Cover Page - shares	3 Months Ended
	Mar. 31, 2022	May 06, 2022
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2022
Document Transition Report	false
Entity File Number	001-04321
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, Sixth 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
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Central Index Key	0001828723
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Amendment Flag	false
Class A Common Stock
Document Information [Line Items]
Title of 12(b) Security	Class A common stock, par value $0.0001 per share
Trading Symbol	AMPS
Security Exchange Name	NYSE
Entity Common Stock, Shares Outstanding		153,650,851
Warrant
Document Information [Line Items]
Title of 12(b) Security	Warrants to purchase one share of common stock, each at an exercise price of $11.00
Trading Symbol	AMPS.WS
Security Exchange Name	NYSE
Common Class B
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		1,207,500