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REGULATORY MATTERS: Idaho Base Rate Changes (Details) - USD ($) $ in Thousands |  | 12 Months Ended | 24 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 01, 2022 | Dec. 31, 2024 | May 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | May 31, 2025 | Jan. 01, 2024 | Jan. 01, 2023 | May 31, 2018
Idaho Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |  |
Net income attributable to IDACORP, Inc. |  |  |  | $ 261,195 | $ 258,982 | $ 245,550 |  |  |  |
Revenue from contracts with customers |  |  |  | 1,639,612 | 1,557,974 | 1,382,653 |  |  |  |
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount |  |  |  | 5,451 | 3,119 | 2,866 |  |  |  |
Idaho Power Company |  |  |  |  |  |  |  |  |  |
Idaho Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount |  |  |  | 5,451 | $ 3,119 | $ 2,866 |  |  |  |
May 2018 Tax Reform Settlement Stipulation | Subsequent Event |  |  |  |  |  |  |  |  |  |
Idaho Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |  |
PublicUtilitiesRequestedRateremove cap of ADITC |  | $ (25,000) |  |  |  |  |  |  |  |
2023 Rate Case | Subsequent Event | Idaho Power Company |  |  |  |  |  |  |  |  |  |
Idaho Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  | 3,500 |  |  |  |  |  |  |  |
2023 Rate Case | Wildfire mitigation plan costs | Subsequent Event |  |  |  |  |  |  |  |  |  |
Idaho Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  | 26,700 |  |  |  |  |  |  |  |
2023 Rate Case | Benefit Obligations [Member] | Subsequent Event |  |  |  |  |  |  |  |  |  |
Idaho Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  | 18,000 |  |  |  |  |  |  |  |
Idaho PCA includes power supply and deferral balance. | Subsequent Event |  |  |  |  |  |  |  |  |  |
Idaho Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |  |
Approved Rate Increase (Decrease), Amount |  |  |  |  |  |  | $ 190,200 |  |  |
Idaho Jurisdiction Fixed Cost Adjustment | Subsequent Event |  |  |  |  |  |  |  |  |  |
Idaho Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  | $ 10,100 |  |  |  |  |  |  |
Settlement Stipulation - Investment Tax Credits and Idaho Sharing Mechanism |  |  |  |  |  |  |  |  |  |
Idaho Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount |  |  |  | 0 |  |  |  |  |  |
IDAHO | Jim Bridger Plant |  |  |  |  |  |  |  |  |  |
Idaho Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |  |
Approved Rate Increase (Decrease), Percentage | 1.50% |  |  |  |  |  |  |  |  |
Approved Rate Increase (Decrease), Amount | $ 18,800 |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount | $ 27,100 |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage | 2.10% |  |  |  |  |  |  |  |  |
IDAHO | May 2018 Tax Reform Settlement Stipulation |  |  |  |  |  |  |  |  |  |
Idaho Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage to be Shared with Customers |  |  |  |  |  |  |  |  |  | 80.00%
Percentage to be Shared with Entity |  |  |  |  |  |  |  |  |  | 20.00%
Authorized Return on Equity in Rate Case, Minimum |  |  |  |  |  |  |  |  |  | 9.40%
Amortization of Regulatory Asset |  |  |  | 7,400 |  |  |  |  |  |
Investment Tax Credits Maximum In One Year In Rate Case |  |  |  |  |  |  |  |  |  | $ 25,000
Authorized Return on Equity in Rate Case, Mid-point |  |  |  |  |  |  |  |  |  | 10.00%
Authorized Return on Equity in Rate Case, Maximum |  |  |  |  |  |  |  |  |  | 10.50%
IDAHO | May 2018 Tax Reform Settlement Stipulation | Annual recurring |  |  |  |  |  |  |  |  |  |
Idaho Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |  |
Approved Rate Increase (Decrease), Amount |  |  |  | $ (18,700) |  |  |  |  |  |
IDAHO | 2023 Rate Case |  |  |  |  |  |  |  |  |  |
Idaho Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage to be Shared with Customers |  |  |  |  |  |  |  |  |  | 80.00%
Percentage to be Shared with Entity |  |  |  |  |  |  |  |  |  | 20.00%
Authorized Energy Efficiency Rider Rate |  |  |  |  |  |  |  |  | 3.10% |
IDAHO | 2023 Rate Case | Subsequent Event |  |  |  |  |  |  |  |  |  |
Idaho Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |  |
Authorized Return on Equity in Rate Case, Minimum |  |  |  |  |  |  |  | 9.12% |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount |  | $ (54,700) |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage |  | 9.60% |  |  |  |  |  |  |  |
Authorized Return on Equity in Rate Case, Mid-point |  |  |  |  |  |  |  | 9.60% |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage |  | 4.25% |  |  |  |  |  |  |  |
Authorized Energy Efficiency Rider Rate |  |  |  |  |  |  |  | 2.35% |  |
IDAHO | 2023 Rate Case | Subsequent Event | Cost of Capital and Capital Structure |  |  |  |  |  |  |  |  |  |
Idaho Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |  |
Total Retail Rate Base |  |  |  |  |  |  |  | $ 3,800,000 |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage |  | 7.247% |  |  |  |  |  |  |  |
IDAHO | 2023 Rate Case | Idaho Power Cost Adjustment | Subsequent Event |  |  |  |  |  |  |  |  |  |
Idaho Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount |  | $ (168,300) |  |  |  |  |  |  |  |
IDAHO | Idaho PCA includes power supply and deferral balance. | Subsequent Event |  |  |  |  |  |  |  |  |  |
Idaho Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount |  | $ (484,900) |  |  |  |  |  |  |  |

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