v3.22.2.2
Cover Page - shares
 9 Months Ended
Sep. 30, 2022
Oct. 28, 2022
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 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  
Title of 12(b) Security Class A common stock, par value $0.0001 per share  
Trading Symbol AMPS  
Security Exchange Name NYSE  
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 Q3  
Current Fiscal Year End Date --12-31  
Amendment Flag false  
Class A Common Stock    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   158,829,401
Common Class B    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   1,207,500