v3.24.0.1
COVER PAGE - USD ($)
 12 Months Ended
Dec. 31, 2023
Mar. 01, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-39798    
Entity Registrant Name Altus Power, Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 85-3448396    
Entity Address, Address Line One 2200 Atlantic Street    
Entity Address, Address Line Two 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    
Title of 12(b) Security Class A common stock, par value $0.0001 per share    
Trading Symbol AMPS    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 393,193,278
Entity Common Stock, Shares Outstanding   159,081,159  
Documents Incorporated by Reference
Portions of the registrant’s Definitive Proxy Statement to be filed for its 2024 Annual Meeting of Stockholders are incorporated by reference into the sections of this Form 10-K addressing the requirements of Part III of Form 10-K.
    
Entity Central Index Key 0001828723    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false