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Jointly Owned Facilities - Related Party (Details)
Dec. 31, 2021
MW
Black Hills Energy, Wyoming Electric | Cheyenne Prairie, Simple-Cycle Combustion Turbine  
Jointly Owned Utility Plant Interests [Line Items]  
Utility Plant, Megawatt Capacity 40
Busch Ranch I Wind Farm | Colorado Electric  
Jointly Owned Utility Plant Interests [Line Items]  
Jointly Owned Utility Plant, Proportionate Ownership Share 50.00%
Busch Ranch I Wind Farm | Black Hills Electric Generation  
Jointly Owned Utility Plant Interests [Line Items]  
Jointly Owned Utility Plant, Proportionate Ownership Share 50.00%
Cheyenne Prairie | Black Hills Energy, Wyoming Electric | Cheyenne Prairie, Combined Cycle  
Jointly Owned Utility Plant Interests [Line Items]  
Utility Plant, Megawatt Capacity 42
Cheyenne Prairie | Black Hills Energy - South Dakota Electric | Cheyenne Prairie, Combined Cycle  
Jointly Owned Utility Plant Interests [Line Items]  
Utility Plant, Megawatt Capacity 58
Cheyenne Prairie | South Dakota Electric and Wyoming Electric | Cheyenne Prairie, Combined Cycle  
Jointly Owned Utility Plant Interests [Line Items]  
Utility Plant, Megawatt Capacity 100
Corriedale Wind Project | Black Hills Energy, Wyoming Electric  
Jointly Owned Utility Plant Interests [Line Items]  
Utility Plant, Megawatt Capacity 20
Corriedale Wind Project | Black Hills Energy - South Dakota Electric  
Jointly Owned Utility Plant Interests [Line Items]  
Utility Plant, Megawatt Capacity 32.5
Corriedale Wind Project | South Dakota Electric and Wyoming Electric  
Jointly Owned Utility Plant Interests [Line Items]  
Utility Plant, Megawatt Capacity 52.5