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LONG-TERM DEBT (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Aug. 06, 2026	Jul. 15, 2026	Feb. 27, 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
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount			$ 116,000
Debt Instrument, Interest Rate, Stated Percentage			1.70%
First Mortgage Bonds 5.70 Series O Due 2055 [Domain]
Debt Instrument [Line Items]
Secured Long-term Debt, Noncurrent		$ 200,000
First Mortgage Bonds 5.70 Series O Due 2055 [Domain] \| Medium Term Notes, Series O
Debt Instrument [Line Items]
Secured Long-term Debt, Noncurrent		$ 600,000
Debt Instrument, Interest Rate, Stated Percentage		5.70%
debt instrument, net proceeds plus accrued interest		$ 186,600
Debt instrument interest rate limit		6.133%
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	1,600,000
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	2,400,000
Idaho Power Company \| Public Utilities
Debt Instrument [Line Items]
Indenture, Unused Borrowing Capacity, Amount	$ 1,300,000