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

No definition available.

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

- Definition

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

+ References

No definition available.

+ Details

Name:	ida_AuthorizedReturnOnEquityInRateCaseMinimum
Namespace Prefix:	ida_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Investment Tax Credits, Remains Available

+ References

No definition available.

+ Details

Name:	ida_InvestmentTaxCreditsRemainsAvailable
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

Name:	ida_PercentageCapOnFcaAdjustment
Namespace Prefix:	ida_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Public Utilities, Annual Amortization Cap, Value

+ References

No definition available.

+ Details

Name:	ida_PublicUtilitiesAnnualAmortizationCapValue
Namespace Prefix:	ida_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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

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

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesApprovedRateIncreaseDecreaseAmount
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

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

+ Details

Name:	us-gaap_RegulatoryAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	ida_RateCasesAxis=ida_SettlementStipulationInvestmentTaxCreditsAndIdahoSharingMechanismMember
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_RateCaseMatterAxis=ida_IdahoPowerCostAdjustmentMember
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_OregonPowerCostAdjustmentWildfireMember
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_RequestedYearAxis=ida_A2025Member
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
Balance Type:
Period Type:

- Details

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

- Details

Name:	ida_RateCasesAxis=ida_A2025RateCaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ida_RateCasesAxis=ida_October2025SettlementStipulationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

REGULATORY MATTERS: Level 4 (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2027	May 31, 2027	Dec. 31, 2026	Jun. 01, 2026	Jun. 01, 2025	Jan. 01, 2024
Settlement Stipulation - Investment Tax Credits and Idaho Sharing Mechanism
Regulatory Matters
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount	$ 0	$ 2,500	$ 6,300	$ 39,000
Settlement Stipulation - Investment Tax Credits and Idaho Sharing Mechanism \| ADITC
Regulatory Matters
Investment Tax Credits, Remains Available	$ 154,000		$ 154,000
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 \| Wildfire Mitigation Plan Deferral
Regulatory Matters
Regulatory Asset	$ 90,800		$ 90,800
IDAHO \| Wildfire Mitigation Plan Deferral \| 2025 Rate Case
Regulatory Matters
Regulatory Asset	65,100		65,100
IDAHO \| Subsequent Event \| October 2025 Settlement Stipulation
Regulatory Matters
Annual amortization cap							$ 55,000
Oregon jurisdiction \| Wildfire Mitigation Plan Deferral
Regulatory Matters
Regulatory Asset	3,200		3,200
Oregon jurisdiction \| Wildfire Mitigation Plan Deferral \| 2025 Rate Case
Regulatory Matters
Regulatory Asset	$ 2,000		$ 2,000