LONG-TERM DEBT	9 Months Ended
Sep. 30, 2026
Debt Disclosure [Abstract]
LONG-TERM DEBT	LONG-TERM DEBT Long-Term Debt Issuances, Maturities, and Redemptions On February 27, 2026, Idaho Power issued $350 million in aggregate principal amount of 4.85% first mortgage bonds, secured medium-term notes, Series O, maturing on March 1, 2036. On July 15, 2026, Idaho Power repaid $116 million in aggregate principal amount of maturing 1.70% pollution control revenue bonds. On August 6, 2026, Idaho Power issued $200 million in aggregate principal amount of its 5.70% first mortgage bonds, secured medium-term notes, Series O, maturing on March 15, 2055. The bonds were issued at a reoffer yield of 6.133%, which resulted in net proceeds to Idaho Power of $186.6 million plus accrued interest. After this offering the aggregate principal amount of the 5.70% first mortgage bonds is $600 million. Idaho Power First Mortgage Bonds Idaho Power's issuance of long-term indebtedness is subject to the approval of the IPUC, OPUC, and WPSC. In June and July 2026, Idaho Power received orders from the IPUC, OPUC, and WPSC authorizing the company to issue and sell from time to time up to $1.5 billion in aggregate principal amount of debt securities and first mortgage bonds, subject to conditions specified in the orders. Authority from the IPUC is effective through June 30, 2029, subject to extensions upon request to the IPUC. The OPUC's and WPSC's orders do not impose a time limitation for issuances, but the OPUC order does impose a number of other conditions, including a requirement that the interest rates for the debt securities or first mortgage bonds fall within either (a) designated spreads over comparable U.S. Treasury rates or (b) a maximum interest rate limit of 8 percent. At September 30, 2026, $1.3 billion remained available for debt issuance under the regulatory orders. Idaho Power's Indenture of Mortgage and Deed of Trust, dated as of October 1, 1937, as amended and supplemented from time to time (Indenture), limits the amount of additional first mortgage bonds that Idaho Power may issue to the sum of (a) the principal amount of retired first mortgage bonds and (b) 60 percent of total unfunded property additions, as defined in the Indenture. As of September 30, 2026, the maximum amount of additional first mortgage bonds Idaho Power could issue under this test was approximately $2.4 billion. The Indenture also imposes a fixed cap of $5.5 billion on the aggregate amount of first mortgage bonds that may be outstanding under the Indenture, which cap may be amended under certain conditions. As of September 30, 2026, Idaho Power could issue approximately $1.6 billion of additional first mortgage bonds under that aggregate cap.

On August 6, 2026, Idaho Power issued $200 million in aggregate principal amount of its 5.70% first mortgage bonds, secured medium-term notes, Series O, maturing on March 15, 2055. The bonds were issued at a reoffer yield of 6.133%, which resulted in net proceeds to Idaho Power of $186.6 million plus accrued interest. After this offering the aggregate principal amount of the 5.70% first mortgage bonds is $600 million.

Idaho Power's issuance of long-term indebtedness is subject to the approval of the IPUC, OPUC, and WPSC. In June and July 2026, Idaho Power received orders from the IPUC, OPUC, and WPSC authorizing the company to issue and sell from time to time up to $1.5 billion in aggregate principal amount of debt securities and first mortgage bonds, subject to conditions specified in the orders. Authority from the IPUC is effective through June 30, 2029, subject to extensions upon request to the IPUC. The OPUC's and WPSC's orders do not impose a time limitation for issuances, but the OPUC order does impose a number of other conditions, including a requirement that the interest rates for the debt securities or first mortgage bonds fall within either (a) designated spreads over comparable U.S. Treasury rates or (b) a maximum interest rate limit of 8 percent. At September 30, 2026, $1.3 billion remained available for debt issuance under the regulatory orders.

Idaho Power's Indenture of Mortgage and Deed of Trust, dated as of October 1, 1937, as amended and supplemented from time to time (Indenture), limits the amount of additional first mortgage bonds that Idaho Power may issue to the sum of (a) the principal amount of retired first mortgage bonds and (b) 60 percent of total unfunded property additions, as defined in the Indenture. As of September 30, 2026, the maximum amount of additional first mortgage bonds Idaho Power could issue under this test was approximately $2.4 billion. The Indenture also imposes a fixed cap of $5.5 billion on the aggregate amount of first mortgage bonds that may be outstanding under the Indenture, which cap may be amended under certain conditions. As of September 30, 2026, Idaho Power could issue approximately $1.6 billion of additional first mortgage bonds under that aggregate cap.