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Regulatory Matters: Electric Utilities Regulatory Activity (Details) $ in Thousands		12 Months Ended	24 Months Ended
	Oct. 15, 2020 MW	Dec. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)
Black Hills Energy - South Dakota Electric | Federal Energy Regulatory Commission (FERC) Common Use System (CUS)
Public Utilities, General Disclosures [Line Items]
Annual Revenue Requirement, as Required by the FERC Joint-Access Transmission Tariff		$ 26,000
Capital Addition Requirements by the FERC Joint-Access Transmission Tariff			$ 5,000
Black Hills Wyoming and Wyoming Electric | Federal Energy Regulatory Commission (FERC)
Public Utilities, General Disclosures [Line Items]
Number of Megawatts Capacity Purchased | MW	60
Long-term Purchase Commitment, Period	11 years

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