FAIR VALUE MEASUREMENTS: Fair Value Measurements Level 4 (Details) - USD ($)		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, All Levels Transfers, Amount		$ 0	$ 0
Money market funds	[1]	80,406,000	56,048,000
Asset derivatives		6,598,000	1,995,000
Equity Securities, FV-NI		54,431,000	50,733,000
Liability derivatives		5,747,000	144,000
Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	[1]	80,406,000	56,048,000
Asset derivatives		6,596,000	1,995,000
Equity Securities, FV-NI		54,431,000	50,733,000
Other Assets, Fair Value Disclosure		0	0
Liability derivatives		34,000	134,000
Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	[1]	0	0
Asset derivatives		2,000	0
Equity Securities, FV-NI		0	0
Other Assets, Fair Value Disclosure		0	0
Liability derivatives		5,713,000	10,000
Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	[1]	0	0
Asset derivatives		0	0
Equity Securities, FV-NI		0	0
Other Assets, Fair Value Disclosure		0	0
Liability derivatives		0	0
Fair Value Measured at Net Asset Value Per Share [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Assets, Fair Value Disclosure		1,363,000	0
Idaho Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds		10,393,000	40,038,000
Idaho Power Company | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds		10,393,000	40,038,000
Idaho Power Company | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds		0	0
Idaho Power Company | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds		$ 0	$ 0

[1] Holding company only. Does not include amounts held by Idaho Power.