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

No definition available.

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Namespace Prefix:	ida_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	ida_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Investment Tax Credits, Remains Available

+ References

No definition available.

+ Details

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Namespace Prefix:	ida_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage cap on the FCA adjustment.

+ References

No definition available.

+ Details

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Namespace Prefix:	ida_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Rate Case [Line Items]

+ References

No definition available.

+ Details

Name:	ida_RateCaseLineItems
Namespace Prefix:	ida_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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

+ Details

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Namespace Prefix:	us-gaap_
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

Name:	us-gaap_PublicUtilitiesRequestedRateIncreaseDecreaseAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesRequestedRateIncreaseDecreasePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ida_AvailabilityFutureUseAxis=ida_ADITCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ida_RateCasesAxis=ida_IdahoFixedCostAdjustmentNettingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ida_RateCasesAxis=ida_IdahoJurisdictionFixedCostAdjustmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ida_RateCasesAxis=ida_IdahoPowerCostAdjustmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ida_RateCasesAxis=ida_OregonJurisdictionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ida_RateCasesAxis=ida_IdahoPowerFixedCostAdjustmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ida_RateCaseMatterAxis=ida_WildfireMitigationPlanCostsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ida_RateCasesAxis=ida_IdahoJurisdictionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ida_RateCaseMatterAxis=ida_HellsCanyonComplexMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ida_RegulatoryJurisdictionAxis=stpr_ID
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ida_RateCasesAxis=ida_A2023SettlementStipulationMember
Namespace Prefix:
Data Type:	na
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REGULATORY MATTERS: Level 4 (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2026	May 31, 2026	Jun. 01, 2024	Jan. 01, 2024	Jun. 01, 2023
Settlement Stipulation - Investment Tax Credits and Idaho Sharing Mechanism
Regulatory Matters
Additional accumulated deferred investment tax credits (ADITC) amortization	$ 19.3	$ 12.5
Settlement Stipulation - Investment Tax Credits and Idaho Sharing Mechanism \| ADITC
Regulatory Matters
Investment Tax Credits, Remains Available	$ 57.8
Idaho fixed cost adjustment mechanism
Regulatory Matters
Percentage cap on the FCA adjustment	3.00%
Idaho Jurisdiction Fixed Cost Adjustment
Regulatory Matters
Annual fixed cost adjustment mechanism deferral					$ 3.0		$ 36.8
Subsequent Event \| Idaho Power Cost Adjustment
Regulatory Matters
Public Utilities, Requested Rate Increase (Decrease), Amount				$ (94.8)
Subsequent Event \| Idaho fixed cost adjustment mechanism
Regulatory Matters
Public Utilities, Requested Rate Increase (Decrease), Amount				(39.8)
Subsequent Event \| Oregon jurisdiction
Regulatory Matters
Public Utilities, Requested Rate Increase (Decrease), Amount				(1.1)
Subsequent Event \| Idaho Power Fixed Cost Adjustment
Regulatory Matters
Public Utilities, Requested Rate Increase (Decrease), Amount				$ (40.7)
Public Utilities, Requested Rate Increase (Decrease), Percentage				5.28%
Subsequent Event \| Wildfire mitigation plan costs \| Oregon jurisdiction
Regulatory Matters
Public Utilities, Requested Rate Increase (Decrease), Amount			$ 3.3
Subsequent Event \| Wildfire mitigation plan costs \| Idaho Power Fixed Cost Adjustment
Regulatory Matters
Public Utilities, Requested Rate Increase (Decrease), Amount			$ 23.2
Subsequent Event \| Hells Canyon Complex \| Idaho Power Fixed Cost Adjustment
Regulatory Matters
Public Utilities, Requested Rate Increase (Decrease), Amount				$ 29.7
IDAHO \| 2023 Settlement Stipulation
Regulatory Matters
Minimum authorized return on equity						9.12%