COMMITMENTS: Purchase Obligations (Details) - Idaho Power Company $ in Thousands	9 Months Ended
	Sep. 30, 2026 USD ($)	May 01, 2028 MWh
Forecast \| PURPA and Non-PURPA Power Production
Long-Term Purchase Commitment
Nameplate Capacity \| MWh		200
Forecast \| PURPA and Non-PURPA Power Production Energy Storage
Long-Term Purchase Commitment
Nameplate Capacity \| MWh		100
Long-Term Contract for Purchase of Gas Transportation Capacity
Long-Term Purchase Commitment
Purchase Obligation	$ 1,600,000
Long-Term Contract for Purchase of Gas Transportation Capacity \| Maximum
Long-Term Purchase Commitment
Long-Term Purchase Commitment, Period	15 years
Capital Addition Purchase Commitments
Long-Term Purchase Commitment
Purchase Obligation	$ 218,000
Long-Term Contract for Purchase of Wind Generation
Long-Term Purchase Commitment
Purchase Obligation	$ 94,600
Long-Term Contract for Purchase of Wind Generation \| Maximum
Long-Term Purchase Commitment
Long-Term Purchase Commitment, Period	5 years
Long-Term Power for Purchase of Solar Power and Battery Storage Capacity
Long-Term Purchase Commitment
Purchase Obligation	$ 796,200
Long-Term Power for Purchase of Solar Power and Battery Storage Capacity \| Maximum
Long-Term Purchase Commitment
Long-Term Purchase Commitment, Period	20 years
Long-Term Contract for Purchase of Hydro Power
Long-Term Purchase Commitment
Purchase Obligation	$ 10,300
Long-Term Contract for Purchase of Hydro Power \| Maximum
Long-Term Purchase Commitment
Long-Term Purchase Commitment, Period	20 years