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REGULATORY MATTERS: Idaho Jurisdiction Power Cost Adjustment Mechanism (Details) - USD ($) |  |  |  | 12 Months Ended | 24 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 01, 2023 | Jun. 01, 2022 | Jun. 01, 2021 | May 31, 2025 | May 31, 2025 | Dec. 31, 2023 | Dec. 31, 2022
Idaho Power Cost Adjustment Mechanism [Line Items] |  |  |  |  |  |  |  |
Regulatory Liabilities |  |  |  |  |  |  | $ 882,553,000 | $ 860,601,000
Regulatory Assets |  |  |  |  |  |  | 1,653,050,000 | 1,501,961,000
Power supply costs |  |  |  |  |  |  |  |
Idaho Power Cost Adjustment Mechanism [Line Items] |  |  |  |  |  |  |  |
Regulatory Assets | [1] |  |  |  |  |  | $ 115,525,000 | 129,309,000
Idaho Power Cost Adjustment |  |  |  |  |  |  |  |
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 |  | $ 105,100,000 | $ 94,900,000 | $ 39,100,000 |  |  |  |
Idaho Power Cost Adjustment | Subsequent Event |  |  |  |  |  |  |  |
Idaho Power Cost Adjustment Mechanism [Line Items] |  |  |  |  |  |  |  |
Approved Rate Increase (Decrease), Amount |  |  |  |  | $ 95,100,000 | $ 200,200,000 |  |
Idaho PCA includes power supply and deferral balance. | Subsequent Event |  |  |  |  |  |  |  |
Idaho Power Cost Adjustment Mechanism [Line Items] |  |  |  |  |  |  |  |
Approved Rate Increase (Decrease), Amount |  |  |  |  |  | $ 190,200,000 |  |
Oregon jurisdiction |  |  |  |  |  |  |  |
Idaho Power Cost Adjustment Mechanism [Line Items] |  |  |  |  |  |  |  |
Annual Power Cost Update |  | $ 7,700,000 | $ 4,000,000 | $ 2,400,000 |  |  |  |
OREGON | Power supply costs |  |  |  |  |  |  |  |
Idaho Power Cost Adjustment Mechanism [Line Items] |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  | $ 900,000 | $ 1,100,000
[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-types1: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-types1: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//1943274/2147481878/980-340-50-1 + Details
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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//1943274/2147481854/980-405-25-1 + 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: |
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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_IdahoPCAIncludesPowerSupplyAndDeferralBalanceMember
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_OR
Namespace Prefix: |
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Balance Type: |
Period Type: |