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REGULATORY MATTERS: Idaho Jurisdiction Power Cost Adjustment Mechanism (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |  |
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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."

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- 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

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- 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

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- 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

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- 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

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- 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

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- 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

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- 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

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

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

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

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

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

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

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