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Long-Term Debt | 12 Months Ended
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Dec. 31, 2025
Debt Disclosure [Abstract] |
Long-term Debt | The following table summarizes IDACORP's and Idaho Power's long-term debt at December 31 (in thousands of dollars):
|  | 2025 |  | 2024
First mortgage bonds: |  |  |  |
1.90% Series due 2030 |  | $ | 80,000 |  |  | $ | 80,000 |
6.00% Series due 2032 |  | 100,000 |  |  | 100,000 |
4.99% Series due 2032 |  | 23,000 |  |  | 23,000 |
5.50% Series due 2033 |  | 70,000 |  |  | 70,000 |
5.50% Series due 2034 |  | 50,000 |  |  | 50,000 |
5.875% Series due 2034 |  | 55,000 |  |  | 55,000 |
5.20% Series due 2034 |  | 300,000 |  |  | 300,000 |
5.30% Series due 2035 |  | 60,000 |  |  | 60,000 |
6.30% Series due 2037 |  | 140,000 |  |  | 140,000 |
6.25% Series due 2037 |  | 100,000 |  |  | 100,000 |
4.85% Series due 2040 |  | 100,000 |  |  | 100,000 |
4.30% Series due 2042 |  | 75,000 |  |  | 75,000 |
5.06% Series due 2042 |  | 25,000 |  |  | 25,000 |
5.06% Series due 2043 |  | 60,000 |  |  | 60,000 |
4.00% Series due 2043 |  | 75,000 |  |  | 75,000 |
3.65% Series due 2045 |  | 250,000 |  |  | 250,000 |
4.05% Series due 2046 |  | 120,000 |  |  | 120,000 |
4.20% Series due 2048 |  | 450,000 |  |  | 450,000 |
5.20% Series due 2053 |  | 62,000 |  |  | 62,000 |
5.50% Series due 2053 |  | 400,000 |  |  | 400,000 |
5.80% Series due 2054 |  | 350,000 |  |  | 350,000 |
5.70% Series due 2055 |  | 400,000 |  |  | — |
Total first mortgage bonds |  | 3,345,000 |  |  | 2,945,000 |
Pollution control revenue bonds: |  |  |  |
1.70% Series due 2026(1) |  | 116,300 |  |  | 116,300 |
Total pollution control revenue bonds |  | 116,300 |  |  | 116,300 |
American Falls Variable Rate bond guarantee due 2025 |  | — |  |  | 19,885 |
Unamortized premium/discount and issuance costs |  | (13,962) |  |  | (7,523) |
Total IDACORP and Idaho Power outstanding debt(2) |  | 3,447,338 |  |  | 3,073,662 |
Current maturities of long-term debt |  | (116,300) |  |  | (19,885) |
Total long-term debt |  | $ | 3,331,038 |  |  | $ | 3,053,777 |
(1) Sweetwater County Pollution Control Revenue Bonds are secured by the first mortgage bonds, bringing the total first mortgage bonds outstanding at December 31, 2025, to $3.461 billion. (2) At December 31, 2025 and 2024, the overall effective cost rate of Idaho Power's outstanding debt was 5.13 percent and 5.03 percent, respectively. At December 31, 2025, the maturities for the aggregate amount of IDACORP and Idaho Power long-term debt outstanding were as follows (in thousands of dollars):
| 2026 |  | 2027 |  | 2028 |  | 2029 |  | 2030 |  | Thereafter
| $ | 116,300 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 80,000 |  |  | $ | 3,265,000 |
Long-Term Debt Issuances, Maturities, and Redemptions On March 13, 2025, Idaho Power issued $400 million in aggregate principal amount of 5.70% first mortgage bonds, secured medium-term notes, Series O, maturing on March 15, 2055. On February 3, 2025, Idaho Power repaid $19.9 million in aggregate principal amount of maturing variable rate American Falls Bonds. On December 2, 2024, Idaho Power repaid $49.8 million in aggregate principal amount of maturing 1.45% Humboldt County Pollution Control Revenue Bonds. On August 12, 2024, Idaho Power issued $300 million in aggregate principal amount of 5.20% first mortgage bonds, secured medium-term notes, Series M, maturing on August 15, 2034. 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 February and March 2024, Idaho Power received orders from the IPUC, OPUC, and WPSC authorizing the company to issue and sell from time to time up to $1.2 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 December 31, 2026, 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 December 31, 2025, $500 million remained available for debt issuance under the regulatory orders. In February 2025, Idaho Power filed a shelf registration statement with the SEC, which became effective upon filing, for the offer and sale of an unspecified principal amount of its first mortgage bonds. The issuance of first mortgage bonds requires that Idaho Power meet interest coverage and security provisions set forth in 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). Future issuances of first mortgage bonds are subject to satisfaction of covenants and security provisions set forth in the Indenture, market conditions, regulatory authorizations, and covenants contained in other financing agreements. In February 2025, Idaho Power entered into a selling agency agreement with seven banks named in the agreement in connection with the potential issuance and sale from time to time of up to $2.1 billion aggregate principal amount of first mortgage bonds, secured medium-term notes, Series O (Series O Notes), under the Indenture. Also in February 2025, Idaho Power entered into the Fifty-third Supplemental Indenture, dated effective as of February 26, 2025, to the Indenture (Fifty-third Supplemental Indenture). The Fifty-third Supplemental Indenture provides for, among other items, the issuance of up to $2.1 billion in aggregate principal amount of Series O Notes pursuant to the Indenture and increased the limit of the amount of first mortgage bonds at any one time outstanding to $5.5 billion as provided in the Indenture. The amount issuable is also restricted by property, earnings, and other provisions of the Indenture and supplemental indentures to the Indenture. The Indenture requires that Idaho Power's net earnings be at least twice the annual interest requirements on all outstanding debt of equal or prior rank, including the bonds that Idaho Power may propose to issue. Under certain circumstances, the net earnings test does not apply, including the issuance of refunding bonds to retire outstanding bonds that mature in less than two years or that are of an equal or higher interest rate, or prior lien bonds. The mortgage of the Indenture secures all bonds issued under the Indenture equally and ratably, without preference, priority, or distinction. First mortgage bonds issued in the future will also be secured by the mortgage of the Indenture. The lien constitutes a first mortgage on all the properties of Idaho Power, subject only to certain limited exceptions including liens for taxes and assessments that are not delinquent and minor excepted encumbrances. Certain of the properties of Idaho Power are subject to easements, leases, contracts, covenants, workmen's compensation awards, and similar encumbrances and minor defects common to properties. The mortgage of the Indenture does not create a lien on revenues or profits, or notes or accounts receivable, contracts or choses in action, except as permitted by law during a completed default, securities, or cash, except when pledged, or merchandise or equipment manufactured or acquired for resale. The mortgage of the Indenture creates a lien on the interest of Idaho Power in property subsequently acquired, other than excepted property, subject to limitations in the case of consolidation, merger, or sale of all or substantially all of the assets of Idaho Power. The Indenture requires Idaho Power to spend or appropriate 15 percent of its annual gross operating revenues for maintenance, retirement, or amortization of its properties. Idaho Power may, however, anticipate or make up these expenditures or appropriations within the 5 years that immediately follow or precede a particular year. The 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 December 31, 2025, the maximum amount of additional first mortgage bonds Idaho Power could issue under this test was approximately $2.3 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 December 31, 2025, Idaho Power could issue approximately $2.0 billion of additional first mortgage bonds based on that aggregate cap.

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