v3.26.1
Cover Page - shares
6 Months Ended
Jun. 30, 2026
Aug. 01, 2026
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2026  
Document Transition Report false  
Entity File Number 000-55610  
Entity Registrant Name GREENBACKER RENEWABLE ENERGY COMPANY LLC  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 80-0872648  
Entity Address, Address Line One 230 Park Avenue  
Entity Address, Address Line Two Suite 1560  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10169  
City Area Code 646  
Local Phone Number 720-9463  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   199,536,636
Entity Central Index Key 0001563922  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2