REGULATORY MATTERS: Regulatory Requests (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Oct. 31, 2022	Dec. 31, 2021	Jun. 30, 2021
Public Utilities, General Disclosures [Line Items]
Regulatory Assets	$ 1,501,961		$ 1,533,654
IDAHO | Wildfire mitigation plan costs
Public Utilities, General Disclosures [Line Items]
Regulatory Assets	$ 27,100
IDAHO | Wildfire mitigation plan costs | Plant in service
Public Utilities, General Disclosures [Line Items]
Requested deferral of costs				$ 35,000
Other Operating and Maintenance Expenses | IDAHO | Wildfire mitigation plan costs
Public Utilities, General Disclosures [Line Items]
Requested deferral of costs		$ 16,000		$ 47,000