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Nature of Business and Basis of Presentation - General (Details)
MW in Thousands, customer in Millions
Jan. 05, 2021
customer
state
counterparty
Mar. 31, 2021
MW
Jan. 05, 2021
province
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Generation capacity (in MW) | MW   23  
Business Acquisition [Line Items]      
Customers added (over) | counterparty 3,000,000    
Direct Energy      
Business Acquisition [Line Items]      
Customers added (over) | customer 3    
U.S. | Direct Energy      
Business Acquisition [Line Items]      
States in which entity operates | state 50    
Canada | Direct Energy      
Business Acquisition [Line Items]      
Provinces in which entity operates 8   8