v3.26.1
Debt - Schedule of Credit Facilities and Loan Agreements (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Oct. 31, 2025
Mar. 31, 2026
Dec. 31, 2025
Dec. 24, 2025
Dec. 31, 2024
Aug. 08, 2024
Jul. 30, 2024
Debt Instrument [Line Items]              
Total debt   $ 1,321,406 $ 1,298,612   $ 1,110,856    
Less: Total unamortized discount and deferred financing costs   (26,451) (26,785)   (20,301)    
Less: Current portion of long-term debt   (25,373) (24,056)   (88,901)    
Total long-term debt, net   1,269,582 1,247,771   1,001,654    
Unamortized debt discount and deferred financing fees, current   2,300 4,500   6,300    
Current portion of long-term debt, gross   (27,700) (28,600)   (95,200)    
Trillium Manager LLC | Construction, Revolving and Term Loans              
Debt Instrument [Line Items]              
Total debt   $ 62,669 $ 62,975   65,758    
Basis spread on variable rate (in percent)   2.10% 2.10%        
Greenbacker Wind Holdings II LLC | Loans Payable              
Debt Instrument [Line Items]              
Total debt   $ 64,414 $ 64,414   68,838    
Basis spread on variable rate (in percent)   2.15% 2.15%        
Conic Manager LLC | Loans Payable              
Debt Instrument [Line Items]              
Total debt   $ 20,934 $ 21,076   22,308    
Basis spread on variable rate (in percent)   1.75% 1.75%        
Conic Manager LLC | Secured Debt              
Debt Instrument [Line Items]              
Basis spread on variable rate (in percent)     1.75%        
Greenbacker Renewable Energy Corporation (Premium financing agreement) | Premium Financing Loan              
Debt Instrument [Line Items]              
Total debt   $ 441 $ 1,699   2,012    
Interest rate   7.15% 7.15%     6.78%  
Gemstone 2025 Manager LLC | Loans Payable              
Debt Instrument [Line Items]              
Total debt $ 52,500 $ 52,502 $ 52,502   0    
Basis spread on variable rate (in percent) 2.25% 2.25% 2.25%        
GB Solar TE 2020 Manager LLC | Secured Debt              
Debt Instrument [Line Items]              
Total debt   $ 13,658 $ 13,688   17,330    
Basis spread on variable rate (in percent)   2.10% 2.10%        
Sego Lily Solar Manager LLC | Secured Debt              
Debt Instrument [Line Items]              
Total debt   $ 119,071 $ 121,488   127,829    
Basis spread on variable rate (in percent)   1.53% 1.53%        
GRP II Borealis Solar LLC | Secured Debt              
Debt Instrument [Line Items]              
Total debt   $ 38,184 $ 38,752   39,429    
Basis spread on variable rate (in percent)   2.26% 2.26%        
Ponderosa Manager LLC | Construction Loan              
Debt Instrument [Line Items]              
Total debt   $ 85,363 $ 85,363   87,803    
Basis spread on variable rate (in percent)   1.40% 1.40%        
PRC Nemasket LLC | Loans Payable              
Debt Instrument [Line Items]              
Total debt   $ 35,706 $ 37,486   39,630    
Basis spread on variable rate (in percent)   1.25% 1.25%        
GREC Holdings 1 LLC | Line of Credit | Revolving Credit Facility              
Debt Instrument [Line Items]              
Total debt   $ 72,600 $ 67,600   129,594    
GREC Holdings 1 LLC | Line of Credit | Revolving Credit Facility | Minimum              
Debt Instrument [Line Items]              
Basis spread on variable rate (in percent)   1.85% 1.85%        
GREC Holdings 1 LLC | Line of Credit | Revolving Credit Facility | Maximum              
Debt Instrument [Line Items]              
Basis spread on variable rate (in percent)   2.10% 2.10%        
GREC Warehouse Holdings I LLC | Line of Credit | Revolving Credit Facility              
Debt Instrument [Line Items]              
Total debt   $ 78,240 $ 89,179   102,334    
Basis spread on variable rate (in percent)   2.28% 2.28%        
Cider Solar Construction Owner LLC | Loans Payable              
Debt Instrument [Line Items]              
Total debt   $ 81,000 $ 81,000   81,000    
Interest rate       14.00%     9.75%
Cider Solar Construction Owner LLC | Loans Payable | Minimum              
Debt Instrument [Line Items]              
Interest rate   12.25% 12.25%        
Cider Solar Construction Owner LLC | Loans Payable | Maximum              
Debt Instrument [Line Items]              
Interest rate   14.00% 14.00%        
Cider Solar Manager LLC | Loans Payable              
Debt Instrument [Line Items]              
Total debt   $ 520,879 $ 485,645        
Pemaquid Manager LLC | Loans Payable              
Debt Instrument [Line Items]              
Total debt   $ 75,745 $ 75,745   $ 76,915    
Basis spread on variable rate (in percent)   1.85% 1.85%