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OTHER INCOME AND EXPENSE Other Income and Expense Level 4 (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Schedule of other nonoperating income (expense) [Line Items] |  |  |
Interest and dividend income, net | $ 23,872 | $ 22,577 | $ 15,266
Carrying charges on regulatory assets | 19,323 | 21,908 | 13,099
Net periodic benefit cost | 5,986 | 8,077 | 6,513
Income from life insurance investments | 13,244 | 10,186 | 8,384
Other Income | 6,769 | 8,659 | 6,286
Other (income) expense, net | 57,222 | 55,253 | 36,522
Idaho Power Company |  |  |
Schedule of other nonoperating income (expense) [Line Items] |  |  |
Interest and dividend income, net | 16,014 | 16,731 | 13,410
Carrying charges on regulatory assets | 19,323 | 21,908 | 13,099
Net periodic benefit cost | 5,986 | 8,077 | 6,513
Income from life insurance investments | 13,244 | 10,186 | 8,384
Other Income | 6,953 | 8,962 | 6,333
Other (income) expense, net | $ 49,548 | $ 49,710 | $ 34,713

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