COMMITMENTS: Purchase Obligations (Details) - Idaho Power Company $ in Thousands	72 Months Ended	240 Months Ended
	Dec. 31, 2033	Apr. 30, 2048	Aug. 30, 2046	May 02, 2030 USD ($)	Jun. 30, 2029 USD ($)	May 01, 2028 USD ($) MWh	Jan. 01, 2028 USD ($)	Sep. 01, 2026 USD ($)
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 \| Subsequent Event
Long-Term Purchase Commitment
Purchase Obligation				$ 1,600,000
Capital Addition Purchase Commitments \| Subsequent Event
Long-Term Purchase Commitment
Purchase Obligation					$ 218,000
Long-Term Power Production (including PURPA) Purchase Commitment \| Subsequent Event
Long-Term Purchase Commitment
Purchase Obligation						$ 796,200		$ 10,300
Long-Term Purchase Commitment, Period		20 years	20 years
Long-Term Contract for Purchase of Wind generation \| Subsequent Event
Long-Term Purchase Commitment
Purchase Obligation							$ 94,600
Long-Term Purchase Commitment, Period	5 years