FAIR VALUE MEASUREMENTS: Fair Value Carrying Amounts and Estimated Fair Values (Details) - USD ($) $ in Thousands		Dec. 31, 2022	Dec. 31, 2021
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivable	[1]	$ 3,871	$ 3,804
Long-term debt	[1]	2,194,145	2,000,640
Debt Securities, Held-to-Maturity, Fair Value	[1]	30,475	0
Carrying Amount | Idaho Power Company
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	[1]	2,194,145	2,000,640
Debt Securities, Held-to-Maturity, Fair Value	[1]	30,475	0
Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivable	[1]	3,871	3,804
Long-term debt	[1]	1,953,470	2,381,172
Debt Securities, Held-to-Maturity, Fair Value	[1]	25,452	0
Estimated Fair Value | Idaho Power Company
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	[1]	1,953,470	2,381,172
Debt Securities, Held-to-Maturity, Fair Value	[1]	$ 25,452	$ 0

[1] Notes receivable are categorized as Level 3 and held-to-maturity securities and long-term debt are categorized as Level 2 of the fair value hierarchy, as defined earlier in this Note 16 - "Fair Value Measurements."