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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Significant Accounting Policies |  |  |
Payments for (Proceeds from) Other Investing Activities | $ (2,153) | $ (4,875) | $ (2,037)
Other assets, noncurrent | 53,810 | 59,427 |
Investments | 163,971 | 121,352 |
Utility plant in service - net | $ 4,733,788 | 4,363,188 |
Maturity period of short-term investments | 90 days |  |
Late Payment Fee Customer Billings | 1.00% |  |
Impairment of Receivables | $ 0 | $ 0 |
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service | 2.90% | 2.70% | 2.90%
Impairment of Long-Lived Assets Held-for-use | $ 0 | $ 0 | $ 0
Public Utilities, Allowance for Funds Used During Construction, Rate | 7.40% | 7.40% | 7.50%
Other Nonoperating Income (Expense) | $ 36,522 | $ 10,805 | $ (3,141)
Other electric utility operating expenses | 38,550 | 37,325 | 34,673
Other property, net of accumulated depreciation | $ 16,429 | 16,946 |
Period of Time After Which Unpaid Accounts Are Deemed Late | 30 days |  |
Marysville Hydro Partners |  |  |
Significant Accounting Policies |  |  |
Variable Interest Entity Ownership Percentage of Partner | 50.00% |  |
Utility plant in service - net | $ 14,900 |  |
Ida-West Energy |  |  |
Significant Accounting Policies |  |  |
Jointly Owned Utility Plant, Proportionate Ownership Share | 50.00% |  |
Bridger Coal Company |  |  |
Significant Accounting Policies |  |  |
Investments | $ 24,100 |  |
IERCo guarantee of BCC reclamation obligation | 142,900 |  |
Idaho Power Company |  |  |
Significant Accounting Policies |  |  |
Payments for (Proceeds from) Other Investing Activities | (6,198) | (7,605) | (2,231)
Other assets, noncurrent | 42,218 | 52,038 |
Investments | 93,037 | 78,791 |
Utility plant in service - net | 4,733,788 | $ 4,363,188 |
IERCo guarantee of BCC reclamation obligation | $ 47,600 |  |
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service | 2.89% | 2.66% |
Other Nonoperating Income (Expense) | $ 34,713 | $ 9,147 | (3,171)
Other electric utility operating expenses | 38,550 | 37,325 | $ 34,673
Other property, net of accumulated depreciation | $ 4,310 | $ 4,558 |
IDACORP Financial Services Limited Partnership Interests |  |  |
Significant Accounting Policies |  |  |
Variable interest entities ownership percentage minimum | 4.00% |  |
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 | $ 57,300 |  |

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