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Financing: Long-Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Aug. 26, 2021	Dec. 31, 2020	Jun. 17, 2020
Debt Instrument [Line Items]
Total long-term debt	$ 4,153,801		$ 3,561,345
Less current maturities	0		8,436
Less unamortized deferred financing costs	26,878		24,809
Long-term debt, net of current maturities	4,126,923		3,528,100
Revolving Credit Facility
Debt Instrument [Line Items]
Less unamortized deferred financing costs	2,500		1,000
Senior Unsecured Notes Due 2024
Debt Instrument [Line Items]
Stated interest rate (percent)		1.037%
Less unamortized deferred financing costs		$ 3,700
Corporate, Non-Segment | Senior Unsecured Notes Due 2030
Debt Instrument [Line Items]
Stated interest rate (percent)				2.50%
Black Hills Corporation | Corporate, Non-Segment
Debt Instrument [Line Items]
Long-term debt	3,625,000		3,026,436
Less unamortized debt discount	(6,125)		(7,013)
Total long-term debt	$ 3,618,875		3,019,423
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		0
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 Corporation | Corporate, Non-Segment | Corporate Term Loan Due June 2021
Debt Instrument [Line Items]
Long-term debt	0		1,436
Black Hills Energy - South Dakota Electric | Electric Utilities
Debt Instrument [Line Items]
Long-term debt	340,000		340,000
Less unamortized debt discount	(74)		(78)
Total long-term debt	$ 339,926		339,922
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		202,000
Less unamortized debt discount	0		0
Total long-term debt	$ 195,000		202,000
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 2021
Debt Instrument [Line Items]
Long-term debt	$ 0		7,000
Wyoming Electric | Electric Utilities | Industrial Development Revenue Bonds Due 2027
Debt Instrument [Line Items]
Variable interest rate (percent)	0.15%
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

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