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COMMITMENTS: Commitments Level 3 (Tables) | 12 Months Ended
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Dec. 31, 2025
Commitments and Contingencies Disclosure [Abstract] |
Schedule of Long-term Contracts for Purchase of Electric Power |
|  | 2026 |  | 2027 |  | 2028 |  | 2029 |  | 2030 |  | Thereafter
Cogeneration, power production, battery storage, and transmission rights |  | $ | 350,046 |  |  | $ | 383,878 |  |  | $ | 427,829 |  |  | $ | 428,270 |  |  | $ | 425,584 |  |  | $ | 3,710,029 |
Fuel |  | 191,035 |  |  | 159,806 |  |  | 96,773 |  |  | 45,314 |  |  | 46,063 |  |  | 498,929 |
Long-term Purchase Commitment | Idaho Power also has the following long-term commitments (in thousands of dollars):
|  | 2026 |  | 2027 |  | 2028 |  | 2029 |  | 2030 |  | Thereafter
Joint-operating agreement payments(1) |  | $ | 2,983 |  |  | $ | 2,983 |  |  | $ | 2,983 |  |  | $ | 2,983 |  |  | $ | 2,983 |  |  | $ | 14,914 |
Easements and other payments(1) |  | 2,322 |  |  | 2,371 |  |  | 2,421 |  |  | 2,472 |  |  | 2,523 |  |  | 13,435 |
Maintenance, service, and materials agreements(1)(2) |  | 479,388 |  |  | 110,347 |  |  | 312,155 |  |  | 36,558 |  |  | 8,327 |  |  | 41,237 |
FERC and other industry-related fees(1) |  | 17,898 |  |  | 17,106 |  |  | 16,962 |  |  | 16,908 |  |  | 17,391 |  |  | 85,255 |
(1) Approximately $30 million, $1 million, $16 million, and $170 million of the commitments included in joint-operating agreement payments, easements and other payments, maintenance, service, and materials agreements, and FERC and other industry-related fees, respectively, have contracts that do not specify terms related to expiration. As these contracts are presumed to continue indefinitely, ten years of information, estimated based on current contract terms, has been included in the table for presentation purposes. (2) As of December 31, 2025, Idaho Power had a remaining $481 million commitment related to contracts to acquire and own transmission and generation resources with in-service dates in 2028 and 2030.

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- Definition Tabular disclosure of key provisions of an arrangement under which the entity has agreed to purchase goods or services over a period of time greater than one year or the normal operating cycle, if longer, including the item for which expenditures will be made, minimum quantities, milestones, time period and committed amount. + References No definition available. + Details
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- Definition Tabular disclosure of information concerning the terms and significance of long term contracts to purchase power (generally referred to as purchase power agreements (PPAs) or power sale agreements (PSAs)) including date of contract expiration, share of plant output being purchased, estimated annual cost, annual minimum debt service payment required and amount of related long-term debt or lease obligations outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.D) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480114/980-10-S99-1 + Details
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