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Equity Method Investment (Details)
1 Months Ended 9 Months Ended
Feb. 28, 2021
USD ($)
Sep. 30, 2021
USD ($)
MW
Sep. 30, 2020
USD ($)
Business Acquisition [Line Items]      
Ownership   50.00%  
Distributions from NMRD   $ 572,000 $ 0
NMRD      
Business Acquisition [Line Items]      
Renewable energy capacity in operating (in mw) | MW   135.1  
PNMR Development      
Business Acquisition [Line Items]      
Ownership   50.00%  
PNMR Development | NMRD      
Business Acquisition [Line Items]      
Ownership   50.00%  
Contribution to construction activities   $ 0 $ 23,300,000
Distributions from NMRD $ 3,000,000    
Earnings from equity method investments, net of dividends or distributions 2,400,000    
Proceeds from equity method investment, distribution, return of capital $ 600,000    
AEP OnSite Partners | NMRD      
Business Acquisition [Line Items]      
Ownership   50.00%