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REVENUES: Alternative Revenue Program and Other Revenues (Details) - USD ($) $ in Thousands | 12 Months Ended
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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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- Definition [Line Items] for Alternative Revenue Program and Other Revenues [Table] + References No definition available. + Details
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- Details
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