| Cover | Oct. 15, 2024 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Oct. 15, 2024 |
| Entity Registrant Name | Altus Power, Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-39798 |
| Entity Tax Identification Number | 85-3448396 |
| Entity Address, Address Line One | 2200 Atlantic Street, 6th Floor |
| Entity Address, City or Town | Stamford |
| Entity Address, State or Province | CT |
| Entity Address, Postal Zip Code | 06902 |
| City Area Code | 203 |
| Local Phone Number | 698-0090 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Class A common stock, par value $.0001 |
| Trading Symbol | AMPS |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Entity Central Index Key | 0001828723 |
| Amendment Flag | false |
