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LONG-TERM DEBT: Long-term Debt Level 3 (Tables) | 12 Months Ended
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Dec. 31, 2023
Debt Instrument [Line Items] |
Schedule of Long-term Debt Instruments | The following table summarizes IDACORP's and Idaho Power's long-term debt at December 31 (in thousands of dollars):
|  | 2023 |  | 2022
First mortgage bonds: |  |  |  |
2.50% Series due 2023 |  | $ | — |  |  | $ | 75,000 |
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 |
5.30% 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 |  |  | — |
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 |  |  | — |
5.50% Series due 2053 |  | 400,000 |  |  | — |
5.80% Series due 2054 |  | 350,000 |  |  | — |
Total first mortgage bonds |  | 2,645,000 |  |  | 1,848,000 |
Pollution control revenue bonds: |  |  |  |
1.45% Series due 2024(1) |  | 49,800 |  |  | 49,800 |
1.70% Series due 2026(1) |  | 116,300 |  |  | 116,300 |
Total pollution control revenue bonds |  | 166,100 |  |  | 166,100 |
Floating Rate Term Loan Facility due 2024 |  | — |  |  | 150,000 |
American Falls Variable Rate bond guarantee due 2025 |  | 19,885 |  |  | 19,885 |
Unamortized premium/discount and issuance costs |  | (5,395) |  |  | 10,160 |
Total IDACORP and Idaho Power outstanding debt(2) |  | 2,825,590 |  |  | 2,194,145 |
Current maturities of long-term debt |  | (49,800) |  |  | — |
Total long-term debt |  | $ | 2,775,790 |  |  | $ | 2,194,145 |
(1) Humboldt County and Sweetwater County Pollution Control Revenue Bonds are secured by the first mortgage bonds, bringing the total first mortgage bonds outstanding at December 31, 2023, to $2.811 billion. (2) At December 31, 2023 and 2022, the overall effective cost rate of Idaho Power's outstanding debt was 4.98 percent and 4.60 percent, respectively.
Schedule of Maturities of Long-term Debt | At December 31, 2023, the maturities for the aggregate amount of IDACORP and Idaho Power long-term debt outstanding were as follows (in thousands of dollars):
| 2024 |  | 2025 |  | 2026 |  | 2027 |  | 2028 |  | Thereafter
| $ | 49,800 |  |  | $ | 19,885 |  |  | $ | 116,300 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,645,000 |

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