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LONG-TERM DEBT: Long-term Debt Level 4 (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Apr. 01, 2023 | Mar. 08, 2023 | Dec. 31, 2022
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Debt Instrument [Line Items] |  |  |  |  |
Total first mortgage bonds |  | $ 2,645,000 |  |  | $ 1,848,000
Total pollution control revenue bonds |  | 166,100 |  |  | 166,100
American Falls bond guarantee |  | 19,885 |  |  | 19,885
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net |  | (5,395) |  |  | 10,160
Debt, Long-Term and Short-Term, Combined Amount | [1] | 2,825,590 |  |  | 2,194,145
Current maturities of long-term debt |  | (49,800) |  |  | 0
Long-Term Debt |  | $ 2,775,790 |  |  | $ 2,194,145
Idaho Power Company |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective cost of outstanding debt |  | 4.98% |  |  | 4.60%
First Mortgage Bonds 2.50 Series due 2023 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 2.50% | 2.50% |  | 2.50%
First mortgage bonds |  | $ 0 |  |  | $ 75,000
First Mortgage Bonds 1.90 Series L Due July 15 2030 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 1.90% |  |  | 1.90%
First mortgage bonds |  | $ 80,000 |  |  | $ 80,000
First mortgage bonds 6.00 Series due 2032 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.00% |  |  | 6.00%
First mortgage bonds |  | $ 100,000 |  |  | $ 100,000
First Mortgage Bonds 4.99 Series Due 2032 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.99% |  |  | 4.99%
First mortgage bonds |  | $ 23,000 |  |  | $ 23,000
First Mortgage Bonds 4.99 Series Due 2032 | Idaho Power Company |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
First mortgage bonds |  | $ 23,000 |  |  |
First mortgage bonds 5.50 Series due 2033 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.50% |  |  | 5.50%
First mortgage bonds |  | $ 70,000 |  |  | $ 70,000
First mortgage bonds 5.50 Series due 2034 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.50% |  |  | 5.50%
First mortgage bonds |  | $ 50,000 |  |  | $ 50,000
First mortgage bonds 5.875 Series due 2034 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.875% |  |  | 5.875%
First mortgage bonds |  | $ 55,000 |  |  | $ 55,000
First mortgage bonds 5.30 Series due 2035 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.30% |  |  | 5.30%
First mortgage bonds |  | $ 60,000 |  |  | $ 60,000
First mortgage bonds 6.30 Series due 2037 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.30% |  |  | 6.30%
First mortgage bonds |  | $ 140,000 |  |  | $ 140,000
First mortgage bonds 6.25 Series due 2037 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.25% |  |  | 6.25%
First mortgage bonds |  | $ 100,000 |  |  | $ 100,000
First mortgage bonds 4.85 Series due 2040 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.85% |  |  | 4.85%
First mortgage bonds |  | $ 100,000 |  |  | $ 100,000
First Mortgage Bonds 4.30 Series Due 2042 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.30% |  |  | 4.30%
First mortgage bonds |  | $ 75,000 |  |  | $ 75,000
First Mortgage Bonds 5.06 Series Due 2042 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.06% |  |  | 5.06%
First mortgage bonds |  | $ 25,000 |  |  | $ 25,000
First Mortgage Bonds 5.06 Series Due 2042 | Idaho Power Company |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
First mortgage bonds |  | $ 25,000 |  |  |
First Mortgage Bonds 5.06 Series Due 2043 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.06% |  |  |
First mortgage bonds |  | $ 60,000 |  |  | $ 0
First Mortgage Bonds 5.06 Series Due 2043 | Idaho Power Company |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
First mortgage bonds |  |  |  | $ 60,000 |
First Mortgage Bonds 4.00 Series due 2043 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.00% |  |  | 4.00%
First mortgage bonds |  | $ 75,000 |  |  | $ 75,000
First mortgage bonds 3.65% Series due 2045 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.65% |  |  | 3.65%
First mortgage bonds |  | $ 250,000 |  |  | $ 250,000
First mortgage bonds 4.05 Series due 2046 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.05% |  |  | 4.05%
First mortgage bonds |  | $ 120,000 |  |  | $ 120,000
First Mortgage Bonds 4.20 K Series due 2048 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.20% |  |  | 4.20%
First mortgage bonds |  | $ 450,000 |  |  | $ 450,000
First Mortgage Bonds 5.20 Series Due 2053 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.20% |  |  |
First mortgage bonds |  | $ 62,000 |  |  | 0
First Mortgage Bonds 5.20 Series Due 2053 | Idaho Power Company |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
First mortgage bonds |  |  |  | $ 62,000 |
First Mortgage Bonds 5.5% Series K Due 2053 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.50% |  |  |
First mortgage bonds |  | $ 400,000 |  |  | 0
First Mortgage Bonds 5.8% Series K Due 2054 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.80% |  |  |
First mortgage bonds |  | $ 350,000 |  |  | $ 0
Pollution Control Bonds 1.45 due 2024 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 1.45% |  |  | 1.45%
Pollution control revenue bonds 5.15 Series due 2024 | [2] | $ 49,800 |  |  | $ 49,800
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
Floating Rate Term Loan Facility Due 2024 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Floating Rate Term Loan Facility due 2024 |  | 0 |  |  | $ 150,000
Secured debt including Humboldt County and Sweetwater County pollution control revenue bonds |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total first mortgage bonds |  | $ 2,811,000 |  |  |
[1] | 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.
[2] | 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

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- Definition Carrying amount of collateralized debt obligations with maturities initially due after one year or beyond the operating cycle, if longer, excluding the current portion. Obligations include, but not limited to, mortgage loans, chattel loans, and other borrowings secured by assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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