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Commitment, Contingencies And Guarantees: Power Purchase Agreement - Related Party (Details) - MW | Jan. 01, 2022 | Dec. 31, 2021 | Oct. 15, 2020
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Black Hills Wyoming and Wyoming Electric |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Megawatts Sold Under Long-Term Contract |  | 60 |
Black Hills Wyoming and Wyoming Electric | Federal Energy Regulatory Commission (FERC) |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Megawatts Sold Under Long-Term Contract |  |  | 60
Black Hills Wyoming and Wyoming Electric | Federal Energy Regulatory Commission (FERC) | Subsequent Event |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Public Utilities Term of Power Purchase Agreement | 11 years |  |
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 |

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