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REGULATORY MATTERS: Oregon Base Rate Changes (Details) - USD ($) $ in Thousands			12 Months Ended
		Oct. 15, 2024	Dec. 31, 2026	Oct. 15, 2025	Dec. 31, 2024	Dec. 31, 2025	Jun. 01, 2025	Jun. 01, 2024	Jun. 01, 2023
Oregon Base Rate Changes [Line Items]
Regulatory Assets					$ 1,507,372	$ 1,564,458
Power supply costs
Oregon Base Rate Changes [Line Items]
Regulatory Assets	[1]				$ 18,507	0
Oregon jurisdiction
Oregon Base Rate Changes [Line Items]
Annual Power Cost Update							$ (1,800)	$ (6,900)	$ 7,700
OREGON | Wildfire Mitigation Plan Deferral
Oregon Base Rate Changes [Line Items]
Regulatory Assets						3,500
OREGON | Subsequent Event
Oregon Base Rate Changes [Line Items]
Approved Rate Increase (Decrease), Amount			$ (600)
Approved Rate Increase (Decrease), Percentage			0.90%
OREGON | Subsequent Event | Valmy Plant
Oregon Base Rate Changes [Line Items]
Approved Rate Increase (Decrease), Amount			$ (1,200)
OREGON | Subsequent Event | Boardman Plant
Oregon Base Rate Changes [Line Items]
Approved Rate Increase (Decrease), Amount			(100)
OREGON | Subsequent Event | Wildfire mitigation plan costs
Oregon Base Rate Changes [Line Items]
Approved Rate Increase (Decrease), Amount			700
OREGON | 2023 Rate Case
Oregon Base Rate Changes [Line Items]
Approved Rate Increase (Decrease), Amount				$ 6,700
Approved Return on Equity, Percentage		9.50%
Approved Rate Increase (Decrease), Percentage				12.14%
OREGON | 2023 Rate Case | Cost of Capital and Capital Structure
Oregon Base Rate Changes [Line Items]
Authorized Rate of Return in Rate Case		7.302%
Total Retail Rate Base		$ 188,900
OREGON | 2023 Rate Case | Cost of Debt Capital Structure [Domain]
Oregon Base Rate Changes [Line Items]
Approved Rate of Return		5.104%
IDAHO | Wildfire Mitigation Plan Deferral
Oregon Base Rate Changes [Line Items]
Regulatory Assets						88,200
IDAHO | 2023 Rate Case
Oregon Base Rate Changes [Line Items]
Approved Return on Equity, Percentage					9.60%
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount					$ (54,700)
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage					4.25%
IDAHO | 2025 Rate Case | Wildfire Mitigation Plan Deferral
Oregon Base Rate Changes [Line Items]
Regulatory Assets						73,900
IDAHO | 2025 Rate Case | Subsequent Event
Oregon Base Rate Changes [Line Items]
Approved Rate Increase (Decrease), Amount			$ 110,000
Approved Return on Equity, Percentage			9.60%
Approved Rate Increase (Decrease), Percentage			7.48%
IDAHO | Wildfire mitigation plan costs | Wildfire Mitigation Plan Deferral
Oregon Base Rate Changes [Line Items]
Regulatory Assets						$ 700
[1] This item is discussed in more detail in this Note 3 - "Regulatory Matters."

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[Line Items] for 2011 Oregon General Rate Case [Table]

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The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 980
-SubTopic 340
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478742/980-340-50-1

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