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Operations and Significant Accounting Policies - Non-Controlling Interest (Details)
 12 Months Ended
Dec. 31, 2021
MW
Glen Ullin Energy Center [Member]  
Non-Controlling Interest Details [Line Items]  
Generating Capacity Subject to Tax Equity Financing 106
South Peak [Member]  
Non-Controlling Interest Details [Line Items]  
Generating Capacity Subject to Tax Equity Financing 80
Diamond Spring [Member]  
Non-Controlling Interest Details [Line Items]  
Generating Capacity Subject to Tax Equity Financing 303
Caddo [Member]  
Non-Controlling Interest Details [Line Items]  
Generating Capacity Subject to Tax Equity Financing 303
Nobles 2 [Member]  
Non-Controlling Interest Details [Line Items]  
Generating Capacity Subject to Tax Equity Financing 250