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REGULATORY MATTERS: Oregon Base Rate Changes (Details) - USD ($) $ in Thousands							48 Months Ended
		Oct. 15, 2024	Jun. 01, 2020	Jun. 01, 2018	Oct. 01, 2012	Mar. 01, 2012	Oct. 31, 2024	Dec. 31, 2023	Jun. 01, 2023	Dec. 31, 2022	Jun. 01, 2022	Jun. 01, 2021
Oregon Base Rate Changes [Line Items]
Regulatory Assets								$ 1,653,050		$ 1,501,961
Power supply costs
Oregon Base Rate Changes [Line Items]
Regulatory Assets	[1]							115,525		129,309
Oregon Base Rate Changes
Oregon Base Rate Changes [Line Items]
Approved Rate Increase (Decrease), Amount						$ 1,800
Approved Return on Equity, Percentage						9.90%
Authorized Rate of Return in Rate Case						7.757%
Oregon jurisdiction
Oregon Base Rate Changes [Line Items]
Annual Power Cost Update									$ 7,700		$ 4,000	$ 2,400
OREGON | Power supply costs
Oregon Base Rate Changes [Line Items]
Regulatory Assets								$ 900		$ 1,100
OREGON | Oregon Base Rate Changes
Oregon Base Rate Changes [Line Items]
Approved Rate Increase (Decrease), Amount					$ 3,000
OREGON | Oregon Base Rate Changes | Subsequent Event
Oregon Base Rate Changes [Line Items]
Approved Rate Increase (Decrease), Amount							$ 400
OREGON | May 2018 Tax Reform Settlement Stipulation
Oregon Base Rate Changes [Line Items]
Approved Rate Increase (Decrease), Amount			$ 1,500	$ 1,500
OREGON | Idaho Power Company | Subsequent Event
Oregon Base Rate Changes [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount		$ 10,700
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage		19.28%
Public Utilities, Requested Rate Increase (Decrease), Percentage		1040.00%
OREGON | Idaho Power Company | Subsequent Event | Cost of Capital and Capital Structure
Oregon Base Rate Changes [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Percentage		780.70%
Total Retail Rate Base		$ 188,900
[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 authorized rate of return, whether requested or approved, in the rate case.

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Total retail rate base contemplated in the rate case.

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Amount of public utility's amended requested rate increase (decrease) with regulatory agency.

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Percentage of public utility's amended requested rate increase (decrease) with regulatory agency.

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Percentage of public utility's requested rate increase (decrease) with regulatory agency.

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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//1943274/2147481878/980-340-50-1

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