v3.26.1
Debt - Schedule of Credit Facilities and Loan Agreements (Details) - USD ($)
$ in Thousands
 3 Months Ended 7 Months Ended 12 Months Ended
Oct. 31, 2025
Nov. 25, 2021
Feb. 25, 2021
Mar. 31, 2026
Dec. 31, 2022
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)    
GREC Entity HoldCo LLC | Secured Debt                    
Debt Instrument [Line Items]                    
Total debt           $ 0   56,049    
Basis spread on variable rate (in percent)   1.85%       1.85%        
Midway III Manager LLC | Secured Debt                    
Debt Instrument [Line Items]                    
Total debt           $ 0   13,260    
Basis spread on variable rate (in percent)         1.73% 1.73%        
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 | Secured Debt                    
Debt Instrument [Line Items]                    
Basis spread on variable rate (in percent)           1.75%        
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%        
Turquoise Manager LLC | Secured Debt                    
Debt Instrument [Line Items]                    
Total debt           $ 0   30,252    
Basis spread on variable rate (in percent)           1.35%        
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%  
ECA Finco I, LLC | Loans Payable                    
Debt Instrument [Line Items]                    
Total debt           $ 0   17,398    
Basis spread on variable rate (in percent)     2.35%     2.60%        
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%        
Celadon Manager LLC | Secured Debt                    
Debt Instrument [Line Items]                    
Total debt           $ 0   72,853    
Basis spread on variable rate (in percent)           1.60%        
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%        
Dogwood GB Manager LLC | Loans Payable                    
Debt Instrument [Line Items]                    
Total debt           $ 0   58,725    
Basis spread on variable rate (in percent)           1.73%        
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 AcquisitionCo LLC(1) | Loans Payable                    
Debt Instrument [Line Items]                    
Total debt           $ 485,645   1,539    
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%