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LONG-TERM DEBT: Long-term Debt Level 3 (Tables)
 12 Months Ended
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):
20232022
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 bonds2,645,000 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 bonds166,100 166,100 
Floating Rate Term Loan Facility due 2024— 150,000 
American Falls Variable Rate bond guarantee due 202519,885 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):
20242025202620272028Thereafter
$49,800 $19,885 $116,300 $— $— $2,645,000