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Sale of Bright Canyon Energy (Details) - USD ($)
$ in Thousands
3 Months Ended 5 Months Ended 12 Months Ended
Jan. 30, 2024
Mar. 31, 2025
Mar. 31, 2024
Jan. 12, 2024
Dec. 31, 2024
Dec. 31, 2023
Aug. 04, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Gain on sale relating to BCE   $ 0 $ 22,988        
Bridge Loan | Equity Bridge Loan Facility | Bright Canyon Energy Corporation              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Debt instrument, face amount             $ 31,000
Term Loan | Non-Recourse Construction Term Loan Facility | Bright Canyon Energy Corporation              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Debt instrument, face amount             36,000
Discontinued Operations, Disposed of by Sale | Bright Canyon Energy Corporation              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Assets held-for-sale       $ 35,000      
Consideration received       108,000     $ 44,000
Gain on sale relating to BCE       29,000 $ 23,000 $ 6,000  
Investment tax credits $ 23,000            
Payments to acquire investment tax credits $ 21,000            
Discontinued Operations, Disposed of by Sale | Bright Canyon Energy Corporation | Ameresco, Inc.              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Assets held-for-sale       79,000      
Liabilities transferred       $ 41,000