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LONG-TERM DEBT: Long-term Debt Level 4 (Details) - USD ($)
$ in Thousands

Dec. 31, 2025

Dec. 31, 2024

Debt Instrument [Line Items]

Total first mortgage bonds

$ 3,345,000

$ 2,945,000

Total pollution control revenue bonds

116,300

116,300

American Falls bond guarantee

0

19,885

Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net

(13,962)

(7,523)

Debt, Long-Term and Short-Term, Combined Amount

^[1]

3,447,338

3,073,662

Current maturities of long-term debt

(116,300)

(19,885)

Long-Term Debt

$ 3,331,038

$ 3,053,777

Idaho Power Company

Debt Instrument [Line Items]

Effective cost of outstanding debt

5.13%

5.03%

First Mortgage Bonds 1.90 Series L Due July 15 2030

Debt Instrument [Line Items]

First mortgage bonds

$ 80,000

$ 80,000

Debt Instrument, Interest Rate, Stated Percentage

1.90%

1.90%

First mortgage bonds 6.00 Series due 2032

Debt Instrument [Line Items]

First mortgage bonds

$ 100,000

$ 100,000

Debt Instrument, Interest Rate, Stated Percentage

6.00%

6.00%

First Mortgage Bonds 4.99 Series Due 2032

Debt Instrument [Line Items]

First mortgage bonds

$ 23,000

$ 23,000

Debt Instrument, Interest Rate, Stated Percentage

4.99%

4.99%

First mortgage bonds 5.50 Series due 2033

Debt Instrument [Line Items]

First mortgage bonds

$ 70,000

$ 70,000

Debt Instrument, Interest Rate, Stated Percentage

5.50%

5.50%

First mortgage bonds 5.50 Series due 2034

Debt Instrument [Line Items]

First mortgage bonds

$ 50,000

$ 50,000

Debt Instrument, Interest Rate, Stated Percentage

5.50%

5.50%

First mortgage bonds 5.875 Series due 2034

Debt Instrument [Line Items]

First mortgage bonds

$ 55,000

$ 55,000

Debt Instrument, Interest Rate, Stated Percentage

5.875%

5.875%

First Mortgage Bonds 5.20 Series M Due 2034

Debt Instrument [Line Items]

First mortgage bonds

$ 300,000

$ 300,000

Debt Instrument, Interest Rate, Stated Percentage

5.20%

5.20%

First mortgage bonds 5.30 Series due 2035

Debt Instrument [Line Items]

First mortgage bonds

$ 60,000

$ 60,000

Debt Instrument, Interest Rate, Stated Percentage

5.30%

5.30%

First mortgage bonds 6.30 Series due 2037

Debt Instrument [Line Items]

First mortgage bonds

$ 140,000

$ 140,000

Debt Instrument, Interest Rate, Stated Percentage

6.30%

6.30%

First mortgage bonds 6.25 Series due 2037

Debt Instrument [Line Items]

First mortgage bonds

$ 100,000

$ 100,000

Debt Instrument, Interest Rate, Stated Percentage

6.25%

6.25%

First mortgage bonds 4.85 Series due 2040

Debt Instrument [Line Items]

First mortgage bonds

$ 100,000

$ 100,000

Debt Instrument, Interest Rate, Stated Percentage

4.85%

4.85%

First Mortgage Bonds 4.30 Series Due 2042

Debt Instrument [Line Items]

First mortgage bonds

$ 75,000

$ 75,000

Debt Instrument, Interest Rate, Stated Percentage

4.30%

4.30%

First Mortgage Bonds 5.06 Series Due 2042

Debt Instrument [Line Items]

First mortgage bonds

$ 25,000

$ 25,000

Debt Instrument, Interest Rate, Stated Percentage

5.06%

5.06%

First Mortgage Bonds 5.06 Series Due 2043

Debt Instrument [Line Items]

First mortgage bonds

$ 60,000

$ 60,000

Debt Instrument, Interest Rate, Stated Percentage

5.06%

5.06%

First Mortgage Bonds 4.00 Series due 2043

Debt Instrument [Line Items]

First mortgage bonds

$ 75,000

$ 75,000

Debt Instrument, Interest Rate, Stated Percentage

4.00%

4.00%

First mortgage bonds 3.65% Series due 2045

Debt Instrument [Line Items]

First mortgage bonds

$ 250,000

$ 250,000

Debt Instrument, Interest Rate, Stated Percentage

3.65%

3.65%

First mortgage bonds 4.05 Series due 2046

Debt Instrument [Line Items]

First mortgage bonds

$ 120,000

$ 120,000

Debt Instrument, Interest Rate, Stated Percentage

4.05%

4.05%

First Mortgage Bonds 4.20 K Series due 2048

Debt Instrument [Line Items]

First mortgage bonds

$ 450,000

$ 450,000

Debt Instrument, Interest Rate, Stated Percentage

4.20%

4.20%

First Mortgage Bonds 5.20 Series Due 2053

Debt Instrument [Line Items]

First mortgage bonds

$ 62,000

$ 62,000

Debt Instrument, Interest Rate, Stated Percentage

5.20%

5.20%

First Mortgage Bonds 5.5% Series K Due 2053 [Member]

Debt Instrument [Line Items]

First mortgage bonds

$ 400,000

$ 400,000

Debt Instrument, Interest Rate, Stated Percentage

5.50%

5.50%

First Mortgage Bonds 5.8% Series K Due 2054

Debt Instrument [Line Items]

First mortgage bonds

$ 350,000

$ 350,000

Debt Instrument, Interest Rate, Stated Percentage

5.80%

5.80%

First Mortgage Bonds 5.7% Series K Due 2055

Debt Instrument [Line Items]

First mortgage bonds

$ 400,000

$ 0

Debt Instrument, Interest Rate, Stated Percentage

5.70%

5.70%

Pollution Control Bond 1.70 due 2026

Debt Instrument [Line Items]

Debt Instrument, Interest Rate, Stated Percentage

1.70%

1.70%

Pollution control revenue bonds 5.25 Series due 2026

^[2]

$ 116,300

$ 116,300

Secured debt including Humboldt County and Sweetwater County pollution control revenue bonds

Debt Instrument [Line Items]

Total first mortgage bonds

$ 3,461,000

[1]	At December 31, 2025 and 2024, the overall effective cost rate of Idaho Power's outstanding debt was 5.13 percent and 5.03 percent, respectively.
[2]	Sweetwater County Pollution Control Revenue Bonds are secured by the first mortgage bonds, bringing the total first mortgage bonds outstanding at December 31, 2025, to $3.461 billion

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