Financing: Long-Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Aug. 26, 2021	Jun. 17, 2020
Debt Instrument [Line Items]
Total long-term debt	$ 4,154,672	$ 4,153,801
Less current maturities	525,000	0
Less unamortized deferred financing costs	22,332	26,878
Long-term debt, net of current maturities	3,607,340	4,126,923
Revolving Credit Facility
Debt Instrument [Line Items]
Less unamortized deferred financing costs	1,800	2,500
Senior Unsecured Notes Due 2024
Debt Instrument [Line Items]
Stated interest rate (percent)			1.037%	2.50%
Less unamortized deferred financing costs			$ 3,700
Black Hills Corporation | Corporate, Non-Segment
Debt Instrument [Line Items]
Long-term debt		3,625,000
Less unamortized debt discount	(5,259)	(6,125)
Total long-term debt	$ 3,619,741	3,618,875
Black Hills Corporation | Corporate, Non-Segment | Senior Unsecured Notes Due 2023
Debt Instrument [Line Items]
Stated interest rate (percent)	4.25%
Long-term debt	$ 525,000	525,000
Black Hills Corporation | Corporate, Non-Segment | Senior Unsecured Notes Due 2024
Debt Instrument [Line Items]
Stated interest rate (percent)	1.04%
Long-term debt	$ 600,000	600,000
Black Hills Corporation | Corporate, Non-Segment | Senior Unsecured Notes Due 2026
Debt Instrument [Line Items]
Stated interest rate (percent)	3.95%
Long-term debt	$ 300,000	300,000
Black Hills Corporation | Corporate, Non-Segment | Senior Unsecured Notes Due 2027
Debt Instrument [Line Items]
Stated interest rate (percent)	3.15%
Long-term debt	$ 400,000	400,000
Black Hills Corporation | Corporate, Non-Segment | Senior Unsecured Notes Due 2029
Debt Instrument [Line Items]
Stated interest rate (percent)	3.05%
Long-term debt	$ 400,000	400,000
Black Hills Corporation | Corporate, Non-Segment | Senior Unsecured Notes Due 2030
Debt Instrument [Line Items]
Stated interest rate (percent)	2.50%
Long-term debt	$ 400,000	400,000
Black Hills Corporation | Corporate, Non-Segment | Senior Unsecured Notes Due 2033
Debt Instrument [Line Items]
Stated interest rate (percent)	4.35%
Long-term debt	$ 400,000	400,000
Black Hills Corporation | Corporate, Non-Segment | Senior Unsecured Notes Due 2046
Debt Instrument [Line Items]
Stated interest rate (percent)	4.20%
Long-term debt	$ 300,000	300,000
Black Hills Corporation | Corporate, Non-Segment | Senior Unsecured Notes Due 2049
Debt Instrument [Line Items]
Stated interest rate (percent)	3.88%
Long-term debt	$ 300,000	300,000
Black Hills Energy - South Dakota Electric | Electric Utilities
Debt Instrument [Line Items]
Long-term debt	340,000	340,000
Less unamortized debt discount	(69)	(74)
Total long-term debt	$ 339,931	339,926
Black Hills Energy - South Dakota Electric | Electric Utilities | First Mortgage Bonds Due 2032
Debt Instrument [Line Items]
Stated interest rate (percent)	7.23%
Long-term debt	$ 75,000	75,000
Black Hills Energy - South Dakota Electric | Electric Utilities | First Mortgage Bonds Due 2039
Debt Instrument [Line Items]
Stated interest rate (percent)	6.13%
Long-term debt	$ 180,000	180,000
Black Hills Energy - South Dakota Electric | Electric Utilities | First Mortgage Bonds Due 2044
Debt Instrument [Line Items]
Stated interest rate (percent)	4.43%
Long-term debt	$ 85,000	85,000
Wyoming Electric | Electric Utilities
Debt Instrument [Line Items]
Long-term debt	195,000	195,000
Total long-term debt	195,000	195,000
Wyoming Electric | Electric Utilities | Senior Unsecured Notes Due 2027
Debt Instrument [Line Items]
Long-term debt	$ 10,000
Wyoming Electric | Electric Utilities | First Mortgage Bonds Due 2044
Debt Instrument [Line Items]
Stated interest rate (percent)	4.53%
Long-term debt	$ 75,000	75,000
Wyoming Electric | Electric Utilities | Industrial Development Revenue Bonds Due 2027
Debt Instrument [Line Items]
Variable interest rate (percent)	3.68%
Long-term debt	$ 10,000	10,000
Wyoming Electric | Electric Utilities | First Mortgage Bonds Due 2037
Debt Instrument [Line Items]
Stated interest rate (percent)	6.67%
Long-term debt	$ 110,000	$ 110,000