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Regulatory Matters: Tax Cut and Jobs Act (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Apr. 30, 2021
Dec. 31, 2021
Jan. 01, 2022
Jan. 26, 2021
Dec. 30, 2020
Public Utilities, General Disclosures [Line Items]          
Benefit from Relieved TCJA Related Liabilities   $ 4,000      
Colorado Public Utilities Commission (CPUC) | Black Hills Energy - Colorado Electric          
Public Utilities, General Disclosures [Line Items]          
Settlement of plan to provide TCJA-related customer billing credits to its customers         $ 9,300
Annual TCJA-Related Customer Billing Credits $ 900        
Nebraska Public Service Commission (NPSC) | Black Hills Energy - Nebraska Gas          
Public Utilities, General Disclosures [Line Items]          
Settlement of plan to provide TCJA-related customer billing credits to its customers       $ 2,900  
Kansas Corporation Commission (KCC) | Black Hills Energy, Kansas Gas | Subsequent Event          
Public Utilities, General Disclosures [Line Items]          
Settlement of Plan to Provide TCJA and State Tax Reform benefits to Customers Annually     $ 3,000    
Settlement Total of Plan to Provide TCJA and State Tax Reform benefits to Customers     $ 9,100