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INCOME TAXES: Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Deferred tax assets: |  |
Regulatory liabilities | $ 121,489 | $ 127,634
Deferred compensation | 24,483 | 24,782
Deferred revenue | 70,326 | 64,592
Tax credits | 70,854 | 66,783
Partnership investments | 24,157 | 18,450
Retirement benefits | 19,533 | 26,495
Other | 37,884 | 24,869
Total | 368,726 | 353,605
Deferred tax liabilities: |  |
Property, plant and equipment | 235,849 | 243,454
Regulatory assets | 821,346 | 811,054
Partnership investments | 4,309 | 4,613
Retirement benefits | 65,214 | 75,716
Deferred Tax Liabilities, Regulatory Assets | 22,252 | 16,272
Other | 22,641 | 24,727
Total | 1,171,611 | 1,175,836
Net deferred tax liabilities | 802,885 | 822,231
Idaho Power Company |  |
Deferred tax assets: |  |
Regulatory liabilities | 121,489 | 127,634
Deferred compensation | 24,483 | 24,782
Deferred revenue | 70,326 | 64,592
Tax credits | 67,930 | 53,859
Partnership investments | 24,157 | 18,450
Retirement benefits | 19,533 | 26,495
Other | 37,831 | 24,826
Total | 365,749 | 340,638
Deferred tax liabilities: |  |
Property, plant and equipment | 235,849 | 243,454
Regulatory assets | 821,346 | 811,054
Partnership investments | 0 | 0
Retirement benefits | 65,214 | 75,716
Deferred Tax Liabilities, Regulatory Assets | 22,252 | 16,272
Other | 22,027 | 23,588
Total | 1,166,688 | 1,170,084
Net deferred tax liabilities | $ 800,939 | $ 829,446

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- Definition The amount as of the balance sheet date of the estimated future tax effects attributable to the difference between the tax basis of pension liabilities funded in advance and the basis of a prepaid pension asset determined in accordance with generally accepted accounting principles. The difference in basis of such costs will increase future taxable income when such basis difference reverses. Prepaid pension costs represented the cumulative employer's contributions in excess of net pension cost recognized, before the adoption of the recognition provisions of FAS 158. Under FAS 158, prepaid pension costs are no longer recognized in the statement of financial position. + References No definition available. + Details
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