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REGULATORY MATTERS: Open Access Transmission Tariff Rates (Details) - Federal Open Access Transmission Tariff Rates - USD ($) | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
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Open Access Transmission Tariff Rates [Line Items] |  |  |  |
Open Access Transmission Tariff Rate | $ 34.16 | $ 31.55 | $ 30.74 | $ 31.42
Net Annual Transmission Revenue Requirement | $ 148,500,000 |  |  |

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- Definition The load change adjustment rate is an element of the rate mechanism that recognizes the power supply expenses recovered through base rates change as loads increase or decrease. Rate is per megawatt-hour. This tag can also represent the open access same time draft rate, which is stated in kW/yr. + References No definition available. + Details
Name: | ida_LoadChangeAdjustmentRateOrOpenAccessSameTimeDraftRates
Namespace Prefix: | ida_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Net annual transmission revenue requirement amount used to determine transmission rates for transmission services provided under open access transmission tariff. + References No definition available. + Details
Name: | ida_NetAnnualTransmissionRevenueRequirement
Namespace Prefix: | ida_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition [Line Items] for Open Access Transmission Tariff Rates [Table] + References No definition available. + Details
Name: | ida_OpenAccessTransmissionTariffRatesLineItems
Namespace Prefix: | ida_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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