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LONG-TERM DEBT (Details) - USD ($) $ in Thousands	Jul. 21, 2026	Jul. 15, 2026	Jun. 30, 2026	Feb. 17, 2026
First Mortgage Bonds 4.85 Series O Due 2036 [Domain]
Debt Instrument [Line Items]
Secured Long-term Debt, Noncurrent				$ 350,000
Debt Instrument, Interest Rate, Stated Percentage				4.85%
Pollution Control Bond 1.70 Due 2026 \| Subsequent Event
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount		$ 116,000
Debt Instrument, Interest Rate, Stated Percentage		1.70%
Idaho Power Company
Debt Instrument [Line Items]
Debt instrument interest rate limit			8.00%
Indenture, Limit of first mortgate bonds at any one time outstanding			$ 5,500,000
Debt Instrument, Unused Borrowing Capacity, Amount			1,700,000
Principal amount of debt securities and first mortgage bonds authorized by the IPUC, OPUC, and WPSC.			1,500,000
Idaho Power Company \| Principal amount of debt securities in Selling Agreement
Debt Instrument [Line Items]
Indenture, Unused Borrowing Capacity, Amount			2,300,000
Idaho Power Company \| Public Utility Commissions -Wyoming
Debt Instrument [Line Items]
Indenture, Unused Borrowing Capacity, Amount			$ 150,000
Idaho Power Company \| Public Utility Commissions -Wyoming \| Subsequent Event
Debt Instrument [Line Items]
Principal amount of debt securities and first mortgage bonds authorized by the IPUC, OPUC, and WPSC.	$ 1,500,000