.620 — El Segundo Energy Center, due 2023 213 250 L+1.875 - L+2.500 138 Energy Center Minneapolis Series D, E, F, G, H Notes, due 2025-2037 327 327 Various — Kawailoa Solar Portfolio LLC, due 2026 80 81 L+1.375 15 Laredo Ridge, due 2028 75 78 L+2.125 9 Marsh Landing, due 2023 129 146 L+2.375 99 NIMH Solar, due 2024 185 191 L+2.00 16 Oahu Solar Holdings LLC, due 2026 88 89 L+1.375 11 Pinnacle Repowering Partnership Holdco LLC, due 2021 90 — L+1.00 2 Rosie Class B LLC, due 2027 80 80 L+1.75 21 Tapestry Wind LLC, due 2031 88 143 L+1.375 11 Utah Solar Holdings, due 2036 284 290 3.590 16 Walnut Creek, due 2023 110 126 L+1.75 103 WCEP Holdings, LLC, due 2023 32 35 L+3.00 — Other 187 199 Various 38 Subtotal project-level debt: 5,834 5,243 Total debt 8,026 7,043 Less current maturities (518) (384) Less net debt issuance costs (78) (79) Add premiums (c) 4 5 Total long-term debt $ 7,434 $ 6,585 (a) As of June 30, 2021, L+ equals 3 month LIBOR plus x%, except Clearway Energy Operating LLC Revolving Credit Facility, due 2023, Marsh Landing, due 2023, Pinnacle Repowering Partnership HoldCo LLC, due 2021, and Walnut Creek, due 2023, where L+ equals 1 month LIBOR plus x%. (b) Applicable rate is determined by the borrower leverage ratio, as defined in the credit agreement. (c) Premiums relate to the 2028 Senior Notes. The financing arrangements listed above contain certain covenants, including financial covenants that the Company is required to be in compliance with during the term of the respective arrangement. As of June 30, 2021, the Company was in compliance with all of the required covenants. The discussion below describes material changes to or additions of long-term debt for the six months ended June 30, 2021. Clearway Energy LLC and Clearway Energy Operating LLC Revolving Credit Facility As of June 30, 2021, the Company had $67 million of borrowings under the revolving credit facility and $88 million in letters of credit outstanding. During the six months ended June 30, 2021, the Company borrowed $300 million under the revolving credit facility, and subsequently repaid $233 million, utilizing cash on hand and proceeds from the issuance of the 2031 Senior Notes as described below. During July 2021, the company repaid the outstanding $67 million balance under the revolving credit facility and as of July 31, 2021, the Company had no loans outstanding under the revolving credit facility and a total of $75 million in letters of credit outstanding. 2031 Senior Notes On March 9, 2021, Clearway Energy Operating LLC completed the sale of $925 million of senior unsecured notes due 2031, or the 2031 Senior Notes. The 2031 Senior Notes bear interest at 3.750% and mature on February 15, 2031. Interest on the 2031 Senior Notes is payable semi-annually on February 15 and August 15 of each year, and interest payments will commence on August 15, 2021. The 2031 Senior Notes are unsecured obligations of Clearway Energy Operating LLC and are guaranteed by Clearway Energy LLC and by certain of Clearway Energy Operating LLC's wholly owned current and future subsidiaries. The net proceeds from the 2031 Senior Notes were used to repurchase the 2025 Senior Notes, as well as to repay amounts outstanding under the Company’s revolving credit facility and for general corporate purposes. 2025 Senior Notes Tender Offer and Redemption On March 9, 2021, the Company completed the repurchase of an aggregate principal amount of $411 million, or 68.6%, of the 2025 Senior Notes outstanding as part of the cash tender offer announced on March 2, 2021. Additionally, $6 million of the 2025 Senior Notes that were subject to guaranteed delivery procedures were subsequently repurchased on March 11, 2021. On March 17, 2021, the Company exercised its right to optionally redeem the remaining principal amount of $183 million that were not validly tendered and purchased in the tender offer, pursuant to the terms of the indenture governing the 2025 Senior Notes. The 2025 Senior Notes repurchased and redeemed in March 2021 were effectuated at a premium of approximately 106% for total consideration of $636 million and, as a result, the Company recorded a loss on extinguishment in the amount of $36 million. The Company recorded an additional $5 million loss on extinguishment to write off the remaining unamortized deferred financing fees related to the 2025 Senior Notes. Project - level Debt Agua Caliente Solar LLC As part of the acquisition of Agua Caliente Borrower 1 LLC and the consolidation of Agua Caliente, as further described in Note 3, Acquisitions and Dispositions , the Company consolidated non-recourse debt of $716 million related to Agua Caliente Solar, LLC on February 3, 2021. The debt consists of a credit agreement with the Federal Financing Bank and accrues interest at fixed rates between 2.395% and 3.633%, which matures in 2037. Pinnacle Repowering Partnership HoldCo LLC

Earnings Per Share

Earnings Per Share	6 Months Ended
Earnings Per Share	Jun. 30, 2021
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share Basic earnings per common share is computed by dividing net income by the weighted average number of common shares outstanding. Shares issued during the year are weighted for the portion of the year that they were outstanding. Diluted earnings per share is computed in a manner consistent with that of basic earnings per share while giving effect to all potentially dilutive common shares that were outstanding during the period. The reconciliation of Clearway Energy, Inc.'s basic and diluted earnings per share is shown in the following tables: Three months ended June 30, 2021 2020 (In millions, except per share data) (a) Common Class A Common Class C Common Class A Common Class C Basic and diluted income per share attributable to Clearway Energy, Inc. common stockholders Net income attributable to Clearway Energy, Inc. $ 10 $ 25 $ 14 $ 33 Weighted average number of common shares outstanding — basic and diluted 35 82 35 80 Earnings per weighted average common share — basic and diluted $ 0.30 $ 0.30 $ 0.41 $ 0.41 (a) Basic and diluted earnings per share might not recalculate due to presenting values in millions rather than whole dollars. Six months ended June 30, 2021 2020 (In millions, except per share data) (a) Common Class A Common Class C Common Class A Common Class C Basic and diluted income per share attributable to Clearway Energy, Inc. common stockholders Net income attributable to Clearway Energy, Inc. $ 11 $ 27 $ 6 $ 13 Weighted average number of common shares outstanding — basic and diluted 35 82 35 79 Earnings per weighted average common share — basic and diluted $ 0.32 $ 0.32 $ 0.16 $ 0.16 (a) Basic and diluted earnings per share might not recalculate due to presenting values in millions rather than whole dollars. The Company had 2 million Common Class C shares related to the outstanding 2020 Convertible Notes that were anti-dilutive and were not included in the computation of the Company's diluted earnings per share for the three and six months ended June 30, 2020. The 2020 Convertible Notes were repaid on June 1, 2020.

Segment Reporting

Segment Reporting	6 Months Ended
Segment Reporting	Jun. 30, 2021
Segment Reporting [Abstract]
Segment Reporting	Segment Reporting Three months ended June 30, 2021 (In millions) Conventional Generation Renewables Thermal Corporate (a) Total Operating revenues $ 109 $ 222 $ 49 $ — $ 380 Cost of operations, exclusive of depreciation, amortization and accretion shown separately below 23 54 31 (1) 107 Depreciation, amortization and accretion 31 89 8 — 128 General and administrative — 1 — 9 10 Transaction and integration costs — — — 1 1 Development costs — — 1 — 1 Operating income (loss) 55 78 9 (9) 133 Equity in earnings of unconsolidated affiliates 2 6 — — 8 Other income, net (1) 1 1 — 1 Interest expense (16) (58) (4) (25) (103) Income (loss) before income taxes 40 27 6 (34) 39 Income tax expense — — — 7 7 Net Income (Loss) $ 40 $ 27 $ 6 $ (41) $ 32 Total Assets $ 2,500 $ 8,617 $ 621 $ 143 $ 11,881 (a) Includes eliminations Three months ended June 30, 2020 (In millions) Conventional Generation Renewables Thermal Corporate Total Operating revenues $ 107 $ 180 $ 42 $ — $ 329 Cost of operations, exclusive of depreciation, amortization and accretion shown separately below 22 39 26 — 87 Depreciation, amortization and accretion 33 59 7 — 99 General and administrative — 1 2 9 12 Development costs — — 1 — 1 Operating income (loss) 52 81 6 (9) 130 Equity in earnings of unconsolidated affiliates 1 15 — — 16 Gain on sale of unconsolidated affiliate — — — 49 49 Interest expense (22) (42) (5) (24) (93) Income before income taxes 31 54 1 16 102 Income tax expense — — — 26 26 Net Income (Loss) $ 31 $ 54 $ 1 $ (10) $ 76 Six months ended June 30, 2021 (In millions) Conventional Generation Renewables Thermal Corporate (a) Total Operating revenues $ 211 $ 308 $ 98 $ — $ 617 Cost of operations, exclusive of depreciation, amortization and accretion shown separately below 50 106 62 (1) 217 Depreciation, amortization and accretion 65 176 15 — 256 General and administrative — 1 1 18 20 Transaction and integration costs — — — 3 3 Development costs — — 2 — 2 Operating income (loss) 96 25 18 (20) 119 Equity in earnings of unconsolidated affiliates 4 8 — — 12 Other income, net — 1 1 — 2 Loss on debt extinguishment — (1) — (41) (42) Interest expense (27) (62) (9) (50) (148) Income (loss) before income taxes 73 (29) 10 (111) (57) Income tax benefit — — — (13) (13) Net Income (Loss) $ 73 $ (29) $ 10 $ (98) $ (44) (a) Includes eliminations Six months ended June 30, 2020 (In millions) Conventional Generation Renewables Thermal Corporate Total Operating revenues $ 210 $ 287 $ 90 $ — $ 587 Cost of operations, exclusive of depreciation, amortization and accretion shown separately below 46 75 59 — 180 Depreciation, amortization and accretion 66 121 14 — 201 General and administrative — 1 3 17 21 Transaction and integration costs — — — 1 1 Development costs — — 2 — 2 Operating income (loss) 98 90 12 (18) 182 Equity in earnings of unconsolidated affiliates 3 — — — 3 Gain on sale of unconsolidated affiliate — — — 49 49 Other income, net — 1 1 — 2 Loss on debt extinguishment — — — (3) (3) Interest expense (52) (151) (10) (47) (260) Income (loss) before income taxes 49 (60) 3 (19) (27) Income tax expense — — — 4 4 Net Income (Loss) $ 49 $ (60) $ 3 $ (23) $ (31)

Income Taxes

Income Taxes	6 Months Ended
Income Taxes	Jun. 30, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Effective Tax Rate The income tax provision consisted of the following: Three months ended June 30, Six months ended June 30, 2021 2020 2021 2020 (In millions, except percentages) Income (loss) before income tax $ 39 $ 102 $ (57) $ (27) Income tax expense 7 26 (13) 4 Effective income tax rate 17.9 % 25.5 % 22.8 % (14.8) % For the three and six months ended June 30, 2021 and 2020 the overall effective tax rate was different than the statutory rate of 21% primarily due to taxable earnings and losses allocated to partners' interest in Clearway Energy LLC, which includes the effects of applying the HLBV method of accounting for book purposes for certain partnerships. For tax purposes, Clearway Energy LLC is treated as a partnership; therefore, the Company and CEG each record their respective share of taxable income or loss. On March 27, 2020 the Coronavirus Aid, Relief, and Economic Security (CARES) Act, or the CARES Act, was signed into law, which includes modifications to the business interest expense disallowance and net operating loss provisions. While the Company utilized previously disallowed interest expense during 2020 as a result of the modifications, the CARES Act did not have a material impact on the consolidated financial statements. The Company will continue to assess the effects of the CARES Act and ongoing government guidance related to COVID-19 that may be issued.

Related Party Transactions

Related Party Transactions	6 Months Ended
Related Party Transactions	Jun. 30, 2021
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions In addition to the transactions and relationships described elsewhere in the notes to the consolidated financial statements, certain subsidiaries of CEG provide services to the Company's project entities. Amounts due to CEG subsidiaries are recorded as accounts payable — affiliates and amounts due to the Company from CEG subsidiaries are recorded as accounts receivable — affiliates in the Company's balance sheet. The disclosures below summarize the Company's material related party transactions with CEG and its subsidiaries that are included in the Company's operating revenues and operating costs. O&M Services Agreements by and between the Company and Clearway Renewable Operation & Maintenance LLC Various wholly-owned subsidiaries of the Company in the Renewables segment are party to administrative services agreements with Clearway Renewable Operation & Maintenance LLC, or RENOM, a wholly-owned subsidiary of CEG, which provides operation and maintenance, or O&M, services to these subsidiaries. The Company incurred total expenses for these services of $14 million and $9 million for the three months ended June 30, 2021 and 2020, respectively. The Company incurred total expenses for these services of $27 million and $18 million for the six months ended June 30, 2021 and 2020, respectively. There was a balance of $10 million due to RENOM as of June 30, 2021 and December 31, 2020. Administrative Services Agreements by and between the Company and CEG Various wholly-owned subsidiaries of the Company are parties to administrative services agreements with Clearway Asset Services and Clearway Solar Asset Management, two wholly-owned subsidiaries of CEG, which provide various administrative services to the Company's subsidiaries. The Company incurred expenses under these agreements of $4 million and $2 million for the three months ended June 30, 2021 and 2020, respectively. The Company incurred expenses under these agreements of $7 million and $4 million for the six months ended June 30, 2021 and 2020, respectively. CEG Master Services Agreements The Company is a party to Master Services Agreements with CEG, or MSAs, pursuant to which CEG and certain of its affiliates or third party service providers provide certain services to the Company, including operational and administrative services, which include human resources, information systems, external affairs, accounting, procurement and risk management services, and the Company provides certain services to CEG, including accounting, internal audit, tax and treasury services, in exchange for the payment of fees in respect of such services. Amounts due to CEG or its subsidiaries related to these MSAs are recorded as accounts payable — affiliates on the Company's consolidated balance sheet. The Company incurred net expenses of $1 million and $0.6 million under these agreements for the three months ended June 30, 2021 and 2020, respectively. The Company incurred net expenses of $2 million and $1.2 million under these agreements for the six months ended June 30, 2021 and 2020, respectively.

Contingencies

Contingencies	6 Months Ended
Contingencies	Jun. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Contingencies	Contingencies This note should be read in conjunction with the complete description under Item 15 — Note 16, Commitments and Contingencies , to the consolidated financial statements included in the Company's 2020 Form 10-K. Contingencies The Company's material legal proceedings are described below. The Company believes that it has valid defenses to these legal proceedings and intends to defend them vigorously. The Company records reserves for estimated losses from contingencies when information available indicates that a loss is probable and the amount of the loss, or range of loss, can be reasonably estimated. As applicable, the Company has established an adequate reserve for the matters discussed below. In addition, legal costs are expensed as incurred. Management assesses such matters based on current information and makes a judgment concerning its potential outcome, considering the nature of the claim, the amount and nature of damages sought, and the probability of success. The Company is unable to predict the outcome of the legal proceedings below or reasonably estimate the scope or amount of any associated costs and potential liabilities. As additional information becomes available, management adjusts its assessment and estimates of such contingencies accordingly. Because litigation is subject to inherent uncertainties and unfavorable rulings or developments, it is possible that the ultimate resolution of the Company's liabilities and contingencies could be at amounts that are different from its currently recorded reserves and that such difference could be material. In addition to the legal proceedings noted below, the Company and its subsidiaries are party to other litigation or legal proceedings arising in the ordinary course of business. In management's opinion, the disposition of these ordinary course matters will not materially adversely affect the Company's consolidated financial position, results of operations, or cash flows. Nebraska Public Power District Litigation On January 11, 2019, Nebraska Public Power District, or NPPD, sent written notice to certain of the Company’s subsidiaries which own the Laredo Ridge and Elkhorn Ridge wind projects alleging an event of default under each of the PPAs between NPPD and the projects. NPPD alleges that the Company moved forward with certain transactions without obtaining the consent of NPPD. NPPD threatened to terminate the applicable PPAs by February 11, 2019 if the alleged default was not cured. The Company filed a motion for a temporary restraining order and preliminary injunction in the U.S. District Court for the District of Nebraska relating to the Laredo Ridge project, and a similar motion in the District Court of Knox County, Nebraska for the Elkhorn Ridge project, to enjoin NPPD from taking any actions related to the PPAs. On February 19, 2019, the U.S. District Court in the Laredo Ridge matter approved a stipulation between the parties to provide for an injunction preventing NPPD from terminating the PPA pending disposition of the litigation. On February 26, 2019, the Knox County District Court approved a similar stipulation relating to the Elkhorn Ridge project. On April 13, 2020, the U.S. District Court granted the wind projects' motion for summary judgment and permanently enjoined NPPD from terminating the PPAs in reliance on the alleged events of default. The U.S. District Court decision was appealed by NPPD on May 11, 2020 and the case in the Knox County District Court remains pending, but has been stayed pending the outcome of the U.S. District Court case. Argument before the U.S. Court of Appeals for the Eight Circuit was held on March 18, 2021. The Company believes the allegations of NPPD are meritless and the Company is vigorously defending its rights under the PPAs. Buckthorn Solar Litigation On October 8, 2019, the City of Georgetown, Texas, or Georgetown, filed a petition in the District Court of Williamson County, Texas naming Buckthorn Westex, LLC, the Company’s subsidiary that owns the Buckthorn Westex solar project, as the defendant, alleging fraud by nondisclosure and breach of contract in connection with the project and the PPA, and seeking (i) rescission and/or cancellation of the PPA, (ii) declaratory judgment that the alleged breaches constitute an event of default under the PPA entitling Georgetown to terminate, and (iii) recovery of all damages, costs of court, and attorneys’ fees. On November 15, 2019, Buckthorn Westex filed an original answer and counterclaims (i) denying Georgetown’s claims, (ii) alleging Georgetown has breached its contracts with Buckthorn Westex by failing to pay amounts due, and (iii) seeking relief in the form of (x) declaratory judgment that Georgetown’s alleged failure to pay amounts due constitute breaches of and an event of default under the PPA and that Buckthorn did not commit any events of default under the PPA, (y) recovery of costs, expenses, interest, and attorneys’ fees, and (z) such other relief to which it is entitled at law or in equity. Buckthorn Westex believes the allegations of Georgetown are meritless, and Buckthorn Westex is vigorously defending its rights under the PPA.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	6 Months Ended
Summary of Significant Accounting Policies (Policies)	Jun. 30, 2021
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited interim consolidated financial statements have been prepared in accordance with the SEC’s regulations for interim financial information and with the instructions to Form 10-Q. Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. The following notes should be read in conjunction with the accounting policies and other disclosures as set forth in the notes to the consolidated financial statements included in the Company's 2020 Form 10-K. Interim results are not necessarily indicative of results for a full year. In the opinion of management, the accompanying unaudited interim consolidated financial statements contain all material adjustments consisting of normal and recurring accruals necessary to present fairly the Company's consolidated financial position as of June 30, 2021, and results of operations, comprehensive income (loss) and cash flows for the six months ended June 30, 2021 and 2020.
Use of Estimates	Use of Estimates The preparation of consolidated financial statements in accordance with GAAP requires management to make estimates and assumptions. These estimates and assumptions impact the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities as of the date of the consolidated financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could be different from these estimates.
Revenue Recognition and Contract Amortization	Revenue Recognition Revenue from Contracts with Customers The Company applies the guidance in ASC 606, Revenue from Contracts with Customers, or Topic 606, when recognizing revenue associated with its contracts with customers. The Company's policies with respect to its various revenue streams are detailed below. In general, the Company applies the invoicing practical expedient to recognize revenue for the revenue streams detailed below, except in circumstances where the invoiced amount does not represent the value transferred to the customer. Thermal Revenues Steam and chilled water revenue is recognized as the Company transfers the product to the customer, based on customer usage as determined by meter readings taken at month-end. Some locations read customer meters throughout the month and recognize estimated revenue for the period between meter read date and month-end. For thermal contracts, the Company’s performance obligation to deliver steam and chilled water is satisfied over time and revenue is recognized based on the invoiced amount. The Thermal Business subsidiaries collect, and remit state and local taxes associated with sales to their customers, as required by governmental authorities. These taxes are presented on a net basis in the income statement. As contracts for steam and chilled water are long-term contracts, the Company has performance obligations under these contracts that have not yet been satisfied. These performance obligations have transaction prices that are both fixed and variable, and that vary based on the contract duration, customer type, inception date and other contract-specific factors. For the fixed price contracts, the Company cannot accurately estimate the amount of its unsatisfied performance obligations as it will vary based on customer usage, which will depend on factors such as weather and customer activity. Power Purchase Agreements, or PPAs The majority of the Company’s revenues are obtained through PPAs or other contractual agreements. Energy, capacity and where applicable, renewable attributes, from the majority of the Company’s renewable energy assets and certain conventional energy plants is sold through long-term PPAs and tolling agreements to a single counterparty, which is often a utility or commercial customer. The majority of these PPAs are accounted for as leases as the Company retained its historical lease assessments and classification upon adoption of ASC 842. ASC 842 requires the minimum lease payments received to be amortized over the term of the lease and contingent rentals are recorded when the achievement of the contingency becomes probable. Judgment is required by management in determining the economic life of each generating facility, in evaluating whether certain lease provisions constitute minimum payments or represent contingent rent and other factors in determining whether a contract contains a lease and whether the lease is an operating lease or capital lease. Certain of these leases have no minimum lease payments and all of the rental income under these leases is recorded as contingent rent on an actual basis when the electricity is delivered. Renewable Energy Credits, or RECs Renewable energy credits, or RECs, are usually sold through long-term PPAs. Revenue from the sale of self-generated RECs is recognized when the related energy is generated and simultaneously delivered even in cases where there is a certification lag as it has been deemed to be perfunctory. Contract Amortization Assets and liabilities recognized from power sales agreements assumed through acquisitions related to the sale of electric capacity and energy in future periods for which the fair value has been determined to be significantly less (more) than market are amortized to revenue over the term of each underlying contract based on actual generation and/or contracted volumes or on a straight-line basis, where applicable.
Recently Adopted Accounting Policies	Recently Adopted Accounting Standards In March 2020, the FASB issued ASU No. 2020-4, Facilitation of the Effects of Reference Rate Reform on Financial Reporting. The amendments provide for optional expedients and exceptions for applying GAAP to contracts, hedging relationships and other transactions affected by reference rate reform if certain criteria is met. These amendments apply only to contracts that reference LIBOR or another reference rate expected to be discontinued because of reference rate reform. The guidance is effective for all entities as of March 12, 2020 through December 31, 2022. The Company intends to apply the amendments to all its eligible contract modifications where applicable during the reference rate reform period. In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes. The amendments in this ASU simplify the accounting for income taxes by removing certain exceptions to the general principles in Topic 740, Income Taxes. The amendments also improve consistent application of and simplify GAAP for other areas of Topic 740 by clarifying and amending existing guidance. The Company adopted the guidance as of January 1, 2021, with no material impact to the financial statements.

Nature of Business (Tables)

Nature of Business (Tables)	6 Months Ended
Nature of Business (Tables)	Jun. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Company Structure	The following table represents the structure of the Company as of June 30, 2021:

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	6 Months Ended
Summary of Significant Accounting Policies (Tables)	Jun. 30, 2021
Accounting Policies [Abstract]
Schedule of Cash and Cash Equivalents	The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the consolidated balance sheets that sum to the total of the same such amounts shown in the statements of cash flows: June 30, 2021 December 31, 2020 (In millions) Cash and cash equivalents $ 138 $ 268 Restricted cash 332 197 Cash, cash equivalents and restricted cash shown in the statement of cash flows $ 470 $ 465
Schedule of Restricted Cash	The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the consolidated balance sheets that sum to the total of the same such amounts shown in the statements of cash flows: June 30, 2021 December 31, 2020 (In millions) Cash and cash equivalents $ 138 $ 268 Restricted cash 332 197 Cash, cash equivalents and restricted cash shown in the statement of cash flows $ 470 $ 465
Schedule of Accumulated Amortization and Depreciation	The following table presents the accumulated depreciation included in the property, plant and equipment, net, and accumulated amortization included in intangible assets, net, respectively, as of June 30, 2021 and December 31, 2020: June 30, 2021 December 31, 2020 (In millions) Property, Plant and Equipment Accumulated Depreciation $ 2,573 $ 2,323 Intangible Assets Accumulated Amortization 556 487
Dividends Declared	The following table lists the dividends paid on the Company's Class A common stock and Class C common stock during the six months ended June 30, 2021: Second Quarter 2021 First Quarter 2021 Dividends per Class A share $ 0.329 $ 0.324 Dividends per Class C share $ 0.329 $ 0.324
Distributions Made to Limited Liability Company (LLC) Member, by Distribution	The following table lists distributions paid to CEG during the six months ended June 30, 2021 on Clearway Energy LLC's Class B and D units: Second Quarter 2021 First Quarter 2021 Distributions per Class B Unit $ 0.329 $ 0.324 Distributions per Class D Unit $ 0.329 $ 0.324
Disaggregation of Revenue	The following tables represent the Company’s disaggregation of revenue from contracts with customers along with the reportable segment for each category for the three and six months ended June 30, 2021 and 2020, respectively: Three months ended June 30, 2021 (In millions) Conventional Generation Renewables Thermal Total Energy revenue (a) $ 2 $ 261 $ 29 $ 292 Capacity revenue (a) 113 — 15 128 Contract amortization (6) (30) (1) (37) Other revenue — 22 6 28 Mark-to-market for economic hedges — (31) — (31) Total operating revenue 109 222 49 380 Less: Mark-to-market for economic hedges — 31 — 31 Less: Lease revenue (115) (228) — (343) Less: Contract amortization 6 30 1 37 Total revenue from contracts with customers $ — $ 55 $ 50 $ 105 (a) The following amounts of energy and capacity revenue relate to leases and are accounted for under ASC 842: (In millions) Conventional Generation Renewables Thermal Total Energy revenue $ 2 $ 228 $ — $ 230 Capacity revenue 113 — — 113 Total $ 115 $ 228 $ — $ 343 Six months ended June 30, 2021 (In millions) Conventional Generation Renewables Thermal Total Energy revenue (a) $ 3 $ 387 $ 58 $ 448 Capacity revenue (a) 220 — 28 248 Contract amortization (12) (55) (2) (69) Other revenue — 31 14 45 Mark-to-market for economic hedges — (55) — (55) Total operating revenue 211 308 98 617 Less: Mark-to-market for economic hedges — 55 — 55 Less: Lease revenue (223) (373) (1) (597) Less: Contract amortization 12 55 2 69 Total revenue from contracts with customers $ — $ 45 $ 99 $ 144 (a) The following amounts of energy and capacity revenue relate to leases and are accounted for under ASC 842: (In millions) Conventional Generation Renewables Thermal Total Energy revenue $ 3 $ 373 $ 1 $ 377 Capacity revenue 220 — — 220 Total $ 223 $ 373 $ 1 $ 597 Three months ended June 30, 2020 (In millions) Conventional Generation Renewables Thermal Total Energy revenue (a) $ 1 $ 195 $ 22 $ 218 Capacity revenue (a) 112 — 12 124 Contract amortization (6) (16) — (22) Other revenue — 4 8 12 Mark-to-market for economic hedges — (3) — (3) Total operating revenue 107 180 42 329 Less: Mark-to-market for economic hedges — 3 — 3 Less: Lease revenue (113) (181) — (294) Less: Contract amortization 6 16 — 22 Total revenue from contracts with customers $ — $ 18 $ 42 $ 60 (a) The following amounts of energy and capacity revenue relate to leases and are accounted for under ASC 842: (In millions) Conventional Generation Renewables Thermal Total Energy revenue $ 1 $ 181 $ — $ 182 Capacity revenue 112 — — 112 Total $ 113 $ 181 $ — $ 294 Six months ended June 30, 2020 (In millions) Conventional Generation Renewables Thermal Total Energy revenue (a) $ 3 $ 320 $ 50 $ 373 Capacity revenue (a) 219 — 26 245 Contract amortization (12) (31) (1) (44) Other revenue — 6 15 21 Mark-to-market for economic hedges — (8) — (8) Total operating revenue 210 287 90 587 Less: Mark-to-market for economic hedges — 8 — 8 Less: Lease revenue (222) (296) (1) (519) Less: Contract amortization 12 31 1 44 Total revenue from contracts with customers $ — $ 30 $ 90 $ 120 (a) The following amounts of energy and capacity revenue relate to leases and are accounted for under ASC 842: (In millions) Conventional Generation Renewables Thermal Total Energy revenue $ 3 $ 296 $ 1 $ 300 Capacity revenue 219 — — 219 Total $ 222 $ 296 $ 1 $ 519
Contract with Customer, Asset and Liability	The following table reflects the contract assets and liabilities included on the Company’s balance sheet as of June 30, 2021 and December 31, 2020: June 30, 2021 December 31, 2020 (In millions) Accounts receivable, net - Contracts with customers $ 66 $ 57 Accounts receivable, net - Leases 137 86 Total accounts receivable, net $ 203 $ 143

Acquisition and Dispositions (T

Acquisition and Dispositions (Tables)	6 Months Ended
Acquisition and Dispositions (Tables)	Jun. 30, 2021
Business Combination and Asset Acquisition [Abstract]
Schedule of Asset Acquisition	The following is a summary of assets and liabilities transferred in connection with the acquisition as of January 12, 2021: (In millions) Rattlesnake Current Assets $ 8 Property, plant and equipment 200 Right-of-use asset 12 Total assets acquired 220 Debt (a) 176 Long-term lease liabilities 12 Other current and non-current liabilities 18 Total liabilities assumed 206 Net assets acquired $ 14 (a) Repaid at acquisition date utilizing $107 million contributed by tax equity investor and $103 million contributed by CEG, both recorded as contributions in noncontrolling interest. Of the $210 million contributed, $176 million was utilized to pay down the acquired debt, $29 million was utilized to fund project reserve accounts and $5 million was utilized to pay associated fees. The following is a summary of assets and liabilities acquired in connection with the acquisition as of February 3, 2021: (In millions) Agua Caliente Restricted cash $ 91 Property, plant and equipment 154 Intangible asset for power purchase agreement 1,022 Other currents assets 9 Total assets acquired 1,276 Accounts payable and other current liabilities 5 Debt 716 Total liabilities assumed 721 Noncontrolling interest 273 Equity method investment removed (80) Net assets acquired $ 202 (In millions) Mt. Storm Current Assets $ 3 Property, plant and equipment 108 Intangible asset 2 Total assets acquired 113 Accounts payable and other liabilities 4 Derivative instruments 9 Total liabilities assumed 13 Net assets acquired $ 100

Investments Accounted for by _2

Investments Accounted for by the Equity Method and Variable Interest Entities (Tables)	6 Months Ended
	Jun. 30, 2021
Equity Method Investments and Joint Ventures [Abstract]
Schedule of Variable Interest Entities	Summarized financial information for the Company's consolidated VIEs consisted of the following as of June 30, 2021: (In millions) Alta TE Holdco Buckthorn Renewables, LLC DGPV Funds (a) Kawailoa Partnership Langford TE Partnership LLC Lighthouse Renewable Holdco LLC Other current and non-current assets $ 59 $ 4 $ 96 $ 42 $ 15 $ 41 Property, plant and equipment 344 206 611 138 135 437 Intangible assets 218 — 16 — 2 — Total assets 621 210 723 180 152 478 Current and non-current liabilities 38 10 77 106 17 126 Total liabilities 38 10 77 106 17 126 Noncontrolling interest 26 51 4 51 74 313 Net assets less noncontrolling interests $ 557 $ 149 $ 642 $ 23 $ 61 $ 39 (a) DGPV Funds is comprised of DGPV Fund 2 LLC, Clearway & EFS Distributed Solar LLC, DGPV Fund 4 LLC, Golden Puma Fund LLC, Renew Solar CS4 Fund LLC and Chestnut Fund LLC. (In millions) Oahu Pinnacle Repowering Partnership LLC Rattlesnake TE Holdco LLC Rosie TargetCo LLC Wildorado TE Holdco Other (a) Other current and non-current assets $ 50 $ 12 $ 31 $ 27 $ 21 $ 16 Property, plant and equipment 175 100 196 255 232 178 Intangible assets — 19 — — — 1 Total assets 225 131 227 282 253 195 Current and non-current liabilities 117 102 21 101 18 44 Total liabilities 117 102 21 101 18 44 Noncontrolling interest 35 27 98 147 127 99 Net assets less noncontrolling interests $ 73 $ 2 $ 108 $ 34 $ 108 $ 52 (a) Other is comprised of Crosswind Transmission, LLC, Hardin Hilltop Wind LLC, Elbow Creek TE Holdco and Spring Canyon TE Holdco projects.
Schedule of Maximum Loss Exposure in Equity Method Investments	The Company's maximum exposure to loss as of June 30, 2021 is limited to its equity investment in the unconsolidated entities, as further summarized in the table below: Name Economic Interest Investment Balance (In millions) Avenal 50% $ (3) Desert Sunlight 25% 244 Elkhorn Ridge 67% 34 GenConn (a) 50% 88 San Juan Mesa 75% 29 Utah Solar Portfolio (b) 50% 247 $ 639 ( a ) GenConn is a variable interest entity. (b) Economic interest based on cash to be distributed. Four Brothers Solar, LLC, Granite Mountain Holdings, LLC and Iron Springs Holdings, LLC are tax equity structures and VIEs.

Fair Value of Financial Instr_2

Fair Value of Financial Instruments (Tables)	6 Months Ended
Fair Value of Financial Instruments (Tables)	Jun. 30, 2021
Fair Value Disclosures [Abstract]
Estimated Carrying Values and Fair Values	The estimated carrying amounts and fair values of the Company’s recorded financial instruments not carried at fair market value are as follows: As of June 30, 2021 As of December 31, 2020 Carrying Amount Fair Value Carrying Amount Fair Value (In millions) Long-term debt, including current portion (a) $ 8,030 $ 8,006 $ 7,048 $ 7,020 (a) Excludes net debt issuance costs, which are recorded as a reduction to long-term debt on the Company's consolidated balance sheets.
Fair Value Option, Disclosures	The following table presents the level within the fair value hierarchy for long-term debt, including current portion as of June 30, 2021 and December 31, 2020: As of June 30, 2021 As of December 31, 2020 Level 2 Level 3 Level 2 Level 3 (In millions) Long-term debt, including current portion $ 2,166 $ 5,840 $ 1,905 $ 5,115
Schedule of Fair Value, Assets and Liabilities	The following table presents assets and liabilities measured and recorded at fair value on the Company's consolidated balance sheets on a recurring basis and their level within the fair value hierarchy: As of June 30, 2021 As of December 31, 2020 Fair Value (a) Fair Value (a) (In millions) Level 2 Level 3 Level 2 Level 3 Derivative assets: Interest rate contracts $ 4 $ — $ 1 $ — Other financial instruments (b) — 24 — 29 Total assets $ 4 $ 24 $ 1 $ 29 Derivative liabilities: Commodity contracts $ — $ 103 $ — $ 44 Interest rate contracts 86 — 129 — Total liabilities $ 86 $ 103 $ 129 $ 44 (a) There were no derivative assets classified as Level 1 or Level 3 and no liabilities classified as Level 1 as of June 30, 2021 and December 31, 2020. (b) SREC contract acquired on November 2, 2020. The following table reconciles the beginning and ending balances for instruments that are recognized at fair value in the condensed consolidated financial statements using significant unobservable inputs: Three months ended June 30, Six months ended June 30, 2021 2020 2021 2020 (In millions) Fair Value Measurement Using Significant Unobservable Inputs (Level 3) Fair Value Measurement Using Significant Unobservable Inputs (Level 3) Beginning balance $ (39) $ (14) $ (15) $ (9) Total losses for the period included in earnings (33) (3) (57) (8) Purchases (9) — (9) — Settlements 2 — 2 — Ending balance $ (79) $ (17) $ (79) $ (17) Change in unrealized losses included in earnings for derivatives and other financial instruments held as of June 30, 2021 $ (33) $ (57)
Fair Value Measurement Inputs and Valuation Techniques	The following table quantifies the significant unobservable inputs used in developing the fair value of the Company's Level 3 positions as of June 30, 2021: June 30, 2021 Fair Value Input/Range Assets Liabilities Valuation Technique Significant Unobservable Input Low High Weighted Average (In millions) Power Contracts $ — $ (103) Discounted Cash Flow Forward Market Price (per MWh) 12.56 58.94 25.95 Other Financial Instruments $ 24 $ — Discounted Cash Flow Forecast annual generation levels of certain DG solar facilities 80,872 MWh 129,913 MWh 124,783 MWh The following table provides sensitivity of fair value measurements to increases/(decreases) in significant unobservable inputs as of June 30, 2021: Significant Observable Input Position Change In Input Impact on Fair Value Measurement Forward Market Price Power Buy Increase/(Decrease) Higher/(Lower) Forward Market Price Power Sell Increase/(Decrease) Lower/(Higher) Forecast Generation Levels Sell Increase/(Decrease) Higher/(Lower)

Derivative Instruments and He_2

Derivative Instruments and Hedging Activities (Tables)	6 Months Ended
Derivative Instruments and Hedging Activities (Tables)	Jun. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Net notional volume buy/(sell) of NRG Yield's open derivative transactions broken out by commodity	The following table summarizes the net notional volume buy/(sell) of the Company's open derivative transactions broken out by commodity as of June 30, 2021 and December 31, 2020: Total Volume June 30, 2021 December 31, 2020 Commodity Units (In millions) Natural Gas MMBtu 1 1 Power MWh (13) (8) Interest Dollars $ 1,486 $ 1,600
Fair value within the derivative instrument valuation on the balance sheets	The following table summarizes the fair value within the derivative instrument valuation on the balance sheet: Fair Value Derivative Assets Derivative Liabilities June 30, 2021 December 31, 2020 June 30, 2021 December 31, 2020 (In millions) Derivatives Designated as Cash Flow Hedges: Interest rate contracts current $ — $ — $ 7 $ 8 Interest rate contracts long-term — — 7 15 Total Derivatives Designated as Cash Flow Hedges $ — $ — $ 14 $ 23 Derivatives Not Designated as Cash Flow Hedges: Interest rate contracts current — — 23 25 Interest rate contracts long-term 4 1 49 81 Commodity contracts current — — 14 5 Commodity contracts long-term — — 89 39 Total Derivatives Not Designated as Cash Flow Hedges 4 1 175 150 Total Derivatives $ 4 $ 1 $ 189 $ 173
Offsetting of derivatives by counterparty master agreement level and collateral received or paid	The following tables summarize the offsetting of derivatives by counterparty master agreement level as of June 30, 2021 and December 31, 2020: As of June 30, 2021 Gross Amounts of Recognized Assets/Liabilities Derivative Instruments Net Amount Commodity contracts (In millions) Derivative liabilities $ (103) $ — $ (103) Total commodity contracts (103) — (103) Interest rate contracts Derivative assets $ 4 $ (4) $ — Derivative liabilities (86) 4 (82) Total interest rate contracts (82) — (82) Total derivative instruments $ (185) $ — $ (185) As of December 31, 2020 Gross Amounts of Recognized Assets/Liabilities Derivative Instruments Net Amount Commodity contracts (In millions) Derivative liabilities $ (44) $ — $ (44) Total commodity contracts (44) — (44) Interest rate contracts: Derivative assets $ 1 $ — $ 1 Derivative liabilities (129) — (129) Total interest rate contracts (128) — (128) Total derivative instruments $ (172) $ — $ (172)
Effects of NRG Yield's accumulated OCI balance attributable to interest rate swaps designated as cash flow hedge derivatives, net of tax	The following table summarizes the effects on the Company’s accumulated OCL balance attributable to interest rate swaps designated as cash flow hedge derivatives, net of tax: Three months ended June 30, Six months ended June 30, 2021 2020 2021 2020 (In millions) Accumulated OCL beginning balance $ (19) $ (43) $ (30) $ (31) Reclassified from accumulated OCL to income due to realization of previously deferred amounts 2 1 4 3 Mark-to-market of cash flow hedge accounting contracts (2) 3 7 (11) Accumulated OCL ending balance, net of income tax benefit of $4, $7, $4 and $7, respectively (19) (39) (19) (39) Accumulated OCL attributable to noncontrolling interests (10) (20) (10) (20) Accumulated OCL attributable to Clearway Energy, Inc. $ (9) $ (19) $ (9) $ (19) Losses expected to be realized from OCL during the next 12 months, net of income tax benefit of $3 $ (9) $ (9)
Derivative gains and losses	Gains and losses related to the Company's derivatives are recorded in the consolidated statement of operations as follows: Three months ended June 30, Six months ended June 30, 2021 2020 2021 2020 (In millions) Interest Rate Contracts (Interest expense) $ (11) $ (13) $ 36 $ (92) Commodity Contracts (Mark-to-market for economic hedging activities) (a) (28) (3) (50) (8) (a) Relates to long-term power hedges at Elbow Creek Wind Project LLC, or Elbow Creek, Mesquite Star Special LLC, or Mesquite Star, and NedPower Mount Storm LLC, or Mt. Storm.

Long-term Debt (Tables)

Long-term Debt (Tables)	6 Months Ended
Long-term Debt (Tables)	Jun. 30, 2021
Debt Disclosure [Abstract]
Schedule of long-term debt	Long-term debt consisted of the following: (In millions, except rates) June 30, 2021 December 31, 2020 June 30, 2021 interest rate % (a) Letters of Credit Outstanding at June 30, 2021 2025 Senior Notes $ — $ 600 5.750 2026 Senior Notes 350 350 5.000 2028 Senior Notes 850 850 4.750 2031 Senior Notes 925 — 3.750 Clearway Energy LLC and Clearway Energy Operating LLC Revolving Credit Facility, due 2023 (b) 67 — L+1.750 88 Project-level debt: Agua Caliente Solar LLC, due 2037 712 — 2.395 - 3.633 44 Alta Wind Asset Management LLC, due 2031 14 14 L+2.625 26 Alta Wind I-V lease financing arrangements, due 2034 and 2035 772 800 5.696 - 7.015 — Alta Wind Realty Investments LLC, due 2031 25 25 7.000 — Borrego, due 2024 and 2038 57 57 Various 4 Buckthorn Solar, due 2025 125 126 L+1.750 23 Carlsbad Energy Holdings LLC, due 2027 156 156 L+1.625 82 Carlsbad Energy Holdings LLC, due 2038 407 407 4.120 — Carlsbad Holdco, due 2038 210 210 4.210 10 CVSR Holdco Notes, due 2037 169 176 4.680 13 CVSR, due 2037 662 675 2.339 - 3.775 — DG-CS Master Borrower LLC, due 2040 462 467 3.510 30 Duquesne, due 2059 95 95 4.620 — El Segundo Energy Center, due 2023 213 250 L+1.875 - L+2.500 138 Energy Center Minneapolis Series D, E, F, G, H Notes, due 2025-2037 327 327 Various — Kawailoa Solar Portfolio LLC, due 2026 80 81 L+1.375 15 Laredo Ridge, due 2028 75 78 L+2.125 9 Marsh Landing, due 2023 129 146 L+2.375 99 NIMH Solar, due 2024 185 191 L+2.00 16 Oahu Solar Holdings LLC, due 2026 88 89 L+1.375 11 Pinnacle Repowering Partnership Holdco LLC, due 2021 90 — L+1.00 2 Rosie Class B LLC, due 2027 80 80 L+1.75 21 Tapestry Wind LLC, due 2031 88 143 L+1.375 11 Utah Solar Holdings, due 2036 284 290 3.590 16 Walnut Creek, due 2023 110 126 L+1.75 103 WCEP Holdings, LLC, due 2023 32 35 L+3.00 — Other 187 199 Various 38 Subtotal project-level debt: 5,834 5,243 Total debt 8,026 7,043 Less current maturities (518) (384) Less net debt issuance costs (78) (79) Add premiums (c) 4 5 Total long-term debt $ 7,434 $ 6,585 (a) As of June 30, 2021, L+ equals 3 month LIBOR plus x%, except Clearway Energy Operating LLC Revolving Credit Facility, due 2023, Marsh Landing, due 2023, Pinnacle Repowering Partnership HoldCo LLC, due 2021, and Walnut Creek, due 2023, where L+ equals 1 month LIBOR plus x%. (b) Applicable rate is determined by the borrower leverage ratio, as defined in the credit agreement. (c) Premiums relate to the 2028 Senior Notes.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
Earnings Per Share (Tables)	Jun. 30, 2021
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic	The reconciliation of Clearway Energy, Inc.'s basic and diluted earnings per share is shown in the following tables: Three months ended June 30, 2021 2020 (In millions, except per share data) (a) Common Class A Common Class C Common Class A Common Class C Basic and diluted income per share attributable to Clearway Energy, Inc. common stockholders Net income attributable to Clearway Energy, Inc. $ 10 $ 25 $ 14 $ 33 Weighted average number of common shares outstanding — basic and diluted 35 82 35 80 Earnings per weighted average common share — basic and diluted $ 0.30 $ 0.30 $ 0.41 $ 0.41 (a) Basic and diluted earnings per share might not recalculate due to presenting values in millions rather than whole dollars. Six months ended June 30, 2021 2020 (In millions, except per share data) (a) Common Class A Common Class C Common Class A Common Class C Basic and diluted income per share attributable to Clearway Energy, Inc. common stockholders Net income attributable to Clearway Energy, Inc. $ 11 $ 27 $ 6 $ 13 Weighted average number of common shares outstanding — basic and diluted 35 82 35 79 Earnings per weighted average common share — basic and diluted $ 0.32 $ 0.32 $ 0.16 $ 0.16
Schedule of Earnings Per Share, Diluted	The reconciliation of Clearway Energy, Inc.'s basic and diluted earnings per share is shown in the following tables: Three months ended June 30, 2021 2020 (In millions, except per share data) (a) Common Class A Common Class C Common Class A Common Class C Basic and diluted income per share attributable to Clearway Energy, Inc. common stockholders Net income attributable to Clearway Energy, Inc. $ 10 $ 25 $ 14 $ 33 Weighted average number of common shares outstanding — basic and diluted 35 82 35 80 Earnings per weighted average common share — basic and diluted $ 0.30 $ 0.30 $ 0.41 $ 0.41 (a) Basic and diluted earnings per share might not recalculate due to presenting values in millions rather than whole dollars. Six months ended June 30, 2021 2020 (In millions, except per share data) (a) Common Class A Common Class C Common Class A Common Class C Basic and diluted income per share attributable to Clearway Energy, Inc. common stockholders Net income attributable to Clearway Energy, Inc. $ 11 $ 27 $ 6 $ 13 Weighted average number of common shares outstanding — basic and diluted 35 82 35 79 Earnings per weighted average common share — basic and diluted $ 0.32 $ 0.32 $ 0.16 $ 0.16

Segment Reporting (Tables)

Segment Reporting (Tables)	6 Months Ended
Segment Reporting (Tables)	Jun. 30, 2021
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	Three months ended June 30, 2021 (In millions) Conventional Generation Renewables Thermal Corporate (a) Total Operating revenues $ 109 $ 222 $ 49 $ — $ 380 Cost of operations, exclusive of depreciation, amortization and accretion shown separately below 23 54 31 (1) 107 Depreciation, amortization and accretion 31 89 8 — 128 General and administrative — 1 — 9 10 Transaction and integration costs — — — 1 1 Development costs — — 1 — 1 Operating income (loss) 55 78 9 (9) 133 Equity in earnings of unconsolidated affiliates 2 6 — — 8 Other income, net (1) 1 1 — 1 Interest expense (16) (58) (4) (25) (103) Income (loss) before income taxes 40 27 6 (34) 39 Income tax expense — — — 7 7 Net Income (Loss) $ 40 $ 27 $ 6 $ (41) $ 32 Total Assets $ 2,500 $ 8,617 $ 621 $ 143 $ 11,881 (a) Includes eliminations Three months ended June 30, 2020 (In millions) Conventional Generation Renewables Thermal Corporate Total Operating revenues $ 107 $ 180 $ 42 $ — $ 329 Cost of operations, exclusive of depreciation, amortization and accretion shown separately below 22 39 26 — 87 Depreciation, amortization and accretion 33 59 7 — 99 General and administrative — 1 2 9 12 Development costs — — 1 — 1 Operating income (loss) 52 81 6 (9) 130 Equity in earnings of unconsolidated affiliates 1 15 — — 16 Gain on sale of unconsolidated affiliate — — — 49 49 Interest expense (22) (42) (5) (24) (93) Income before income taxes 31 54 1 16 102 Income tax expense — — — 26 26 Net Income (Loss) $ 31 $ 54 $ 1 $ (10) $ 76 Six months ended June 30, 2021 (In millions) Conventional Generation Renewables Thermal Corporate (a) Total Operating revenues $ 211 $ 308 $ 98 $ — $ 617 Cost of operations, exclusive of depreciation, amortization and accretion shown separately below 50 106 62 (1) 217 Depreciation, amortization and accretion 65 176 15 — 256 General and administrative — 1 1 18 20 Transaction and integration costs — — — 3 3 Development costs — — 2 — 2 Operating income (loss) 96 25 18 (20) 119 Equity in earnings of unconsolidated affiliates 4 8 — — 12 Other income, net — 1 1 — 2 Loss on debt extinguishment — (1) — (41) (42) Interest expense (27) (62) (9) (50) (148) Income (loss) before income taxes 73 (29) 10 (111) (57) Income tax benefit — — — (13) (13) Net Income (Loss) $ 73 $ (29) $ 10 $ (98) $ (44) (a) Includes eliminations Six months ended June 30, 2020 (In millions) Conventional Generation Renewables Thermal Corporate Total Operating revenues $ 210 $ 287 $ 90 $ — $ 587 Cost of operations, exclusive of depreciation, amortization and accretion shown separately below 46 75 59 — 180 Depreciation, amortization and accretion 66 121 14 — 201 General and administrative — 1 3 17 21 Transaction and integration costs — — — 1 1 Development costs — — 2 — 2 Operating income (loss) 98 90 12 (18) 182 Equity in earnings of unconsolidated affiliates 3 — — — 3 Gain on sale of unconsolidated affiliate — — — 49 49 Other income, net — 1 1 — 2 Loss on debt extinguishment — — — (3) (3) Interest expense (52) (151) (10) (47) (260) Income (loss) before income taxes 49 (60) 3 (19) (27) Income tax expense — — — 4 4 Net Income (Loss) $ 49 $ (60) $ 3 $ (23) $ (31)

Income Taxes (Tables)

Income Taxes (Tables)	6 Months Ended
Income Taxes (Tables)	Jun. 30, 2021
Income Tax Disclosure [Abstract]
Reconciliation of the U.S. federal statutory rate to the Company's effective rate	The income tax provision consisted of the following: Three months ended June 30, Six months ended June 30, 2021 2020 2021 2020 (In millions, except percentages) Income (loss) before income tax $ 39 $ 102 $ (57) $ (27) Income tax expense 7 26 (13) 4 Effective income tax rate 17.9 % 25.5 % 22.8 % (14.8) %

Nature of Business (Details)

Nature of Business (Details)	6 Months Ended
Nature of Business (Details)	Jun. 30, 2021MW
Nature of Business [Line Items]
Power generation capacity, megawatts (over)	8,000
Conventional Generation, Utility-Scale Solar, Distributed Solar, and Wind
Nature of Business [Line Items]
Power generation capacity, megawatts (over)	4,700
Generational Facilities and District Energy Systems
Nature of Business [Line Items]
Power generation capacity, megawatts (over)	2,500
Clearway Energy LLC \| Clearway Energy, Inc.
Nature of Business [Line Items]
Ownership interest (as a percentage)	57.65%
CEG \| Clearway Energy LLC
Nature of Business [Line Items]
Ownership interest (as a percentage)	42.35%
CEG \| Clearway Energy, Inc.
Nature of Business [Line Items]
Voting Interest (as a percentage)	54.93%
Public Shareholders \| Clearway Energy, Inc.
Nature of Business [Line Items]
Voting Interest (as a percentage)	45.07%

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, held at project subsidiaries	$ 125	$ 149
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	138	268
Restricted cash	332	197
Cash, cash equivalents and restricted cash shown in the statement of cash flows	470	$ 465	$ 416	$ 417
State of Hawaii \| Prepayments and other current assets
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Refundable tax credit receivable	49
Long Term Debt Current
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Restricted cash	38
Debt Service Obligations
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Restricted cash	130
Cash Distribution
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Restricted cash	33
Operating Funds
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Restricted cash	$ 131

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Accumulated Depreciation, Accumulated Amortization (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Property, Plant and Equipment Accumulated Depreciation	$ 2,573	$ 2,323
Intangible Assets Accumulated Amortization	$ 556	$ 487

Summary of Significant Accoun_6

Summary of Significant Accounting Policies - Dividends Paid (Details) - $ / shares	Jul. 23, 2021	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Common Class A
Class of Stock [Line Items]
Common stock, dividends, per share, cash paid (in dollars per share)		$ 0.329	$ 0.324	$ 0.210	$ 0.658	$ 0.420
Common Class A \| Subsequent Event
Class of Stock [Line Items]
Common stock, dividends, per share, declared (in dollars per share)	$ 0.3345
Common Class C
Class of Stock [Line Items]
Common stock, dividends, per share, cash paid (in dollars per share)		$ 0.329	$ 0.324	$ 0.210	$ 0.658	$ 0.420
Common Class C \| Subsequent Event
Class of Stock [Line Items]
Common stock, dividends, per share, declared (in dollars per share)	$ 0.3345

Summary of Significant Accoun_7

Summary of Significant Accounting Policies - Noncontrolling Interests (Details) - $ / shares	Jul. 23, 2021	Jun. 30, 2021	Mar. 31, 2021
Common Class B \| Subsequent Event
Summary of Significant Accounting Policies [Line Items]
Distribution made to limited liability (LLC) member, distributions declared, per unit (in dollars per share)	$ 0.3345
Common Class B \| Clearway Energy LLC
Summary of Significant Accounting Policies [Line Items]
Distribution made to limited liability company (LLC) member, distributions paid, per unit (in dollars per share)		$ 0.329	$ 0.324
Common Class D \| Subsequent Event
Summary of Significant Accounting Policies [Line Items]
Distribution made to limited liability (LLC) member, distributions declared, per unit (in dollars per share)	$ 0.3345
Common Class D \| Clearway Energy LLC
Summary of Significant Accounting Policies [Line Items]
Distribution made to limited liability company (LLC) member, distributions paid, per unit (in dollars per share)		$ 0.329	$ 0.324

Summary of Significant Accoun_8

Summary of Significant Accounting Policies - Disaggregated Revenues (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Operating revenue	$ 380	$ 329	$ 617	$ 587
Total operating revenues	380	329	617	587
Lease income				(519)
Conventional Generation
Disaggregation of Revenue [Line Items]
Lease income				(222)
Renewables
Disaggregation of Revenue [Line Items]
Lease income				(296)
Thermal
Disaggregation of Revenue [Line Items]
Lease income				(1)
Energy revenue
Disaggregation of Revenue [Line Items]
Lease income				(300)
Capacity revenue
Disaggregation of Revenue [Line Items]
Lease income				(219)
Operating Segments
Disaggregation of Revenue [Line Items]
Operating revenue	380	329	617	587
Contract amortization	(37)	(22)	(69)	(44)
Mark-to-market for economic hedges	(31)	(3)	(55)	(8)
Total operating revenues	380	329	617	587
Less: Mark-to-market for economic hedges	31	3	55	8
Lease income	(343)	(294)	(597)	(519)
Less: Contract amortization	37	22	69	44
Total revenue from contracts with customers	105	60	144	120
Operating Segments \| Conventional Generation
Disaggregation of Revenue [Line Items]
Operating revenue	109	107	211	210
Contract amortization	(6)	(6)	(12)	(12)
Mark-to-market for economic hedges	0	0	0	0
Total operating revenues	109	107	211	210
Less: Mark-to-market for economic hedges	0	0	0	0
Lease income	(115)	(113)	(223)	(222)
Less: Contract amortization	6	6	12	12
Total revenue from contracts with customers	0	0	0	0
Operating Segments \| Renewables
Disaggregation of Revenue [Line Items]
Operating revenue	222	180	308	287
Contract amortization	(30)	(16)	(55)	(31)
Mark-to-market for economic hedges	(31)	(3)	(55)	(8)
Total operating revenues	222	180	308	287
Less: Mark-to-market for economic hedges	31	3	55	8
Lease income	(228)	(181)	(373)	(296)
Less: Contract amortization	30	16	55	31
Total revenue from contracts with customers	55	18	45	30
Operating Segments \| Thermal
Disaggregation of Revenue [Line Items]
Operating revenue	49	42	98	90
Contract amortization	(1)	0	(2)	(1)
Mark-to-market for economic hedges	0	0	0	0
Total operating revenues	49	42	98	90
Less: Mark-to-market for economic hedges	0	0	0	0
Lease income	0	0	(1)	(1)
Less: Contract amortization	1	0	2	1
Total revenue from contracts with customers	50	42	99	90
Operating Segments \| Energy revenue
Disaggregation of Revenue [Line Items]
Operating revenue	292	218	448	373
Total operating revenues	292	218	448	373
Lease income	(230)	(182)	(377)	(300)
Operating Segments \| Energy revenue \| Conventional Generation
Disaggregation of Revenue [Line Items]
Operating revenue	2	1	3	3
Total operating revenues	2	1	3	3
Lease income	(2)	(1)	(3)	(3)
Operating Segments \| Energy revenue \| Renewables
Disaggregation of Revenue [Line Items]
Operating revenue	261	195	387	320
Total operating revenues	261	195	387	320
Lease income	(228)	(181)	(373)	(296)
Operating Segments \| Energy revenue \| Thermal
Disaggregation of Revenue [Line Items]
Operating revenue	29	22	58	50
Total operating revenues	29	22	58	50
Lease income	0	0	(1)	(1)
Operating Segments \| Capacity revenue
Disaggregation of Revenue [Line Items]
Operating revenue	128	124	248	245
Total operating revenues	128	124	248	245
Lease income	(113)	(112)	(220)	(219)
Operating Segments \| Capacity revenue \| Conventional Generation
Disaggregation of Revenue [Line Items]
Operating revenue	113	112	220	219
Total operating revenues	113	112	220	219
Lease income	(113)	(112)	(220)	(219)
Operating Segments \| Capacity revenue \| Renewables
Disaggregation of Revenue [Line Items]
Operating revenue	0	0	0	0
Total operating revenues	0	0	0	0
Lease income	0	0	0	0
Operating Segments \| Capacity revenue \| Thermal
Disaggregation of Revenue [Line Items]
Operating revenue	15	12	28	26
Total operating revenues	15	12	28	26
Lease income	0	0	0	0
Operating Segments \| Other revenue
Disaggregation of Revenue [Line Items]
Operating revenue	28	12	45	21
Total operating revenues	28	12	45	21
Operating Segments \| Other revenue \| Conventional Generation
Disaggregation of Revenue [Line Items]
Operating revenue	0	0	0	0
Total operating revenues	0	0	0	0
Operating Segments \| Other revenue \| Renewables
Disaggregation of Revenue [Line Items]
Operating revenue	22	4	31	6
Total operating revenues	22	4	31	6
Operating Segments \| Other revenue \| Thermal
Disaggregation of Revenue [Line Items]
Operating revenue	6	8	14	15
Total operating revenues	$ 6	$ 8	$ 14	$ 15

Summary of Significant Accoun_9

Summary of Significant Accounting Policies - Contract Balances (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable, net	$ 203	$ 143
Accounts receivable, net - Contracts with customers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable, net	66	57
Accounts receivable, net - Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable, net	$ 137	$ 86

Acquisition and Dispositions -

Acquisition and Dispositions - Narrative (Details) $ in Millions	Apr. 23, 2021USD ($)MW	Mar. 03, 2021USD ($)	Feb. 03, 2021USD ($)MW	Jan. 12, 2021USD ($)MW	May 14, 2020USD ($)	Mar. 03, 2020	Jun. 30, 2021USD ($)MW	Jun. 30, 2020USD ($)	Feb. 02, 2021
Schedule of Asset Acquisition [Line Items]
Payments for asset acquisition							$ 211	$ 0
Power generation capacity, megawatts \| MW							8,000
RPV Holdco 1 LLC
Schedule of Asset Acquisition [Line Items]
Proceeds from sale of interests					$ 75
Gain on sale of investment					$ 49
Energy Center Dover
Schedule of Asset Acquisition [Line Items]
Proceeds from sale of interests		$ 15
Sale of assets percentage ownership interest sold						100.00%
Rattlesnake TE Holdco LLC
Schedule of Asset Acquisition [Line Items]
Payments for asset acquisition				$ 132
Power purchase agreement period				20 years
Net assets acquired				$ 14
Agua Caliente
Schedule of Asset Acquisition [Line Items]
Payments for asset acquisition			$ 202
Power generation capacity, megawatts \| MW			290
Power purchase agreement period			25 years
Net assets acquired			$ 202
Asset acquisition, percentage equity interests acquired			35.00%
Power purchase agreement period (in years)			19 years
Asset acquisition, restricted cash acquired			$ 91
Payments for asset acquisition, net cash outflow			$ 111
Mt. Storm
Schedule of Asset Acquisition [Line Items]
Net assets acquired	$ 100
Asset acquisition, percentage equity interests acquired	100.00%
Acquisition consideration	$ 96
Working capital and purchase price adjustments	4
Payments to acquire productive assets	$ 100
Energy hedge with investment-grade counterparty (in years)	10 years
Wind Power Generation \| Rattlesnake TE Holdco LLC
Schedule of Asset Acquisition [Line Items]
Power generation capacity, megawatts \| MW				160
Deliverable power generation capacity, megawatts \| MW				144
Wind Power Generation \| Mt. Storm
Schedule of Asset Acquisition [Line Items]
Power generation capacity, megawatts \| MW	264
Clearway Energy, Inc. \| Agua Caliente
Schedule of Asset Acquisition [Line Items]
Noncontrolling interest, ownership percentage by parent									16.00%
Agua Caliente
Schedule of Asset Acquisition [Line Items]
Ownership interest			51.00%
Third Party Investor \| Agua Caliente
Schedule of Asset Acquisition [Line Items]
Ownership percentage by third party investor							49.00%

Acquisitions and Dispositions -

Acquisitions and Dispositions - Summary of Assets and Liabilities Transferred (Details) - USD ($) $ in Millions	Apr. 23, 2021	Feb. 03, 2021	Jan. 12, 2021	Jun. 30, 2021	Jun. 30, 2020
Schedule of Asset Acquisition [Line Items]
Net contributions from noncontrolling interests				$ 265	$ 154
Payments to fund project reserve accounts			$ 29
Payments for associated fees			5
Tax Equity Investors
Schedule of Asset Acquisition [Line Items]
Net contributions from noncontrolling interests			107
CEG
Schedule of Asset Acquisition [Line Items]
Net contributions from noncontrolling interests			103
Rattlesnake TE Holdco LLC
Schedule of Asset Acquisition [Line Items]
Current Assets			8
Property, plant and equipment			200
Right-of-use asset			12
Total assets acquired			220
Debt			176
Long-term lease liabilities			12
Other current and non-current liabilities			18
Total liabilities assumed			206
Net assets acquired			14
Net contributions from noncontrolling interests			210
Repayment of debt at asset acquisition			$ 176
Agua Caliente
Schedule of Asset Acquisition [Line Items]
Restricted cash		$ 91
Property, plant and equipment		154
Intangible asset for power purchase agreement		1,022
Other currents assets		9
Total assets acquired		1,276
Accounts payable and other current liabilities		5
Debt		716
Total liabilities assumed		721
Noncontrolling interest		273
Equity method investment removed		(80)
Net assets acquired		$ 202
Mt. Storm
Schedule of Asset Acquisition [Line Items]
Current Assets	$ 3
Property, plant and equipment	108
Intangible asset for power purchase agreement	2
Total assets acquired	113
Accounts payable and other current liabilities	4
Derivative instruments	9
Total liabilities assumed	13
Net assets acquired	$ 100

Investments Accounted for by _3

Investments Accounted for by the Equity Method and Variable Interest Entities - Consolidated Entities (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Other current and non-current assets	$ 3,577	$ 2,667
Property, plant and equipment	7,537	7,217
Intangible assets	2,188	1,231
Total Assets	11,881	10,592
Total Liabilities	8,878	$ 7,877
Alta TE Holdco
Schedule of Equity Method Investments [Line Items]
Other current and non-current assets	59
Property, plant and equipment	344
Intangible assets	218
Total Assets	621
Total Liabilities	38
Noncontrolling interest	26
Net assets less noncontrolling interests	557
Buckthorn Renewables, LLC
Schedule of Equity Method Investments [Line Items]
Other current and non-current assets	4
Property, plant and equipment	206
Intangible assets	0
Total Assets	210
Total Liabilities	10
Noncontrolling interest	51
Net assets less noncontrolling interests	149
DGPV Funds
Schedule of Equity Method Investments [Line Items]
Other current and non-current assets	96
Property, plant and equipment	611
Intangible assets	16
Total Assets	723
Total Liabilities	77
Noncontrolling interest	4
Net assets less noncontrolling interests	642
Kawailoa Partnership
Schedule of Equity Method Investments [Line Items]
Other current and non-current assets	42
Property, plant and equipment	138
Intangible assets	0
Total Assets	180
Total Liabilities	106
Noncontrolling interest	51
Net assets less noncontrolling interests	23
Langford TE Partnership LLC
Schedule of Equity Method Investments [Line Items]
Other current and non-current assets	15
Property, plant and equipment	135
Intangible assets	2
Total Assets	152
Total Liabilities	17
Noncontrolling interest	74
Net assets less noncontrolling interests	61
Lighthouse Renewable Holdco LLC
Schedule of Equity Method Investments [Line Items]
Other current and non-current assets	41
Property, plant and equipment	437
Intangible assets	0
Total Assets	478
Total Liabilities	126
Noncontrolling interest	313
Net assets less noncontrolling interests	39
Oahu Solar Partnership
Schedule of Equity Method Investments [Line Items]
Other current and non-current assets	50
Property, plant and equipment	175
Intangible assets	0
Total Assets	225
Total Liabilities	117
Noncontrolling interest	35
Net assets less noncontrolling interests	73
Pinnacle Repowering Partnership LLC
Schedule of Equity Method Investments [Line Items]
Other current and non-current assets	12
Property, plant and equipment	100
Intangible assets	19
Total Assets	131
Total Liabilities	102
Noncontrolling interest	27
Net assets less noncontrolling interests	2
Rattlesnake TE Holdco LLC
Schedule of Equity Method Investments [Line Items]
Other current and non-current assets	31
Property, plant and equipment	196
Intangible assets	0
Total Assets	227
Total Liabilities	21
Noncontrolling interest	98
Net assets less noncontrolling interests	108
Rosie TargetCo LLC
Schedule of Equity Method Investments [Line Items]
Other current and non-current assets	27
Property, plant and equipment	255
Intangible assets	0
Total Assets	282
Total Liabilities	101
Noncontrolling interest	147
Net assets less noncontrolling interests	34
Wildorado TE Holdco
Schedule of Equity Method Investments [Line Items]
Other current and non-current assets	21
Property, plant and equipment	232
Intangible assets	0
Total Assets	253
Total Liabilities	18
Noncontrolling interest	127
Net assets less noncontrolling interests	108
Other
Schedule of Equity Method Investments [Line Items]
Other current and non-current assets	16
Property, plant and equipment	178
Intangible assets	1
Total Assets	195
Total Liabilities	44
Noncontrolling interest	99
Net assets less noncontrolling interests	$ 52

Investments Accounted for by _4

Investments Accounted for by the Equity Method and Variable Interest Entities - Acquisitions (Details) $ in Millions	Mar. 10, 2021USD ($)	Jan. 12, 2021USD ($)	Jun. 30, 2021USD ($)	Mar. 31, 2021USD ($)	Jun. 30, 2020USD ($)	Jun. 30, 2021USD ($)	Jun. 30, 2020USD ($)	Feb. 26, 2021MW
Schedule of Equity Method Investments [Line Items]
Payments for asset acquisition						$ 211	$ 0
Contributions from CEG, non-cash					$ 8
Rattlesnake TE Holdco LLC
Schedule of Equity Method Investments [Line Items]
Payments for asset acquisition		$ 132
Noncontrolling Interest
Schedule of Equity Method Investments [Line Items]
Contributions from CEG, non-cash					$ 8
CEG
Schedule of Equity Method Investments [Line Items]
Contributions from CEG, non-cash			$ 3	$ 27
CEG \| Noncontrolling Interest
Schedule of Equity Method Investments [Line Items]
Contributions from CEG, non-cash			$ 3	$ 27
Rattlesnake Class B LLC Credit Facility
Schedule of Equity Method Investments [Line Items]
Repayments of debt		176
Rattlesnake TE Holdco LLC \| Capital Unit, Class A \| Third Party Investor
Schedule of Equity Method Investments [Line Items]
Acquired membership interests		$ 107
Pinnacle Repowering Partnership LLC
Schedule of Equity Method Investments [Line Items]
Deliverable power generation capacity, megawatts \| MW								55
Pinnacle Repowering Partnership LLC \| CEG \| Noncontrolling Interest
Schedule of Equity Method Investments [Line Items]
Allocations of taxable income after (as a percentage)			15.00%			15.00%
Contributions from CEG, non-cash	$ 27
Payments to acquire productive assets	$ 21
Pinnacle Repowering Partnership LLC \| Capital Unit, Class A
Schedule of Equity Method Investments [Line Items]
Economic Interest			100.00%			100.00%
Pinnacle Repowering Partnership LLC \| Capital Unit, Class B
Schedule of Equity Method Investments [Line Items]
Economic Interest			100.00%			100.00%

Investments Accounted for by _5

Investments Accounted for by the Equity Method and Variable Interest Entities - Unconsolidated Entities (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Equity investments in affiliates	$ 639	$ 741
Avenal
Schedule of Equity Method Investments [Line Items]
Economic Interest	50.00%
Equity investments in affiliates	$ (3)
Desert Sunlight
Schedule of Equity Method Investments [Line Items]
Economic Interest	25.00%
Equity investments in affiliates	$ 244
Elkhorn Ridge
Schedule of Equity Method Investments [Line Items]
Economic Interest	67.00%
Equity investments in affiliates	$ 34
GenConn
Schedule of Equity Method Investments [Line Items]
Economic Interest	50.00%
Equity investments in affiliates	$ 88
San Juan Mesa
Schedule of Equity Method Investments [Line Items]
Economic Interest	75.00%
Equity investments in affiliates	$ 29
Utah Solar Portfolio
Schedule of Equity Method Investments [Line Items]
Economic Interest	50.00%
Equity investments in affiliates	$ 247

Fair Value of Financial Instr_3

Fair Value of Financial Instruments - Balance Sheet Grouping (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, including current portion	$ 8,030	$ 7,048
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, including current portion	8,006	7,020
Fair Value \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, including current portion	2,166	1,905
Fair Value \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, including current portion	$ 5,840	$ 5,115

Fair Value of Financial Instr_4

Fair Value of Financial Instruments - Recurring Fair Value (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	$ 4				$ 4		$ 1
Derivative Liabilities	189				189		173
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Change in unrealized losses included in earnings for derivatives and other financial instruments held as of June 30, 2021	0	$ 11	$ 4	$ (12)
Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	4				4		1
Derivative Liabilities	86				86		129
Commodity contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liabilities	103				103		44
Fair Value, Recurring \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	4				4		1
Derivative Liabilities	86				86		129
Fair Value, Recurring \| Level 2 \| Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	4				4		1
Derivative Liabilities	86				86		129
Fair Value, Recurring \| Level 2 \| Other Financial Instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	0				0		0
Fair Value, Recurring \| Level 2 \| Commodity contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liabilities	0				0		0
Fair Value, Recurring \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	24				24		29
Derivative Liabilities	103				103		44
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	(39)	(15)	(14)	(9)	(15)	$ (9)
Total losses for the period included in earnings	(33)		(3)		(57)	(8)
Purchases	(9)		0		(9)	0
Settlements	2		0		2	0
Ending balance	(79)	$ (39)	(17)	$ (14)	(79)	(17)
Change in unrealized losses included in earnings for derivatives and other financial instruments held as of June 30, 2021	(33)				(57)
Fair Value, Recurring \| Level 3 \| Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	0				0		0
Derivative Liabilities	0				0		0
Fair Value, Recurring \| Level 3 \| Other Financial Instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	24				24		29
Fair Value, Recurring \| Level 3 \| Commodity contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liabilities	$ 103				$ 103		$ 44

Fair Value of Financial Instr_5

Fair Value of Financial Instruments - Narrative (Details) $ in Millions	Jun. 30, 2021USD ($)
Fair Value Disclosures [Abstract]
Percent of derivative liabilities using level 3 fair value inputs	54.00%
Percent of other financial instruments using Level 3 fair value inputs	100.00%
Fair value assets, measured on recurring basis, valuation techniques, impact of credit reserve to fair value	$ 9

Fair Value of Financial Instr_6

Fair Value of Financial Instruments - Significant Unobservable Inputs (Details) - Fair Value, Recurring - Level 3 $ in Millions	Jun. 30, 2021USD ($)$ / MWh
Power Contracts
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset \| $	$ 0
Derivative liability \| $	$ (103)
Power Contracts \| Low \| Measurement Input, Commodity Forward Price \| Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liability measurement input	12.56
Power Contracts \| High \| Measurement Input, Commodity Forward Price \| Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liability measurement input	58.94
Power Contracts \| Weighted Average \| Measurement Input, Commodity Forward Price \| Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liability measurement input	25.95
Other Financial Instruments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset \| $	$ 24
Derivative liability \| $	$ 0
Other Financial Instruments \| Low \| Measurement Input, Commodity Forward Price \| Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liability measurement input	80,872
Other Financial Instruments \| High \| Measurement Input, Commodity Forward Price \| Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liability measurement input	129,913
Other Financial Instruments \| Weighted Average \| Measurement Input, Commodity Forward Price \| Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liability measurement input	124,783

Derivative Instruments and He_3

Derivative Instruments and Hedging Activities - Volumetric Underlying Derivative Transactions (Details) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2021USD ($)MMBTUMWh	Dec. 31, 2020USD ($)MMBTUMWh
Natural Gas \| Long
Derivatives, Fair Value [Line Items]
Derivative nonmonetary notional amount (energy measure) \| MMBTU	1	1
Power \| Short
Derivatives, Fair Value [Line Items]
Derivative nonmonetary notional amount (energy measure) \| MWh	13	8
Interest \| Long
Derivatives, Fair Value [Line Items]
Derivative, notional amount \| $	$ 1,486	$ 1,600

Derivative Instruments and He_4

Derivative Instruments and Hedging Activities - FV of Derivatives (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 4	$ 1
Derivative Liabilities	189	173
Derivatives Designated as Cash Flow Hedges:
Derivatives, Fair Value [Line Items]
Derivative Assets	0	0
Derivative Liabilities	14	23
Derivatives Designated as Cash Flow Hedges: \| Interest rate contracts current
Derivatives, Fair Value [Line Items]
Derivative Assets	0	0
Derivative Liabilities	7	8
Derivatives Designated as Cash Flow Hedges: \| Interest rate contracts long-term
Derivatives, Fair Value [Line Items]
Derivative Assets	0	0
Derivative Liabilities	7	15
Derivatives Not Designated as Cash Flow Hedges:
Derivatives, Fair Value [Line Items]
Derivative Assets	4	1
Derivative Liabilities	175	150
Derivatives Not Designated as Cash Flow Hedges: \| Interest rate contracts current
Derivatives, Fair Value [Line Items]
Derivative Assets	0	0
Derivative Liabilities	23	25
Derivatives Not Designated as Cash Flow Hedges: \| Interest rate contracts long-term
Derivatives, Fair Value [Line Items]
Derivative Assets	4	1
Derivative Liabilities	49	81
Derivatives Not Designated as Cash Flow Hedges: \| Commodity contracts current
Derivatives, Fair Value [Line Items]
Derivative Assets	0	0
Derivative Liabilities	14	5
Derivatives Not Designated as Cash Flow Hedges: \| Commodity contracts long-term
Derivatives, Fair Value [Line Items]
Derivative Assets	0	0
Derivative Liabilities	$ 89	$ 39

Derivative Instruments and He_5

Derivative Instruments and Hedging Activities - Summary of Offsetting of Derivatives by Counterparty Master Agreement Level (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Derivative liability, Gross Amounts of Recognized Assets/Liabilities	$ (189)	$ (173)
Derivative assets, Gross Amount of Recognized Assets/Liabilities	4	1
Total derivative instruments, Gross Amounts Recognized Assets/Liabilities	(185)	(172)
Total derivative instruments, Derivative Instruments	0	0
Total derivative instruments, Net Amount	(185)	(172)
Commodity contracts
Derivatives, Fair Value [Line Items]
Derivative liability, Gross Amounts of Recognized Assets/Liabilities	(103)	(44)
Derivative liability, Derivative Instruments	0	0
Derivative liability, Net Amount	(103)	(44)
Total derivative instruments, Gross Amounts Recognized Assets/Liabilities	(103)	(44)
Total derivative instruments, Derivative Instruments	0	0
Total derivative instruments, Net Amount	(103)	(44)
Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative liability, Gross Amounts of Recognized Assets/Liabilities	(86)	(129)
Derivative liability, Derivative Instruments	4	0
Derivative liability, Net Amount	(82)	(129)
Derivative assets, Gross Amount of Recognized Assets/Liabilities	4	1
Derivative assets, Derivative Instruments	(4)	0
Derivative asset, Net Amount	0	1
Total derivative instruments, Gross Amounts Recognized Assets/Liabilities	(82)	(128)
Total derivative instruments, Derivative Instruments	0	0
Total derivative instruments, Net Amount	$ (82)	$ (128)

Derivative Instruments and He_6

Derivative Instruments and Hedging Activities - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	$ 2,995	$ 2,264	$ 2,715	$ 2,263
Mark-to-market of cash flow hedge accounting contracts	0	4	11	(8)
Balance at end of period	3,003	2,232	3,003	2,232
Accumulated other comprehensive loss	(9)		(9)		$ (14)
Losses expected to be realized from OCL during the next 12 months, net of income tax benefit of $3	(9)		(9)
Accumulated OCL ending balance, income tax benefit	4	7	4	7
Losses expected to be realized from OCL during the next 12 months, tax expense (benefit)	3		3
AOCI Including Portion Attributable to Noncontrolling Interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(19)	(43)	(30)	(31)
Balance at end of period	(19)	(39)	(19)	(39)
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassified from accumulated OCL to income due to realization of previously deferred amounts	2	1	4	3
Mark-to-market of cash flow hedge accounting contracts	(2)	3	7	(11)
AOCI Attributable to Noncontrolling Interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Accumulated other comprehensive loss	(10)	(20)	(10)	(20)
Accumulated Other Comprehensive Loss
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(10)	(21)	(14)	(15)
Balance at end of period	(9)	(19)	(9)	(19)
Accumulated other comprehensive loss	$ (9)	$ (19)	$ (9)	$ (19)

Derivative Instruments and He_7

Derivative Instruments and Hedging Activities - Impact to Statement of Operations (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Interest Rate Contracts (Interest expense)	$ 0	$ 11	$ 4	$ (12)
Interest rate contracts \| Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Interest Rate Contracts (Interest expense)	(11)		(13)		$ 36	$ (92)
Power Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Commodity Contracts (Mark-to-market economic hedging activities)	$ (28)		$ (3)		$ (50)	$ (8)

Long-term Debt - Schedule of De

Long-term Debt - Schedule of Debt (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Mar. 09, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total debt	$ 8,026		$ 7,043
Less current maturities	(518)		(384)
Less net debt issuance costs	(78)		(79)
Add premiums	4		5
Total long-term debt	7,434		6,585
2025 Senior Notes
Debt Instrument [Line Items]
Total debt	$ 0		600
Debt instrument, interest rate, stated percentage	5.75%
2026 Senior Notes
Debt Instrument [Line Items]
Total debt	$ 350		350
Debt instrument, interest rate, stated percentage	5.00%
2028 Senior Notes
Debt Instrument [Line Items]
Total debt	$ 850		850
Debt instrument, interest rate, stated percentage	4.75%
2031 Senior Notes
Debt Instrument [Line Items]
Total debt	$ 925		0
Debt instrument, interest rate, stated percentage	3.75%	3.75%
Clearway Energy LLC and Clearway Energy Operating LLC Revolving Credit Facility, due 2023
Debt Instrument [Line Items]
Total debt	$ 67		0
Clearway Energy LLC and Clearway Energy Operating LLC Revolving Credit Facility, due 2023 \| LIBOR
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.75%
Clearway Energy LLC and Clearway Energy Operating LLC Revolving Credit Facility, due 2023 \| Letter of Credit
Debt Instrument [Line Items]
Letters of credit outstanding, amount	$ 88
Subtotal project-level debt:
Debt Instrument [Line Items]
Total debt	5,834		5,243
Agua Caliente Solar LLC, due 2037
Debt Instrument [Line Items]
Total debt	$ 712		0
Agua Caliente Solar LLC, due 2037 \| Minimum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	239.50%
Agua Caliente Solar LLC, due 2037 \| Maximum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	363.30%
Agua Caliente Solar LLC, due 2037 \| Letter of Credit
Debt Instrument [Line Items]
Letters of credit outstanding, amount	$ 44
Alta Wind Asset Management LLC, due 2031
Debt Instrument [Line Items]
Total debt	$ 14		14
Alta Wind Asset Management LLC, due 2031 \| LIBOR
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	2.625%
Alta Wind Asset Management LLC, due 2031 \| Letter of Credit
Debt Instrument [Line Items]
Letters of credit outstanding, amount	$ 26
Alta Wind I-V lease financing arrangements, due 2034 and 2035
Debt Instrument [Line Items]
Total debt	$ 772		800
Alta Wind I-V lease financing arrangements, due 2034 and 2035 \| Minimum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	5.696%
Alta Wind I-V lease financing arrangements, due 2034 and 2035 \| Maximum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	7.015%
Alta Wind I-V lease financing arrangements, due 2034 and 2035 \| Letter of Credit
Debt Instrument [Line Items]
Letters of credit outstanding, amount	$ 0
Alta Wind Realty Investments LLC, due 2031
Debt Instrument [Line Items]
Total debt	$ 25		25
Debt instrument, interest rate, stated percentage	700.00%
Alta Wind Realty Investments LLC, due 2031 \| Letter of Credit
Debt Instrument [Line Items]
Letters of credit outstanding, amount	$ 0
Borrego, due 2024 and 2038
Debt Instrument [Line Items]
Total debt	57		57
Borrego, due 2024 and 2038 \| Letter of Credit
Debt Instrument [Line Items]
Letters of credit outstanding, amount	4
Buckthorn Solar, due 2025
Debt Instrument [Line Items]
Total debt	$ 125		126
Buckthorn Solar, due 2025 \| LIBOR
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.75%
Buckthorn Solar, due 2025 \| Letter of Credit
Debt Instrument [Line Items]
Letters of credit outstanding, amount	$ 23
Carlsbad Energy Holdings LLC, due 2027
Debt Instrument [Line Items]
Total debt	$ 156		156
Carlsbad Energy Holdings LLC, due 2027 \| LIBOR
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.625%
Carlsbad Energy Holdings LLC, due 2027 \| Letter of Credit
Debt Instrument [Line Items]
Letters of credit outstanding, amount	$ 82
Carlsbad Energy Holdings LLC, due 2038
Debt Instrument [Line Items]
Total debt	$ 407		407
Debt instrument, interest rate, stated percentage	4.12%
Carlsbad Energy Holdings LLC, due 2038 \| Letter of Credit
Debt Instrument [Line Items]
Letters of credit outstanding, amount	$ 0
Carlsbad Holdco, due 2038
Debt Instrument [Line Items]
Total debt	$ 210		210
Debt instrument, interest rate, stated percentage	4.21%
Carlsbad Holdco, due 2038 \| Letter of Credit
Debt Instrument [Line Items]
Letters of credit outstanding, amount	$ 10
CVSR Holdco Notes, due 2037
Debt Instrument [Line Items]
Total debt	$ 169		176
Debt instrument, interest rate, stated percentage	4.68%
CVSR Holdco Notes, due 2037 \| Letter of Credit
Debt Instrument [Line Items]
Letters of credit outstanding, amount	$ 13
CVSR, due 2037
Debt Instrument [Line Items]
Total debt	$ 662		675
CVSR, due 2037 \| Minimum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	2.339%
CVSR, due 2037 \| Maximum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	3.775%
CVSR, due 2037 \| Letter of Credit
Debt Instrument [Line Items]
Letters of credit outstanding, amount	$ 0
DG-CS Master Borrower LLC, due 2040
Debt Instrument [Line Items]
Total debt	$ 462		467
Debt instrument, interest rate, stated percentage	3.51%
DG-CS Master Borrower LLC, due 2040 \| Letter of Credit
Debt Instrument [Line Items]
Letters of credit outstanding, amount	$ 30
Duquesne, due 2059
Debt Instrument [Line Items]
Total debt	$ 95		95
Debt instrument, interest rate, stated percentage	4.62%
Duquesne, due 2059 \| Letter of Credit
Debt Instrument [Line Items]
Letters of credit outstanding, amount	$ 0
El Segundo Energy Center, due 2023
Debt Instrument [Line Items]
Total debt	$ 213		250
El Segundo Energy Center, due 2023 \| Minimum \| LIBOR
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.875%
El Segundo Energy Center, due 2023 \| Maximum \| LIBOR
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.50%
El Segundo Energy Center, due 2023 \| Letter of Credit
Debt Instrument [Line Items]
Letters of credit outstanding, amount	$ 138
Energy Center Minneapolis Series D, E, F, G, H Notes, due 2025-2037
Debt Instrument [Line Items]
Total debt	327		327
Energy Center Minneapolis Series D, E, F, G, H Notes, due 2025-2037 \| Letter of Credit
Debt Instrument [Line Items]
Letters of credit outstanding, amount	0
Kawailoa Solar Portfolio LLC, due 2026
Debt Instrument [Line Items]
Total debt	$ 80		81
Kawailoa Solar Portfolio LLC, due 2026 \| LIBOR
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.375%
Kawailoa Solar Portfolio LLC, due 2026 \| Letter of Credit
Debt Instrument [Line Items]
Letters of credit outstanding, amount	$ 15
Laredo Ridge, due 2028
Debt Instrument [Line Items]
Total debt	$ 75		78
Laredo Ridge, due 2028 \| LIBOR
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.125%
Laredo Ridge, due 2028 \| Letter of Credit
Debt Instrument [Line Items]
Letters of credit outstanding, amount	$ 9
Marsh Landing, due 2023
Debt Instrument [Line Items]
Total debt	$ 129		146
Marsh Landing, due 2023 \| LIBOR
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.375%
Marsh Landing, due 2023 \| Letter of Credit
Debt Instrument [Line Items]
Letters of credit outstanding, amount	$ 99
NIMH Solar, due 2024
Debt Instrument [Line Items]
Total debt	$ 185		191
NIMH Solar, due 2024 \| LIBOR
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.00%
NIMH Solar, due 2024 \| Letter of Credit
Debt Instrument [Line Items]
Letters of credit outstanding, amount	$ 16
Oahu Solar Holdings LLC, due 2026
Debt Instrument [Line Items]
Total debt	$ 88		89
Oahu Solar Holdings LLC, due 2026 \| LIBOR
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.375%
Oahu Solar Holdings LLC, due 2026 \| Letter of Credit
Debt Instrument [Line Items]
Letters of credit outstanding, amount	$ 11
Pinnacle Repowering Partnership Holdco LLC, due 2021
Debt Instrument [Line Items]
Total debt	$ 90		0
Pinnacle Repowering Partnership Holdco LLC, due 2021 \| LIBOR
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.01%
Pinnacle Repowering Partnership Holdco LLC, due 2021 \| Letter of Credit
Debt Instrument [Line Items]
Letters of credit outstanding, amount	$ 2
Rosie Class B LLC, due 2027
Debt Instrument [Line Items]
Total debt	$ 80		80
Rosie Class B LLC, due 2027 \| LIBOR
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.75%
Rosie Class B LLC, due 2027 \| Letter of Credit
Debt Instrument [Line Items]
Letters of credit outstanding, amount	$ 21
Tapestry Wind LLC, due 2031
Debt Instrument [Line Items]
Total debt	$ 88		143
Tapestry Wind LLC, due 2031 \| LIBOR
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.375%
Tapestry Wind LLC, due 2031 \| Letter of Credit
Debt Instrument [Line Items]
Letters of credit outstanding, amount	$ 11
Utah Solar Holdings, due 2036
Debt Instrument [Line Items]
Total debt	$ 284		290
Debt instrument, interest rate, stated percentage	3.59%
Utah Solar Holdings, due 2036 \| Letter of Credit
Debt Instrument [Line Items]
Letters of credit outstanding, amount	$ 16
Walnut Creek, due 2023
Debt Instrument [Line Items]
Total debt	$ 110		126
Walnut Creek, due 2023 \| LIBOR
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.75%
Walnut Creek, due 2023 \| Letter of Credit
Debt Instrument [Line Items]
Letters of credit outstanding, amount	$ 103
WCEP Holdings, LLC, due 2023
Debt Instrument [Line Items]
Total debt	$ 32		35
WCEP Holdings, LLC, due 2023 \| LIBOR
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	3.00%
WCEP Holdings, LLC, due 2023 \| Letter of Credit
Debt Instrument [Line Items]
Letters of credit outstanding, amount	$ 0
Other
Debt Instrument [Line Items]
Total debt	187		$ 199
Other \| Letter of Credit
Debt Instrument [Line Items]
Letters of credit outstanding, amount	$ 38

Long-term Debt - Narrative (Det

Long-term Debt - Narrative (Details) - USD ($)	Mar. 10, 2021	Jul. 31, 2021	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Mar. 17, 2021	Mar. 11, 2021	Mar. 09, 2021	Feb. 03, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Proceeds from the revolving credit facility					$ 300,000,000	$ 265,000,000
Payments for the revolving credit facility					233,000,000	265,000,000
Loss on debt extinguishment			$ 0	$ 0	42,000,000	$ 3,000,000
Debt instrument, carrying amount			8,026,000,000		8,026,000,000						$ 7,043,000,000
Clearway Energy LLC and Clearway Energy Operating LLC Revolving Credit Facility, due 2023
Debt Instrument [Line Items]
Line of credit facility, fair value of amount outstanding			67,000,000		67,000,000
Proceeds from the revolving credit facility					300,000,000
Payments for the revolving credit facility					233,000,000
Debt instrument, carrying amount			67,000,000		$ 67,000,000						0
Clearway Energy LLC and Clearway Energy Operating LLC Revolving Credit Facility, due 2023 \| Subsequent Event
Debt Instrument [Line Items]
Line of credit facility, fair value of amount outstanding		$ 0
Repayments of debt		67,000,000
Clearway Energy LLC and Clearway Energy Operating LLC Revolving Credit Facility, due 2023 \| LIBOR
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate					1.75%
Agua Caliente Solar, LLC, Nonrecourse Credit Agreement, Federal Financing Bank, Due 2037
Debt Instrument [Line Items]
Debt instrument, face amount										$ 716,000,000
Agua Caliente Solar, LLC, Nonrecourse Credit Agreement, Federal Financing Bank, Due 2037 \| Minimum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage										2.395%
Agua Caliente Solar, LLC, Nonrecourse Credit Agreement, Federal Financing Bank, Due 2037 \| Maximum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage										3.633%
Project level debt
Debt Instrument [Line Items]
Debt instrument, carrying amount			5,834,000,000		$ 5,834,000,000						5,243,000,000
Utah Solar Holdings, due 2036
Debt Instrument [Line Items]
Debt instrument, carrying amount			$ 284,000,000		$ 284,000,000						290,000,000
Debt instrument, interest rate, stated percentage			3.59%		3.59%
2031 Senior Notes
Debt Instrument [Line Items]
Borrowings									$ 925,000,000
Debt instrument, carrying amount			$ 925,000,000		$ 925,000,000						0
Debt instrument, interest rate, stated percentage			3.75%		3.75%				3.75%
2025 Senior Notes
Debt Instrument [Line Items]
Debt instrument, repurchased face amount									$ 411,000,000
Repurchased amount, percent of face value									68.60%
Repurchased face amount, subject to guaranteed delivery procedures								$ 6,000,000
Exercised optionally redeemable remaining principal amount, not validly tendered and purchased in tender offer							$ 183,000,000
Debt instrument, redemption price, percentage					106.00%
Repurchase amount, total consideration			$ 636,000,000		$ 636,000,000
Loss on debt extinguishment					(36,000,000)
Additional loss on extinguishment to write off deferred financing fees					5,000,000
Debt instrument, carrying amount			$ 0		$ 0						600,000,000
Debt instrument, interest rate, stated percentage			5.75%		5.75%
Tapestry Wind LLC, due 2031
Debt Instrument [Line Items]
Repayments of debt	$ 53,000,000
Debt instrument, carrying amount			$ 88,000,000		$ 88,000,000						$ 143,000,000
Tapestry Wind LLC, due 2031 \| LIBOR
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate					1.375%
Letter of Credit \| Clearway Energy LLC and Clearway Energy Operating LLC Revolving Credit Facility, due 2023
Debt Instrument [Line Items]
Letters of credit outstanding, amount			88,000,000		$ 88,000,000
Letter of Credit \| Clearway Energy LLC and Clearway Energy Operating LLC Revolving Credit Facility, due 2023 \| Subsequent Event
Debt Instrument [Line Items]
Letters of credit outstanding, amount		$ 75,000,000
Letter of Credit \| Utah Solar Holdings, due 2036
Debt Instrument [Line Items]
Letters of credit outstanding, amount			16,000,000		16,000,000
Letter of Credit \| Tapestry Wind LLC, due 2031
Debt Instrument [Line Items]
Letters of credit outstanding, amount			$ 11,000,000		$ 11,000,000
Construction loans \| Pinnacle Repowering Partnership LLC
Debt Instrument [Line Items]
Debt instrument, face amount	126,000,000
Debt instrument, carrying amount	$ 79,000,000
Construction loans \| Pinnacle Repowering Partnership LLC \| LIBOR
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.00%

Earnings Per Share - Schedule o

Earnings Per Share - Schedule of Reconciliation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net Income (Loss) Available to Common Stockholders, Basic [Abstract]
Net income attributable to Clearway Energy, Inc.	$ 35	$ 47	$ 38	$ 18
Common Class A
Net Income (Loss) Available to Common Stockholders, Basic [Abstract]
Net income attributable to Clearway Energy, Inc.	$ 10	$ 14	$ 11	$ 6
Weighted average number of common shares outstanding - basic (in shares)	35	35	35	35
Weighted average number of common shares outstanding - diluted (in shares)	35	35	35	35
Earnings (loss) per weighted average common share — basic (in dollars per share)	$ 0.30	$ 0.41	$ 0.32	$ 0.16
Earnings (loss) per weighted average common share — diluted (in dollars per share)	$ 0.30	$ 0.41	$ 0.32	$ 0.16
Common Class C
Net Income (Loss) Available to Common Stockholders, Basic [Abstract]
Net income attributable to Clearway Energy, Inc.	$ 25	$ 33	$ 27	$ 13
Weighted average number of common shares outstanding - basic (in shares)	82	80	82	79
Weighted average number of common shares outstanding - diluted (in shares)	82	80	82	79
Earnings (loss) per weighted average common share — basic (in dollars per share)	$ 0.30	$ 0.41	$ 0.32	$ 0.16
Earnings (loss) per weighted average common share — diluted (in dollars per share)	$ 0.30	$ 0.41	$ 0.32	$ 0.16

Earnings Per Share - Antidiluti

Earnings Per Share - Antidilutive Equity Instruments Not Included in Calculation of Earnings Per Share (Details) shares in Millions	6 Months Ended
	Jun. 30, 2020shares
Common Class C \| 2020 Convertible Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Outstanding antidilutive equity instruments (in shares)	2

Segment Reporting (Details)

Segment Reporting (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
Segment Reporting (Details) - USD ($) $ in Millions	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Operating revenue	$ 380		$ 329		$ 617	$ 587
Cost of operations, exclusive of depreciation, amortization and accretion shown separately below	107		87		217	180
Depreciation, amortization and accretion	128		99		256	201
General and administrative	10		12		20	21
Transaction and integration costs	1				3	1
Development costs	1		1		2	2
Operating Income	133		130		119	182
Equity in earnings of unconsolidated affiliates	8		16		12	3
Gain on sale of unconsolidated affiliate	0		49		0	49
Other income, net	1		0		2	2
Loss on debt extinguishment	0		0		(42)	(3)
Interest expense	(103)		(93)		(148)	(260)
Income (Loss) Before Income Taxes	39		102		(57)	(27)
Income tax expense (benefit)	7		26		(13)	4
Net Income (Loss)	32	$ (78)	76	$ (107)	(44)	(31)
Total Assets	11,881				11,881		$ 10,592
Operating Segments
Segment Reporting Information [Line Items]
Operating revenue	380		329		617	587
Operating Segments \| Conventional Generation
Segment Reporting Information [Line Items]
Operating revenue	109		107		211	210
Cost of operations, exclusive of depreciation, amortization and accretion shown separately below	23		22		50	46
Depreciation, amortization and accretion	31		33		65	66
General and administrative	0		0		0	0
Transaction and integration costs	0				0	0
Development costs	0		0		0	0
Operating Income	55		52		96	98
Equity in earnings of unconsolidated affiliates	2		1		4	3
Gain on sale of unconsolidated affiliate			0			0
Other income, net	(1)				0	0
Loss on debt extinguishment					0	0
Interest expense	(16)		(22)		(27)	(52)
Income (Loss) Before Income Taxes	40		31		73	49
Income tax expense (benefit)	0		0		0	0
Net Income (Loss)	40		31		73	49
Total Assets	2,500				2,500
Operating Segments \| Renewables
Segment Reporting Information [Line Items]
Operating revenue	222		180		308	287
Cost of operations, exclusive of depreciation, amortization and accretion shown separately below	54		39		106	75
Depreciation, amortization and accretion	89		59		176	121
General and administrative	1		1		1	1
Transaction and integration costs	0				0	0
Development costs	0		0		0	0
Operating Income	78		81		25	90
Equity in earnings of unconsolidated affiliates	6		15		8	0
Gain on sale of unconsolidated affiliate			0			0
Other income, net	1				1	1
Loss on debt extinguishment					(1)	0
Interest expense	(58)		(42)		(62)	(151)
Income (Loss) Before Income Taxes	27		54		(29)	(60)
Income tax expense (benefit)	0		0		0	0
Net Income (Loss)	27		54		(29)	(60)
Total Assets	8,617				8,617
Operating Segments \| Thermal
Segment Reporting Information [Line Items]
Operating revenue	49		42		98	90
Cost of operations, exclusive of depreciation, amortization and accretion shown separately below	31		26		62	59
Depreciation, amortization and accretion	8		7		15	14
General and administrative	0		2		1	3
Transaction and integration costs	0				0	0
Development costs	1		1		2	2
Operating Income	9		6		18	12
Equity in earnings of unconsolidated affiliates	0		0		0	0
Gain on sale of unconsolidated affiliate			0			0
Other income, net	1				1	1
Loss on debt extinguishment					0	0
Interest expense	(4)		(5)		(9)	(10)
Income (Loss) Before Income Taxes	6		1		10	3
Income tax expense (benefit)	0		0		0	0
Net Income (Loss)	6		1		10	3
Total Assets	621				621
Corporate
Segment Reporting Information [Line Items]
Operating revenue	0		0		0	0
Cost of operations, exclusive of depreciation, amortization and accretion shown separately below	(1)		0		(1)	0
Depreciation, amortization and accretion	0		0		0	0
General and administrative	9		9		18	17
Transaction and integration costs	1				3	1
Development costs	0		0		0	0
Operating Income	(9)		(9)		(20)	(18)
Equity in earnings of unconsolidated affiliates	0		0		0	0
Gain on sale of unconsolidated affiliate			49			49
Other income, net	0				0	0
Loss on debt extinguishment					(41)	(3)
Interest expense	(25)		(24)		(50)	(47)
Income (Loss) Before Income Taxes	(34)		16		(111)	(19)
Income tax expense (benefit)	7		26		(13)	4
Net Income (Loss)	(41)		$ (10)		(98)	$ (23)
Total Assets	$ 143				$ 143

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Income Taxes (Details) - USD ($) $ in Millions	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Income (loss) before income tax	$ 39	$ 102	$ (57)	$ (27)
Income tax expense (benefit)	$ 7	$ 26	$ (13)	$ 4
Effective income tax rate	17.90%	25.50%	22.80%	(14.80%)

Related Party Transactions (Det

Related Party Transactions (Details) $ in Millions	3 Months Ended		6 Months Ended
Related Party Transactions (Details) $ in Millions	Jun. 30, 2021USD ($)subsidiary	Jun. 30, 2020USD ($)	Jun. 30, 2021USD ($)subsidiary	Jun. 30, 2020USD ($)	Dec. 31, 2020USD ($)
Related Party Transaction
General and administrative expense	$ 10	$ 12	$ 20	$ 21
RENOM
Related Party Transaction
Expenses from transactions with related party	14	9	27	18
Due to affiliate	10		10		$ 10
CEG
Related Party Transaction
Expenses from transactions with related party	$ 4	2	$ 7	4
Number of wholly owned subsidiaries \| subsidiary	2		2
General and administrative expense	$ 1	$ 0.6	$ 2	$ 1.2