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Nature of Business (Details)
MW in Thousands, customer in Millions
Jan. 05, 2021
state
customer
province
Dec. 31, 2020
MW
Aug. 01, 2019
state
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Generation capacity (in MW) | MW   23  
Business Acquisition [Line Items]      
Number of states in which the entity operates | state     9
Subsequent Event      
Business Acquisition [Line Items]      
Customers served (over) | customer 6    
Direct Energy | Subsequent Event      
Business Acquisition [Line Items]      
Customers served (over) | customer 3    
Direct Energy | U.S. | Subsequent Event      
Business Acquisition [Line Items]      
Number of states in which the entity operates | state 50    
Direct Energy | Canada | Subsequent Event      
Business Acquisition [Line Items]      
Provinces in which entity operates | province 8