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Commitment, Contingencies And Guarentees: Power Purchase Agreement - Related Party (Details) - MW
Jan. 01, 2022
Dec. 31, 2020
Oct. 15, 2020
Federal Energy Regulatory Commission (FERC) | Black Hills Wyoming and Wyoming Electric      
Long-term Purchase Commitment [Line Items]      
Megawatts Sold Under Long-Term Contract     60
Number of Megawatts Capacity Purchased     60
Federal Energy Regulatory Commission (FERC) | Black Hills Wyoming and Wyoming Electric | Subsequent Event      
Long-term Purchase Commitment [Line Items]      
Public Utilities Term of Power Purchase Agreement 11 years    
Black Hills Wyoming and Wyoming Electric      
Long-term Purchase Commitment [Line Items]      
Megawatts Sold Under Long-Term Contract   60  
Black Hills Electric Generation and Colorado Electric | Busch Ranch I Wind Farm      
Long-term Purchase Commitment [Line Items]      
Number of Megawatts Capacity Purchased   14.5  
Colorado Electric and Black Hills Colorado IPP      
Long-term Purchase Commitment [Line Items]      
Number of Megawatts Capacity Purchased   200