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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: Summary of Significant Accounting Policies Level 4 (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Significant Accounting Policies |  |  |
Maturity period of short-term investments | 90 days |  |
Impairment of Receivables | $ 0 | $ 0 |
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service | 3.20% | 3.10% | 2.90%
Impairment of Long-Lived Assets Held-for-use | $ 0 | $ 0 | $ 0
Public Utilities, Allowance for Funds Used During Construction, Rate | 7.20% | 7.20% | 7.40%
Period of Time After Which Unpaid Accounts Are Deemed Late | 30 days |  |
Utility plant in service - net | $ 5,649,641 | $ 5,243,057 |
Investments | $ 155,002 | $ 161,340 |
IDAHO |  |  |
Significant Accounting Policies |  |  |
Late Payment Fee Customer Billings | 1.00% |  |
OREGON |  |  |
Significant Accounting Policies |  |  |
Late Payment Fee Customer Billings | 2.40% |  |
Marysville Hydro Partners |  |  |
Significant Accounting Policies |  |  |
Variable Interest Entity Ownership Percentage of Partner | 50.00% |  |
Utility plant in service - net | $ 14,200 |  |
Ida-West Energy |  |  |
Significant Accounting Policies |  |  |
Jointly Owned Utility Plant, Proportionate Ownership Share | 50.00% |  |
Bridger Coal Company |  |  |
Significant Accounting Policies |  |  |
IERCo guarantee of BCC reclamation obligation | $ 150,200 |  |
Investments | 16,800 |  |
Idaho Power Company |  |  |
Significant Accounting Policies |  |  |
IERCo guarantee of BCC reclamation obligation | $ 50,100 |  |
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service | 3.18% | 3.06% |
Utility plant in service - net | $ 5,649,641 | $ 5,243,057 |
Investments | $ 89,103 | $ 92,921 |
IDACORP Financial Services Limited Partnership Interests |  |  |
Significant Accounting Policies |  |  |
Variable interest entities ownership percentage minimum | 7.00% |  |
Variable interest entities ownership percentage maximum | 100.00% |  |
IDACORP Financial Services Limited Partnership Interests | Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Significant Accounting Policies |  |  |
Net Assets | $ 50,400 |  |

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