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INCOME TAXES: Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Deferred tax assets: |  |
Regulatory liabilities | $ 108,641 | $ 94,946
Deferred compensation | 24,288 | 24,495
Deferred revenue | 58,860 | 53,418
Tax credits | 52,010 | 44,727
Partnership investments | 12,652 | 15,259
Retirement benefits | 44,803 | 38,687
Other | 26,537 | 19,657
Total | 327,791 | 291,189
Deferred tax liabilities: |  |
Property, plant and equipment | 266,992 | 249,452
Regulatory assets | 774,672 | 739,689
Deferred Tax Liabilities, Regulatory Assets | 29,742 | 33,116
Partnership investments | 3,593 | 3,355
Retirement benefits | 94,231 | 80,777
Other | 41,285 | 58,716
Total | 1,210,515 | 1,165,105
Net deferred tax liabilities | 882,724 | 873,916
Idaho Power Company |  |
Deferred tax assets: |  |
Regulatory liabilities | 108,641 | 94,946
Deferred compensation | 24,288 | 24,495
Deferred revenue | 58,860 | 53,418
Tax credits | 49,734 | 44,727
Partnership investments | 12,652 | 15,259
Retirement benefits | 44,803 | 38,687
Other | 26,416 | 19,526
Total | 325,394 | 291,058
Deferred tax liabilities: |  |
Property, plant and equipment | 266,992 | 249,452
Regulatory assets | 774,672 | 739,689
Deferred Tax Liabilities, Regulatory Assets | 29,742 | 33,116
Partnership investments | 0 | 0
Retirement benefits | 94,231 | 80,777
Other | 40,807 | 58,716
Total | 1,206,444 | 1,161,750
Net deferred tax liabilities | $ 881,050 | $ 870,692

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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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