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LONG-TERM DEBT: Long-term Debt Level 4 (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Apr. 30, 2020
Debt Instrument [Line Items]      
Total first mortgage bonds $ 1,800,000 $ 1,800,000  
Pollution control revenue bonds Variable Rate Series 2000 due 2027 4,360 4,360  
Total pollution control revenue bonds 170,460 170,460  
American Falls bond guarantee 19,885 19,885  
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net 10,295 10,069  
Total outstanding debt [1] 2,000,640 2,000,414  
Current maturities of long-term debt 0 0  
Long-Term Debt 2,000,640 2,000,414  
Idaho Power Company      
Debt Instrument [Line Items]      
Total outstanding debt $ 2,000,640 $ 2,000,414  
Effective cost of outstanding debt 4.40% 4.40%  
First Mortgage Bonds 2.50 Series due 2023      
Debt Instrument [Line Items]      
First mortgage bonds $ 75,000 $ 75,000  
Debt Instrument, Interest Rate, Stated Percentage 2.50% 2.50%  
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 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 5.30 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 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% 4.20%
Debt Instrument, Interest Rate, Reoffer Yield     3.422%
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  
Secured debt including Humboldt County and Sweetwater County pollution control revenue bonds      
Debt Instrument [Line Items]      
Total first mortgage bonds 1,966,000    
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%  
[1] At both December 31, 2021 and 2020, the overall effective cost rate of Idaho Power's outstanding debt was 4.40 percent.
[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, 2021, to $1.966 billion