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REVENUES: Alternative Revenue Program and Other Revenues (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Alternative Revenue Program and Other Revenues [Line Items]
Regulated Operating Revenue (Expense), Other, Net	$ 62,637	$ 54,084	$ 123,282
Idaho Fixed Cost Adjustment [Member]
Alternative Revenue Program and Other Revenues [Line Items]
Regulated Operating Revenue (Expense), Other, Net	3,896	(2,856)	38,571
Derivative revenues
Alternative Revenue Program and Other Revenues [Line Items]
Regulated Operating Revenue (Expense), Other, Net	$ 58,741	$ 56,940	$ 84,711

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[Line Items] for Alternative Revenue Program and Other Revenues [Table]

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Regulated Operating Revenue (Expense), Other, Net

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