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LONG-TERM DEBT: Long-term Debt Level 4 (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Total first mortgage bonds $ 1,555,000 $ 1,425,000
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
Milner Dam note guarantee 2,127 3,191
Unamortized issuance costs and discounts (20,998) (18,850)
Total outstanding debt [1] 1,726,474 1,599,686
Current maturities of long-term debt (1,064) (1,064)
Long-Term Debt 1,725,410 $ 1,598,622
6.025% Series due 2018    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage   6.025%
First mortgage bonds $ 0 $ 120,000
6.15% Series due 2019    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 6.15% 6.15%
First mortgage bonds $ 100,000 $ 100,000
4.50% Series due 2020    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 4.50% 4.50%
First mortgage bonds $ 130,000 $ 130,000
3.40% Series due 2020    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 3.40% 3.40%
First mortgage bonds $ 100,000 $ 100,000
2.95% Series Due 2022    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 2.95% 2.95%
First mortgage bonds $ 75,000 $ 75,000
2.50% Series due 2023    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 2.50% 2.50%
First mortgage bonds $ 75,000 $ 75,000
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
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
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
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
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
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
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
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
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
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
3.65% Series due 2045    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 3.65%  
First mortgage bonds $ 250,000 $ 0
5.15% Pollution Control Bond due 2024    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [2] 5.15% 5.15%
Pollution control revenue bonds 5.15 Series due 2024 [2] $ 49,800 $ 49,800
5.25% Pollution Control Bond due 2026    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [2] 5.25% 5.25%
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 1,721,000  
Idaho Power Company    
Debt Instrument [Line Items]    
Long-Term Debt $ 1,725,410 $ 1,598,622
Effective cost of outstanding debt 4.96% 5.19%
[1] At December 31, 2015 and 2014, the overall effective cost of Idaho Power's outstanding debt was 4.96 percent and 5.19 percent, respectively.
[2] Humboldt County and Sweetwater County Pollution Control Revenue Bonds are secured by the first mortgage, bringing the total first mortgage bonds outstanding at December 31, 2015 to $1.721 billion.