Annual fixed cost adjustment mechanism deferral amount, whether approved or requested.

No definition available.

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- Definition

The minimum authorized return on equity, whether requested or approved, in the rate case.

+ References

No definition available.

+ Details

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- Definition

Investment Tax Credits, Remains Available

+ References

No definition available.

+ Details

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- Definition

Percentage cap on the FCA adjustment.

+ References

No definition available.

+ Details

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- Definition

Public Utilities, Annual Amortization Cap, Value

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Rate Case [Line Items]

+ References

No definition available.

+ Details

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- Definition

Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to investment tax credit.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12A
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-12A

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-12

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- Definition

Amount of public utility's approved rate increase (decrease) by regulatory agency.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

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

+ References

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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- Details

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- Details

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REGULATORY MATTERS: Level 4 (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2027	May 31, 2027	Jun. 01, 2026	Jun. 01, 2024	Jan. 01, 2024
Settlement Stipulation - Investment Tax Credits and Idaho Sharing Mechanism
Regulatory Matters
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount	$ 0	$ 6,300	$ 17,200	$ 36,500
Settlement Stipulation - Investment Tax Credits and Idaho Sharing Mechanism \| ADITC
Regulatory Matters
Investment Tax Credits, Remains Available	$ 156,300		$ 156,300
Idaho fixed cost adjustment mechanism
Regulatory Matters
Percentage cap on the FCA adjustment	3.00%		3.00%
Annual fixed cost adjustment mechanism deferral								$ 3,100
Idaho Power Cost Adjustment
Regulatory Matters
Annual fixed cost adjustment mechanism deferral							$ (2,000)
Subsequent Event \| Idaho Power Cost Adjustment
Regulatory Matters
Public Utilities, Approved Rate Increase (Decrease), Amount						$ 51,300
Subsequent Event \| Idaho fixed cost adjustment mechanism
Regulatory Matters
Public Utilities, Approved Rate Increase (Decrease), Amount						(5,100)
Subsequent Event \| Oregon jurisdiction
Regulatory Matters
Public Utilities, Approved Rate Increase (Decrease), Amount						700
Subsequent Event \| Oregon Power Cost Adjustment Wildfire
Regulatory Matters
Public Utilities, Approved Rate Increase (Decrease), Amount						$ 1,900
Subsequent Event \| Wildfire mitigation plan costs \| Oregon jurisdiction \| 2025
Regulatory Matters
Public Utilities, Requested Rate Increase (Decrease), Amount					$ 3,100
IDAHO \| 2023 Settlement Stipulation
Regulatory Matters
Minimum authorized return on equity									9.12%
IDAHO \| October 2025 Settlement Stipulation
Regulatory Matters
Annual amortization cap			$ 55,000
IDAHO \| Wildfire Mitigation Plan Deferral
Regulatory Matters
Regulatory Asset	$ 90,300		90,300
IDAHO \| Wildfire Mitigation Plan Deferral \| 2025 Rate Case
Regulatory Matters
Regulatory Asset	68,100		68,100
Oregon jurisdiction \| Wildfire Mitigation Plan Deferral \| 2025 Rate Case
Regulatory Matters
Regulatory Asset	$ 2,900		$ 2,900