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INVESTMENTS: Investments Level 4 (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Summary of investments in debt and equity securities
Equity method investment	$ 9,529	$ 9,666
Investments in affordable housing	50,422	54,654
Other Investments	5,948	4,099
Total investments	155,002	161,340
Earnings of unconsolidated equity-method investments	4,922	4,539	$ 12,426
Debt Securities, Held-to-Maturity, Purchase	$ (2,896)	(1,845)	(1,617)
Idaho Power Company
Summary of investments in debt and equity securities
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage	33.00%
Corporate Fixed-Income And Asset-Backed Debt Securities
Summary of investments in debt and equity securities
Debt Securities, Held-to-Maturity, Purchase	$ 2,900	1,800
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value	1,400	2,700
Idaho Power Company
Summary of investments in debt and equity securities
Equity method investment	16,833	20,998
Cash, Cash Equivalents, and Short-term Investments	37,232	38,873
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	33,822	32,151
Executive Deferred Compensation Plan Assets	1,216	899
Total investments	$ 89,103	92,921
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage	33.00%
Earnings of unconsolidated equity-method investments	$ 2,984	2,671	10,540
Gross realized gains from sales	0	0	0
Debt Securities, Held-to-Maturity, Purchase	(2,896)	(1,845)	(1,617)
Bridger Coal Company
Summary of investments in debt and equity securities
Earnings of unconsolidated equity-method investments	$ 2,984	2,671	10,540
Ida-West Energy
Summary of investments in debt and equity securities
Jointly Owned Utility Plant, Proportionate Ownership Share	50.00%
Earnings of unconsolidated equity-method investments	$ 1,938	$ 1,868	$ 1,886

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