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DERIVATIVE FINANCIAL INSTRUMENTS: Derivative Instruments, Notional Amounts (Details) (Details)
Dec. 31, 2014
MWh
Dec. 31, 2013
MWh
Electricity [Member] | Long [Member]    
Derivative    
Derivative, Nonmonetary Notional Amount 115,000invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_EnergyAxis
= ida_ElectricityMember
/ us-gaap_PositionAxis
= us-gaap_LongMember		 89,000invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_EnergyAxis
= ida_ElectricityMember
/ us-gaap_PositionAxis
= us-gaap_LongMember
Electricity [Member] | Short [Member]    
Derivative    
Derivative, Nonmonetary Notional Amount 238,000invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_EnergyAxis
= ida_ElectricityMember
/ us-gaap_PositionAxis
= us-gaap_ShortMember		 603,000invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_EnergyAxis
= ida_ElectricityMember
/ us-gaap_PositionAxis
= us-gaap_ShortMember
Fuel [Member] | Long [Member]    
Derivative    
Derivative, Nonmonetary Notional Amount 6,913,000invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_EnergyAxis
= us-gaap_FuelMember
/ us-gaap_PositionAxis
= us-gaap_LongMember		 10,804,000invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_EnergyAxis
= us-gaap_FuelMember
/ us-gaap_PositionAxis
= us-gaap_LongMember
Fuel [Member] | Short [Member]    
Derivative    
Derivative, Nonmonetary Notional Amount 409,000invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_EnergyAxis
= us-gaap_FuelMember
/ us-gaap_PositionAxis
= us-gaap_ShortMember		 555,000invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_EnergyAxis
= us-gaap_FuelMember
/ us-gaap_PositionAxis
= us-gaap_ShortMember
Diesel Fuel [Member] | Long [Member]    
Derivative    
Derivative, Nonmonetary Notional Amount 243,000invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_EnergyAxis
= ida_DieselFuelMember
/ us-gaap_PositionAxis
= us-gaap_LongMember		 906,000invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_EnergyAxis
= ida_DieselFuelMember
/ us-gaap_PositionAxis
= us-gaap_LongMember