INCOME TAXES: Supplemental Cash Flow Disclosures (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income Tax Paid, by Individual Jurisdiction [Line Items]
Income Tax Paid, Federal, after Refund Received	$ 18,000	$ 14,000	$ 0
Income Tax Paid, State and Local, after Refund Received	5,600	10,300	5,300
Income Tax Paid, Foreign, after Refund Received	892	900	900
Income taxes	24,492	25,200	6,200
Idaho Power Company
Income Tax Paid, by Individual Jurisdiction [Line Items]
Income Tax Paid, Federal, after Refund Received	18,382	30,615	34,604
Income Tax Paid, State and Local, after Refund Received	7,522	5,598	15,765
Income Tax Paid, Foreign, after Refund Received	841	905	1,446
Income taxes	$ 26,745	$ 37,118	$ 51,815

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Amount, after income tax refund received, of cash paid to federal (national) tax jurisdiction for tax on income.

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Amount, after refund, of cash paid to foreign, federal, state, and local jurisdictions as income tax.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482913/230-10-50-2A

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-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 23
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-23

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-22

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