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REGULATORY MATTERS: Idaho Jurisdiction Power Cost Adjustment Mechanism (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2026	May 31, 2026	May 31, 2025	May 31, 2024	Dec. 31, 2025	Jun. 01, 2025	Dec. 31, 2024	Jun. 01, 2024	Jun. 01, 2023
Idaho Power Cost Adjustment Mechanism [Line Items]
Regulatory Liabilities						$ 1,052,151		$ 984,326
Regulatory Assets						1,564,458		1,507,372
Power supply costs
Idaho Power Cost Adjustment Mechanism [Line Items]
Regulatory Assets	[1]					$ 0		$ 18,507
Idaho Power Cost Adjustment [Member]
Idaho Power Cost Adjustment Mechanism [Line Items]
Percentage to be Shared with Customers							95.00%
Percentage to be Shared with Entity							5.00%
Approved Rate Increase (Decrease), Amount				$ (35,700)	$ 105,100
Idaho Power Cost Adjustment [Member] | Subsequent Event
Idaho Power Cost Adjustment Mechanism [Line Items]
Approved Rate Increase (Decrease), Amount			$ (94,800)
Oregon jurisdiction
Idaho Power Cost Adjustment Mechanism [Line Items]
Annual Power Cost Update							$ (1,800)		$ (6,900)	$ 7,700
IDAHO | Idaho PCA includes power supply and deferral balance. | Subsequent Event
Idaho Power Cost Adjustment Mechanism [Line Items]
Approved Rate Increase (Decrease), Amount		$ 468,800
OREGON | Subsequent Event
Idaho Power Cost Adjustment Mechanism [Line Items]
Approved Rate Increase (Decrease), Amount		$ (600)
[1] This item is discussed in more detail in this Note 3 - "Regulatory Matters."

X

- Definition

Annual Power Cost Update request with OPUC

+ References

No definition available.

+ Details

Name:	ida_AnnualPowerCostUpdate
Namespace Prefix:	ida_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

[Line Items] for Idaho Power Cost Adjustment Mechanism [Table]

+ References

No definition available.

+ Details

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

X

- Definition

Percentage of earnings to be Shared with Customers that is above the applicable authorized rate of return in the rate case.

+ References

No definition available.

+ Details

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

X

- Definition

Percentage of earnings to be Shared with the Entity that is above the applicable authorized rate of return in the rate case.

+ References

No definition available.

+ Details

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

X

- 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

X

- 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

X

- Definition

The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 980
-SubTopic 405
-Name Accounting Standards Codification
-Section 25
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477571/980-405-25-1

+ Details

Name:	us-gaap_RegulatoryLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_RegulatoryAssetAxis=us-gaap_DeferredFuelCostsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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