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COMMITMENTS: Commitments Level 4 (Details) | 12 Months Ended |
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Dec. 31, 2023 USD ($) MWh | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2026 MWh
Long-term Purchase Commitment |  |  |  |  |
Purchased power |  | $ 501,531,000 | $ 544,345,000 | $ 393,691,000 |
Bridger Coal Company |  |  |  |  |
Long-term Purchase Commitment |  |  |  |  |
IERCo guarantee of BCC reclamation obligation |  | 142,900,000 |  |  |
Distributions from Reclamation Trust Fund |  | 6,000,000 |  |  |
Guarantor Obligations Total Reclamation Trust Fund |  | $ 253,300,000 |  |  |
Idaho Power Company |  |  |  |  |
Long-term Purchase Commitment |  |  |  |  |
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage |  | 33.00% |  |  |
IERCo guarantee of BCC reclamation obligation |  | $ 47,600,000 |  |  |
Purchased power |  | $ 501,531,000 | 544,345,000 | 393,691,000 |
Idaho Power Company | PURPA and Non-PURPA Online |  |  |  |  |
Long-term Purchase Commitment |  |  |  |  |
Nameplate Capacity (in MW) | MWh |  | 1,432 |  |  |
Idaho Power Company | Jointly Owned Electricity Transmission and Distribution System |  |  |  |  |
Long-term Purchase Commitment |  |  |  |  |
Interest in Boardman-to-Hemmingway transmission project |  | 45.00% |  |  |
Security Deposit Received, B2H Transmission Project |  | $ 10,000,000 |  |  |
Construction in Progress, Permitting Interest Acquired |  | 31,400,000 |  |  |
Cash and Cash Equivalents, Security Deposit |  | 10,000,000 |  |  |
Other Noncurrent Liabilities, Security Deposit and Permitting Interest |  | $ 41,400,000 |  |  |
BPA permitting interest payment to be made over time period |  | 15 years |  |  |
BPA security deposit to begin after years of energization |  | 10 years |  |  |
Interest in Boardman-to-Hemmingway transmission project acquired from Bonneville Power Administration |  | 24.00% |  |  |
Idaho Power Company | Joint-operating agreement payment [Member] |  |  |  |  |
Long-term Purchase Commitment |  |  |  |  |
Purchase Obligation Estimated Due Current | [1] | $ 2,834,000 |  |  |
Purchase Obligation Estimated Future Payments Due In Two Years | [1] | 2,834,000 |  |  |
Purchase Obligation Estimated Future Payments Due In Three Years | [1] | 2,834,000 |  |  |
Purchase Obligation Estimated Future Payments Due In Four Years | [1] | 2,834,000 |  |  |
Purchase Obligation Estimated Future Payments Due In Five Years | [1] | 2,834,000 |  |  |
Purchase Obligation Estimated Future Payments Due In Six Years And Thereafter | [1] | 14,172,000 |  |  |
Idaho Power Company | Easements and Other payments [Member] |  |  |  |  |
Long-term Purchase Commitment |  |  |  |  |
Purchase Obligation Estimated Due Current | [1] | 2,119,000 |  |  |
Purchase Obligation Estimated Future Payments Due In Two Years | [1] | 2,163,000 |  |  |
Purchase Obligation Estimated Future Payments Due In Three Years | [1] | 2,209,000 |  |  |
Purchase Obligation Estimated Future Payments Due In Four Years | [1] | 2,255,000 |  |  |
Purchase Obligation Estimated Future Payments Due In Five Years | [1] | 2,302,000 |  |  |
Purchase Obligation Estimated Future Payments Due In Six Years And Thereafter | [1] | 12,258,000 |  |  |
Idaho Power Company | Other operations and maintenance |  |  |  |  |
Long-term Purchase Commitment |  |  |  |  |
Purchase Obligation Estimated Due Current | [1],[2] | 321,776,000 |  |  |
Purchase Obligation Estimated Future Payments Due In Two Years | [1],[2] | 29,042,000 |  |  |
Purchase Obligation Estimated Future Payments Due In Three Years | [1] | 11,273,000 |  |  |
Purchase Obligation Estimated Future Payments Due In Four Years | [1] | 13,386,000 |  |  |
Purchase Obligation Estimated Future Payments Due In Five Years | [1] | 3,450,000 |  |  |
Purchase Obligation Estimated Future Payments Due In Six Years And Thereafter | [1] | 41,118,000 |  |  |
Idaho Power Company | FERC and other industry-related fees |  |  |  |  |
Long-term Purchase Commitment |  |  |  |  |
Purchase Obligation Estimated Due Current | [1] | 18,514,000 |  |  |
Purchase Obligation Estimated Future Payments Due In Two Years | [1] | 17,020,000 |  |  |
Purchase Obligation Estimated Future Payments Due In Three Years | [1] | 16,830,000 |  |  |
Purchase Obligation Estimated Future Payments Due In Four Years | [1] | 16,780,000 |  |  |
Purchase Obligation Estimated Future Payments Due In Five Years | [1] | 15,949,000 |  |  |
Purchase Obligation Estimated Future Payments Due In Six Years And Thereafter | [1] | 83,032,000 |  |  |
Idaho Power Company | Cogeneration and power production |  |  |  |  |
Long-term Purchase Commitment |  |  |  |  |
Purchase Obligation Estimated Due Current | [3] | 324,738,000 |  |  |
Purchase Obligation Estimated Future Payments Due In Two Years | [3] | 336,702,000 |  |  |
Purchase Obligation Estimated Future Payments Due In Three Years | [3] | 358,113,000 |  |  |
Purchase Obligation Estimated Future Payments Due In Four Years | [3] | 371,980,000 |  |  |
Purchase Obligation Estimated Future Payments Due In Five Years | [3] | 345,740,000 |  |  |
Purchase Obligation Estimated Future Payments Due In Six Years And Thereafter | [3] | 2,999,760,000 |  |  |
Idaho Power Company | Fuel purchase commitments |  |  |  |  |
Long-term Purchase Commitment |  |  |  |  |
Purchase Obligation Estimated Due Current |  | 155,474,000 |  |  |
Purchase Obligation Estimated Future Payments Due In Two Years |  | 25,672,000 |  |  |
Purchase Obligation Estimated Future Payments Due In Three Years |  | 15,271,000 |  |  |
Purchase Obligation Estimated Future Payments Due In Four Years |  | 15,439,000 |  |  |
Purchase Obligation Estimated Future Payments Due In Five Years |  | 15,507,000 |  |  |
Purchase Obligation Estimated Future Payments Due In Six Years And Thereafter |  | $ 84,004,000 |  |  |
Idaho Power Company | Cogeneration And Power Production Purchase Commitment Member | Maximum |  |  |  |  |
Long-term Purchase Commitment |  |  |  |  |
Long-term Purchase Commitment, Period |  | 35 years |  |  |
Idaho Power Company | Cogeneration And Power Production Purchase Commitment Member | Minimum |  |  |  |  |
Long-term Purchase Commitment |  |  |  |  |
Long-term Purchase Commitment, Period |  | 1 year |  |  |
Idaho Power Company | Contracts To Acquire And Own Battery Storage Assets Commitment |  |  |  |  |
Long-term Purchase Commitment |  |  |  |  |
Purchase Obligation |  | $ 115,000,000 |  |  |
Idaho Power Company | Contracts To Purchase Battery Storage Capacity Commitment |  |  |  |  |
Long-term Purchase Commitment |  |  |  |  |
Nameplate Capacity (in MW) | MWh |  | 150 |  |  |
Purchase Obligation |  | $ 431,000,000 |  |  |
Idaho Power Company | Long-Term Power Production Purchase Commitment |  |  |  |  |
Long-term Purchase Commitment |  |  |  |  |
Purchased power |  | 258,000,000 | $ 238,000,000 | $ 251,000,000 |
IDACORP [Member] |  |  |  |  |
Long-term Purchase Commitment |  |  |  |  |
Long-term Purchase Commitment, Amount |  | 5,900,000 |  |  |
IDACORP [Member] | Affordable housing limited partnership and other real estate tax credit investments |  |  |  |  |
Long-term Purchase Commitment |  |  |  |  |
Long-term Purchase Commitment, Amount |  | 34,700,000 |  |  |
Forecast | Idaho Power Company | PURPA and Non-PURPA Online |  |  |  |  |
Long-term Purchase Commitment |  |  |  |  |
Nameplate Capacity (in MW) | MWh |  |  |  |  | 428
Contracts with no expiration [Member] | Idaho Power Company | Joint-operating agreement payment [Member] |  |  |  |  |
Long-term Purchase Commitment |  |  |  |  |
Purchase Obligation |  | 28,000,000 |  |  |
Contracts with no expiration [Member] | Idaho Power Company | Easements and Other payments [Member] |  |  |  |  |
Long-term Purchase Commitment |  |  |  |  |
Purchase Obligation |  | 1,000,000 |  |  |
Contracts with no expiration [Member] | Idaho Power Company | Other operations and maintenance |  |  |  |  |
Long-term Purchase Commitment |  |  |  |  |
Purchase Obligation |  | 20,000,000 |  |  |
Contracts with no expiration [Member] | Idaho Power Company | FERC and other industry-related fees |  |  |  |  |
Long-term Purchase Commitment |  |  |  |  |
Purchase Obligation |  | $ 166,000,000 |  |  |
[1] | Approximately $28 million, $1 million, $20 million, and $166 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, 2023, Idaho Power had a remaining $115 million commitment related to four contracts to acquire and own battery storage assets with in-service dates through 2025.
[3] | As of December 31, 2023, Idaho Power had a $431 million commitment related to an agreement to utilize the storage capacity of a 150 MW battery storage facility, over a 20-year term, scheduled to be online in June 2025.

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