Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Trading Arrangement: Trading Arrangement [Axis] Amortization of prior service cost Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Finance lease liabilities Finance Lease, Non-Current Liability Finance Lease, Non-Current Liability Statistical Measurement [Domain] Statistical Measurement [Domain] Accumulated provision for depreciation Public Utilities, Property, Plant and Equipment, Accumulated Depreciation Public Utilities, Property, Plant and Equipment, Accumulated Depreciation Title of 12(b) Security Title of 12(b) Security Carrying Amount Reported Value Measurement [Member] Subsequent Event Subsequent Event [Member] Document Fiscal Year Focus Document Fiscal Year Focus Derivative Liability, Fair Value, Gross Asset Derivative Liability, Subject to Master Netting Arrangement, Asset Offset PURPA and Non-PURPA Power Production [Axis] PURPA and Non-PURPA Power Production [Axis] PURPA and Non-PURPA Power Production Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Adjustment to Compensation, Amount Adjustment to Compensation Amount Financial Instrument [Axis] Financial Instrument [Axis] Customer [Axis] Customer [Axis] Common stock Common Stock, Value, Issued Interest Expense, Operating and Nonoperating Interest Expense, Operating and Nonoperating Tax withholdings on net settlements of share-based awards Tax withholdings on net settlements of share-based awards Payment, Tax Withholding, Share-Based Payment Arrangement Accrued compensation Employee-related Liabilities, Current ATM Forward Sale Agreements Maturity 3/31/27 ATM Forward Sale Agreements Maturity 3/31/27 [Member] ATM Forward Sale Agreements Maturity 3/31/27 Benefit Plans Retirement Benefits [Text Block] IERCo guarantee of BCC reclamation obligation Guarantor Obligations, Maximum Exposure, Undiscounted Restatement Determination Date Restatement Determination Date Availability future use [Domain] Availability future use [Domain] Availability future use [Domain] Changes in Retained Earnings [Table] Changes in Retained Earnings [Table] Changes in Retained Earnings [Table] Tax Jurisdiction of Domicile [Extensible Enumeration] Tax Jurisdiction of Domicile [Extensible Enumeration] Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Excess deferred income tax reversal Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Derivative Instrument [Axis] Derivative Instrument [Axis] Other Comprehensive Income (Loss) before Reclassifications, Tax Other Comprehensive Income (Loss) before Reclassifications, Tax Balance at beginning of period Balance at end of period Accounts Receivable, Allowance for Credit Loss Principal amount of debt securities and first mortgage bonds authorized by the IPUC, OPUC, and WPSC. Principal amount of debt securities and first mortgage bonds authorized by the IPUC, OPUC, and WPSC. Principal amount of debt securities and first mortgage bonds authorized by the IPUC, OPUC, and WPSC. Regulatory liabilities Regulatory Liability, Noncurrent Amendment Flag Amendment Flag Consolidated Entities [Axis] Consolidated Entities [Axis] Current Liabilities: Liabilities, Current [Abstract] Additions to the allowance Accounts Receivable, Credit Loss Expense (Reversal) Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Payments on finance lease liabilities Finance Lease, Principal Payments Allowance for equity funds used during construction Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity Disposal Group Classification [Axis] Disposal Group Classification [Axis] Proceeds from Contributed Capital Proceeds from Contributed Capital Initial Forward Sale Price, Per Share Initial Forward Sale Price, Per Share Initial Forward Sale Price, Per Share Consolidated Entities [Domain] Consolidated Entities [Domain] Forward Sale Agreements Settlement Date 5/28/26 (2025 Series) Forward Sale Agreements Settlement Date 5/28/26 (2025 Series) [Member] Forward Sale Agreements Settlement Date 5/28/26 (2025 Series) Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Utility plant in service Disposal Group, Including Discontinued Operation, Property, Plant, and Equipment Property, Plant, and Equipment [Abstract] Property, Plant, and Equipment [Abstract] Entity Address, State or Province Entity Address, State or Province Regulatory Matters Public Utilities Disclosure [Text Block] Segment Information [Abstract] Segment Information [Abstract] Segment Information [Abstract] PEO Total Compensation Amount PEO Total Compensation Amount Common Stock, Par or Stated Value Per Share Common Stock, Par or Stated Value Per Share Segment Reporting, Long-Lived Asset, Expenditure for Addition Segment Reporting, Long-Lived Asset, Expenditure for Addition Other Liabilities: Liabilities, Noncurrent [Abstract] 2025 2025 [Member] 2025 Net Periodic Benefit cost recognize in Other operations and maintenance NetServiceCostDefinedBenefitPlan Amount of service cost for defined benefit plan that is recognized in "Other operations and maintenance". Forward Sale Agreements (2025 Series) Forward Sale Agreements (2025 Series) [Member] Forward Sale Agreements (2025 Series) Weighted-average common shares outstanding - basic (in shares) Weighted-average common shares outstanding - basic Weighted Average Number of Shares Outstanding, Basic Registered Public Offering, Initial Common Shares Offered, Total Registered Public Offering, Initial Common Shares Offered, Total Registered Public Offering, Initial Common Shares Offered, Total Retirement Benefits [Abstract] Retirement Benefits [Abstract] Investments Long-Term Investments Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Forward Sale Agreement, Policy Forward Sale Agreement, Policy [Policy Text Block] Forward Sale Agreement, Policy Regulatory assets Regulatory Asset, Noncurrent Total current liabilities Total current liabilities Liabilities, Current Number of Reportable Segments Number of Reportable Segments Regulatory Liability [Axis] Regulatory Liability [Axis] At-the-Market Offering Program, Remaining Value Of Shares Available for Issuance, Gross Sales Price At-the-Market Offering Program, Remaining Value Of Shares Available for Issuance, Gross Sales Price At-the-Market Offering Program, Remaining Value Of Shares Available for Issuance, Gross Sales Price October 2025 Settlement Stipulation October 2025 Settlement Stipulation [Member] October 2025 Settlement Stipulation Other Unregulated Operating Revenue Schedule of Derivative Instruments Schedule of Derivative Instruments [Table Text Block] Entity Address, City or Town Entity Address, City or Town Restricted Stock Unit Awards to Employees Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Defined Benefit Plan Disclosure Defined Benefit Plan Disclosure [Line Items] Receivables [Abstract] Receivables [Abstract] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] nameplate capacity nameplate capacity nameplate capacity At-the-Market Offering Program, Executed Amount At-the-Market Offering Program, Executed Amount At-the-Market Offering Program, Executed Amount Document Information Document Information [Line Items] Disposal Group, Including Discontinued Operation, Assets Disposal Group, Including Discontinued Operation, Assets Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Dividend Distribution Restriction Threshold Dividend Distribution Restriction Threshold The threshold below which the entity will not pay any dividends to the parent company that would reduce the entity's common equity capital, without obtaining regulatory approval. Class of Stock [Axis] Class of Stock [Axis] Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Common Shares To Deliver To Settle Forward Sales Agreement, Gross Common Shares To Deliver To Settle Forward Sales Agreement, Gross Common Shares To Deliver To Settle Forward Sales Agreement, Gross Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Nonoperating (Income) Expense: Nonoperating Income (Expense) [Abstract] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Wildfire Mitigation Plan Deferral Wildfire Mitigation Plan Deferral [Member] Wildfire Mitigation Plan Deferral Current maturities of long-term debt Long-Term Debt, Current Maturities IDACORP Parent Company [Member] Deferred revenue-AFUDC Deferred revenue-AFUDC [Member] Deferred revenue related to allowance for funds used during construction Investment Tax Credits, Remains Available Investment Tax Credits, Remains Available Investment Tax Credits, Remains Available Subsequent Event Type [Axis] Subsequent Event Type [Axis] Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Earnings Per Share, Policy Earnings Per Share, Policy [Policy Text Block] Registered Public Offering, Initial Common Shares Offered, Greenshoe Registered Public Offering, Initial Common Shares Offered, Greenshoe Registered Public Offering, Initial Common Shares Offered, Greenshoe Additions to property, plant, and equipment in accounts payable Additions to utility plant in accounts payable Capital Expenditures Incurred but Not yet Paid Segment Reporting Segment Reporting [Table Text Block] Noncontrolling Interests Noncontrolling Interest [Member] Management Estimates Use of Estimates, Policy [Policy Text Block] Impairment of Long-Lived Assets to be Disposed of Impairment of Long-Lived Assets to be Disposed of Related Party [Axis] Related and Nonrelated Parties [Axis] Unfunded pension liability adjustment, tax Unfunded pension liability adjustment, tax Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax Electric utility revenues Electric utility revenues Regulated Operating Revenue, Electric, Non-Nuclear Capital Addition Purchase Commitments Capital Addition Purchase Commitments [Member] Notes Receivable Notes Receivable, Fair Value Disclosure Guarantor Obligations Guarantor Obligations [Line Items] Contingencies Contingencies Disclosure [Text Block] Non-cash investing and financing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Taxes accrued/receivable Increase (Decrease) in Income Taxes Payable Document Period End Date Document Period End Date Change in: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Idaho fixed cost adjustment mechanism Idaho Fixed Cost Adjustment Netting [Member] Annual Idaho Fixed Cost Adjustment Filing [Member] Shareholders' equity Shareholders' equity [Line Items] Shareholders' equity [Line Items] Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Total liabilities held for sale Disposal Group, Including Discontinued Operation, Liabilities, Current Preferred Stock, Shares Outstanding Preferred Stock, Shares Outstanding Secured Long-term Debt, Noncurrent Debt Instrument, Face Amount Regulatory Asset Regulatory Asset Security Exchange Name Security Exchange Name PURPA and Non-PURPA Power Production PURPA and Non-PURPA Power Production [Member] PURPA and Non-PURPA Power Production Eliminations Consolidation, Eliminations [Member] Position Position [Axis] ATM Forward Sale Agreements Maturity 5/28/27 1 ATM Forward Sale Agreements Maturity 5/28/27 1 [Member] ATM Forward Sale Agreements Maturity 5/28/27 1 Public Utilities, Rate Matters [Abstract] Public Utilities, Rate Matters [Abstract] Tax benefit Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Consolidation Items [Domain] Consolidation Items [Domain] Other Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Changes in Retained Earnings [Line Items] Changes in Retained Earnings [Line Items] Changes in Retained Earnings [Line Items] Accounts Receivable, Allowance for Credit Loss [Table Text Block] Accounts Receivable, Allowance for Credit Loss [Table Text Block] Interest accrued Interest Payable, Current Segment Reporting Segment Reporting, Policy [Policy Text Block] Finance lease right-of-use assets Finance Lease, Right-of-Use Asset, after Accumulated Amortization Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Termination Of Contracts To Acquire And Own Wind Facility and Wind Power [Domain] Termination Of Contracts To Acquire And Own Wind Facility and Wind Energy [Domain] Termination Of Contracts To Acquire And Own Wind Facility and Wind Energy [Domain] Registered Public Offering, Initial Common Shares Offered Registered Public Offering, Initial Common Shares Offered Registered Public Offering, Initial Common Shares Offered Earnings Per Share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Earnings Per Share of Common Stock: Earnings Per Share [Abstract] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] ATM Forward Sale Agreements Maturity 3/31/27 2 ATM Forward Sale Agreements Maturity 3/31/27 2 [Member] ATM Forward Sale Agreements Maturity 3/31/27 2 Document Fiscal Period Focus Document Fiscal Period Focus Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Trading Symbol Trading Symbol Regulation of Utility Operations Public Utilities, Policy [Policy Text Block] Depreciation and amortization Utilities Operating Expense, Depreciation and Amortization Additions to property, plant and equipment, net Additions to utility plant, net Payments to Acquire Property, Plant, and Equipment Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Purchased power Utilities Operating Expense, Purchased Power Public Utilities, Approved Rate Increase (Decrease), Amount Public Utilities, Approved Rate Increase (Decrease), Amount Total electric utility operating expenses Utilities Operating Expense Company Selected Measure Name Company Selected Measure Name Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Pension and postretirement benefit plan expense Pension and Other Postretirement Benefits Cost (Reversal of Cost) Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value Financial Swaps Energy Related Derivative [Member] Regulatory Matters Disclosures Regulated Operation, Regulatory Asset [Table] Accumulated Defined Benefit Pension Items Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Bridger Coal Company Bridger Coal Company [Member] Bridger Coal Company [Member] Corporate Fixed-Income And Asset-Backed Debt Securities Corporate Fixed-Income And Asset-Backed Debt Securities [Member] Corporate Fixed-Income And Asset-Backed Debt Securities Operating Activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Weighted-average common shares outstanding - diluted (in shares) Weighted-average common shares outstanding - diluted Weighted Average Number of Shares Outstanding, Diluted Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Entity Emerging Growth Company Entity Emerging Growth Company Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Rate Case Matter [Axis] Rate Case Matter [Axis] Rate Case Matter [Axis] Pension and other postretirement benefits Liability, Defined Benefit Plan, Noncurrent Disposal Group Name [Domain] Disposal Group Name [Domain] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Dividends Dividends Other property, net of accumulated depreciation Property, Plant, and Equipment, Other, before Accumulated Depreciation Deferred income taxes and investment tax credits Deferred Income Taxes and Tax Credits Property, plant, and equipment - net Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization DERIVATIVE FINANCIAL INSTRUMENTS Derivative Instruments and Hedging Activities Disclosure [Text Block] Regulatory Asset [Axis] Regulatory Asset [Axis] Disposal Groups, Including Discontinued Operations Disposal Groups, Including Discontinued Operations [Table Text Block] Derivative Liability, Fair Value, Gross Liability Derivative Liability, Subject to Master Netting Arrangement, before Offset Schedule of Forward Contracts Indexed to Issuer's Equity, Settled Schedule of Forward Contracts Indexed to Issuer's Equity, Settled [Table Text Block] Schedule of Forward Contracts Indexed to Issuer's Equity, Settled Total other assets Assets, Noncurrent, Other than Noncurrent Investments and Property, Plant and Equipment Defined Benefit Plan, Contributions by Employer Defined Benefit Plan, Plan Assets, Contributions by Employer Statutory Accounting Practices, Jurisdiction [Domain] Statutory Accounting Practice, Jurisdiction [Domain] Revenue from Contract with Customer [Abstract] Other Other Receivables Cash To Be Received On Settlement Of Forward Sale Agreement Cash To Be Received On Settlement Of Forward Sale Agreement Cash To Be Received On Settlement Of Forward Sale Agreement ATM Forward Sale Agreements Maturity 3/31/27 1 [Member] ATM Forward Sale Agreements Maturity 3/31/27 1 [Member] ATM Forward Sale Agreements Maturity 3/31/27 1 Registered Public Offering, Price Per Share Registered Public Offering, Price Per Share Registered Public Offering, Price Per Share Derivative Instrument Detail [Abstract] Derivative Instrument Detail [Abstract] Award Timing Predetermined Award Timing Predetermined [Flag] Utility plant in service - net Public Utilities, Property, Plant and Equipment, Net Other Comprehensive Income: Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Share-based compensation expense APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Derivative revenues Derivative revenues netting [Member] Derivative revenues [Member] Effective tax rate Effective Income Tax Rate Reconciliation, Percent Fair Value of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Current regulatory liabilities Disposal Group, Including Discontinued Operation, Current Regulatory Liabilities Disposal Group, Including Discontinued Operation, Current Regulatory Liabilities Effect of dilutive securities Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements All Executive Categories All Executive Categories [Member] ATM Forward Sale Agreements Maturity 12/3/27 ATM Forward Sale Agreements Maturity 12/3/27 [Member] ATM Forward Sale Agreements Maturity 12/3/27 Allowance for Doubtful Other Receivables, Current Allowance for Credit Loss, Receivable, Other, Current Regulated Operating Revenue Regulated Operating Revenue [Abstract] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Depreciation Depreciation Scenario [Domain] Scenario [Domain] Income tax expense before additional ADITC amortization Income tax expense before additional ADITC amortization Income tax expense before additional ADITC amortization PURPA and Non-PURPA Power Production [Domain] PURPA and Non-PURPA Power Production [Domain] PURPA and Non-PURPA Power Production [Domain] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Net Periodic Benefit cost recognized in other expense, net otherexpensedefinedbenefitplanbenefitcost Amount of net periodic benefit cost excluding service cost for defined benefit plans that is recorded as "Other Expense, Net". Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Oregon Power Cost Adjustment Wildfire Oregon Power Cost Adjustment Wildfire [Member] Oregon Power Cost Adjustment Wildfire Share Recipient [Axis] Share Recipient [Axis] Share Recipient SEGMENT INFORMATION Segment Reporting [Text Block] Directors Directors [Member] Directors Dividends on common stock Payments of Ordinary Dividends, Common Stock Expiration Date Trading Arrangement Expiration Date Current regulatory assets Disposal Group, Including Discontinued Operation, Current Regulatory Assets Disposal Group, Including Discontinued Operation, Current Regulatory Assets Regulatory deferral of net periodic benefit cost Defined Benefit Plan Regulatory Adjustments Deferred The difference between the period's pension costs calculated for GAAP and ratemaking purposes, which is deferred as a regulatory adjustment. Disaggregation of Revenue [Table Text Block] Disaggregation of Revenue [Table Text Block] Denominator: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Requested Year [Axis] Requested Year [Axis] Requested Year Income Statement Location Location, Statement of Income, Balance [Axis] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Money market funds Cash and Cash Equivalents, Fair Value Disclosure Total equity Beginning balance Ending balance Equity, Including Portion Attributable to Noncontrolling Interest Public Utilities, Regulatory Proceeding [Domain] Public Utilities, Regulatory Proceeding [Domain] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Derivatives, Methods of Accounting, Derivatives Not Designated or Qualifying as Hedges Derivatives, Methods of Accounting, Derivatives Not Designated or Qualifying as Hedges [Policy Text Block] Accrued unbilled revenues Unbilled Receivables, Current Assets Held for Sale Disclosure [Line Items] Disposal Group, Including Discontinued Operations [Line Items] Public Utilities, Requested Rate Increase (Decrease), Amount Public Utilities, Requested Rate Increase (Decrease), Amount Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Derivative [Table] Derivative [Table] General Discussion of Derivative Instruments and Hedging Activities [Abstract] General Discussion of Derivative Instruments and Hedging Activities [Abstract] Issuance of Common Stock Proceeds from Issuance of Common Stock IPUC authorized AFUDC Collection HCC Relicensing - Gross IPUC authorized AFUDC Collection HCC Relicensing - Gross [Member] IPUC authorized AFUDC Collection HCC Relicensing - Gross Common Stock, Shares Authorized Common Stock, Shares Authorized Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Exercise Price Award Exercise Price Investing Activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Segment Reporting Segment Reporting [Line Items] Share Recipient [Domain] Share Recipient [Domain] Share Recipient [Domain] Income Tax Expense [Line Items] Income Tax Expense [Line Items] Income Tax Expense [Line Items] Document Quarterly Report Document Quarterly Report Long-Term Purchase Commitment, Period Long-Term Purchase Commitment, Period Regulatory liabilities Disposal Group, Including Discontinued Operation, Long-Term Regulatory Liabilities Disposal Group, Including Discontinued Operation, Long-Term Regulatory Liabilities Assets Held for Sale [Table] Disposal Groups, Including Discontinued Operations [Table] Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Segments [Domain] Segments [Domain] Commercial Retail Revenue Commercial Retail Revenue [Member] Commercial Retail Revenue [Member] Common Stock Including Additional Paid in Capital Common Stock Including Additional Paid in Capital [Member] Irrigation Retail Revenue Irrigation Retail Revenue [Member] Irrigation Retail Revenue [Member] Minimum authorized return on equity Authorized Return on Equity in Rate Case, Minimum The minimum authorized return on equity, whether requested or approved, in the rate case. Scenario [Axis] Scenario [Axis] Retirement of long-term debt Repayments of Long-Term Debt Disposal Group Classification [Domain] Disposal Group Classification [Domain] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Dividend Distribution Restriction Amount Dividend Distribution Restriction Amount The maximum amount of dividends that can by paid out by the entity, as allowed by credit facility covenant. Loss Contingency [Abstract] Loss Contingency [Abstract] Equity Component [Domain] Equity Component [Domain] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Income Tax Expense [Table] Income Tax Expense [Table] An analysis of income tax expense for the period. Adoption Date Trading Arrangement Adoption Date Consideration Disposal Group, Including Discontinued Operation, Consideration Debt Instrument, Interest Rate, Stated Percentage Debt Instrument, Interest Rate, Stated Percentage Common stock dividends Dividends, Common Stock, Cash Total IDACORP, Inc. shareholders’ equity Total IDACORP, Inc. shareholders’ equity Balance at beginning of period Balance at end of period Equity, Attributable to Parent Total nonoperating expense, net Nonoperating Income (Expense) Pollution Control Bond 1.70 Due 2026 Pollution Control Bond 1.70 Due 2026 [Member] Pollution Control Bond 1.70 Due 2026 Equity Securities, FV-NI Equity Securities, FV-NI, Current Regulatory Agency [Axis] Regulatory Agency [Axis] Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Accounting Policies [Abstract] Accounting Policies [Abstract] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Insider Trading Policies and Procedures [Line Items] Held-to-maturity securities Debt Securities, Held-to-Maturity, Fair Value Fuel stock (at average cost) Energy Related Inventory, Other Fossil Fuel Regulatory assets Disposal Group, Including Discontinued Operation, Long-Term Regulatory Assets Disposal Group, Including Discontinued Operation, Long-Term Regulatory Assets Regulatory Agency [Domain] Regulatory Agency [Domain] Regulatory jurisdiction [Axis] Regulatory jurisdiction [Axis] Regulatory jurisdiction [Axis] Forward Sale Agreements Settlement Date 5/28/26 1 (2025 Series) Forward Sale Agreements Settlement Date 7/13/26 (2025 Series) [Member] Forward Sale Agreements Settlement Date 7/13/26 (2025 Series) Accounts Receivable, Allowance for Credit Loss, Current Accounts Receivable, Allowance for Credit Loss, Current Other Proceeds from (Payment for) Other Financing Activity Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Cash (refunded) paid for income taxes Proceeds from Income Tax Refunds Performance Shares Performance Shares [Member] Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Current regulatory assets Regulatory Asset, Current Schedule of ATM Forward Contracts Indexed to Issuer's Equity, Settled Schedule of ATM Forward Contracts Indexed to Issuer's Equity, Settled [Table Text Block] Schedule of ATM Forward Contracts Indexed to Issuer's Equity, Settled Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Utility plant held for future use Plant Held for Future Use Amount Construction work in progress Construction in Progress, Gross Number of Operating Segments Number of Operating Segments Entity Central Index Key Entity Central Index Key Premium on capital stock Additional Paid in Capital, Common Stock All Adjustments to Compensation All Adjustments to Compensation [Member] Schedule of Guarantor Obligations [Table] Guarantor Obligation [Table] Equity [Abstract] Equity [Abstract] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Income Tax Income Tax, Policy [Policy Text Block] CHANGES IN IDAHO POWER RETAINED EARNINGS ChangesinIdahoPowerRetainedEarnings [Text Block] ChangesinIdahoPowerRetainedEarnings [Text Block] Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Other Stockholders' Equity, Other Disposal Group, Including Discontinued Operation, Liabilities Disposal Group, Including Discontinued Operation, Liabilities Income Statement [Abstract] Income Statement [Abstract] Document Transition Report Document Transition Report Alternative revenue programs and other revenues [Table Text Block] Alternative revenue programs and other revenues [Table Text Block] Alternative revenue programs and other revenues [Table Text Block] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Changes in Idaho Power Retained Earnings [Abstract] Changes in Idaho Power Retained Earnings [Abstract] Changes in Idaho Power Retained Earnings [Abstract] Operating Expenses [Abstract] Operating Expenses [Abstract] Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Allowance for borrowed funds used during construction Interest Costs Capitalized Adjustment City Area Code City Area Code Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Document Information [Table] Document Information [Table] All Individuals All Individuals [Member] Long-term debt Debt Instrument, Fair Value Disclosure Jurisdiction [Axis] Statutory Accounting Practice, Jurisdiction [Axis] Percentage cap on the FCA adjustment Percentage cap on the FCA adjustment Percentage cap on the FCA adjustment. Derivatives, Reporting of Derivative Activity Derivatives, Reporting of Derivative Activity [Policy Text Block] Name Forgone Recovery, Individual Name Retail revenues Retail revenues [Member] Retail revenues [Member] Commitments and Contingencies, Policy Commitments and Contingencies, Policy [Policy Text Block] Regulatory Liability [Domain] Regulatory Liability [Domain] Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Statement [Line Items] Statement [Line Items] Total assets Total assets Assets Schedule of Defined Benefit Plans Disclosures [Table] Defined Benefit Plan [Table] Entity [Domain] Entity [Domain] Registered Public Offering, Executed Amount, Greenshoe Registered Public Offering, Executed Amount, Greenshoe Registered Public Offering, Executed Amount, Greenshoe Amortization of prior service cost Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Operating Segments Operating Segments [Member] Subsidiary of Common Parent Subsidiary of Common Parent [Member] Annual amortization cap Public Utilities, Annual Amortization Cap, Value Public Utilities, Annual Amortization Cap, Value Long-Term Purchase Commitment, Category of Item Purchased Long-Term Purchase Commitment, Category of Item Purchased [Domain] Energy Energy [Domain] Stock Issued During Period, Shares, New Issues Stock Issued During Period, Shares, New Issues Schedule of common stock issued during period [Table] Schedule of common stock issued during period [Table] Schedule of common stock issued during period [Table] Nature of Business Nature of Operations [Text Block] PEO PEO [Member] At-the-Market Offering Program (2024 Series) At-the-Market Offering Program (2024 Series) [Member] At-the-Market Offering Program (2024 Series) Incremental Common Shares Attributable to Dilutive Effect of Equity Forward Agreements Incremental Common Shares Attributable to Dilutive Effect of Equity Forward Agreements Measurement Basis [Axis] Measurement Basis [Axis] Derivative Asset, Fair Value, Gross Liability Derivative Asset, Subject to Master Netting Arrangement, Liability Offset At-the-Market Offering Program (2026 Series) At-the-Market Offering Program (2026 Series) [Member] At-the-Market Offering Program (2026 Series) Other Other Liabilities, Noncurrent Retirement Plan Type [Axis] Retirement Plan Type [Axis] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Subsequent Event Type [Domain] Subsequent Event Type [Domain] Long-Term Contract for Purchase of Wind generation Long-Term Contract for Purchase of Wind generation [Member] Long-Term Contract for Purchase of Wind generation Retained Earnings Retained Earnings [Member] Taxes accrued Taxes Payable, Current Maximum leverage ratio requirement Maximum leverage ratio requirement Maximum aggregate indebtedness divided by net capital, as allowed by credit facility covenant. Total operating expenses Operating Expenses Allowance for equity funds used during construction Public Utilities, Allowance for Funds Used During Construction, Additions Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Award Timing Disclosures [Line Items] Fair Value, by Balance Sheet Grouping [Table Text Block] Fair Value, by Balance Sheet Grouping [Table Text Block] Earnings attributable to IDACORP, Inc. - diluted (in dollars per share) Earnings Per Share, Diluted Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Entity Current Reporting Status Entity Current Reporting Status Net cash provided by financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Tax withholdings on net settlements of share-based awards Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation ATM Forward Sale Agreements Maturity 5/28/27 ATM Forward Sale Agreements Maturity 5/28/27 [Member] ATM Forward Sale Agreements Maturity 5/28/27 Natural Gas (MMBTU) Fuel [Member] Retained Earnings Roll Forward [Roll Forward] Retained Earnings Roll Forward [Roll Forward] Retained Earnings Roll Forward Other operations and maintenance Utilities Operating Expense, Maintenance and Operations Adjustments to reconcile net income to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Write-offs, net of recoveries Accounts Receivable, Allowance for Credit Loss, Writeoff Schedule of Forward Contracts Indexed to Issuer's Equity Schedule of Forward Contracts Indexed to Issuer's Equity [Table Text Block] Long-Term Purchase Commitment Long-Term Purchase Commitment [Line Items] Revenue from contracts with customers Revenue from Contract with Customer, Excluding Assessed Tax Financing Activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Additional Collateral, Aggregate Fair Value Additional Collateral, Aggregate Fair Value Other Interest and Dividend Income Other Interest and Dividend Income Interest cost Defined Benefit Plan, Interest Cost Financial Instruments [Domain] Financial Instruments [Domain] Idaho Power Company Idaho Power Company [Member] Idaho Power Company [Member] Total assets held for sale Disposal Group, Including Discontinued Operation, Assets, Current Idaho Power Cost Adjustment Idaho Power Cost Adjustment [Member] Idaho Power Cost Adjustment Derivative Assets Derivative Asset Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Underlying Securities Award Underlying Securities Amount Construction work in progress Disposal Group, Including Discontinued Operation, Construction Work in Progress Disposal Group, Including Discontinued Operation, Construction Work in Progress Comprehensive income attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Estimated Fair Value Estimate of Fair Value Measurement [Member] REVENUES: Revenue from Contract with Customer [Text Block] Stock Issued During Period, Value, New Issues Stock Issued During Period, Value, New Issues Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Power cost adjustment Power cost adjustment expense (deferral) An adjustment to net power supply costs (Purchased Power and Fuel less Off-system sales) listed to defer/accrue them for amounts that will be collected from/returned to customers in the future, and to recognize previously deferred/accrued net power supply costs to match with amounts now collected from/returned to customers. 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Long-Term Power Production (including PURPA) Purchase Commitment Long-Term Power Production (including PURPA) Purchase Commitment [Member] Long-Term Power Production (including PURPA) Purchase Commitment Proceeds from Sale of Other Productive Assets Proceeds from Sale of Other Productive Assets Long-Term Contract for Purchase of Gas Transportation Capacity Long-Term Contract for Purchase of Gas Transportation Capacity [Member] Long-Term Contract for Purchase of Gas Transportation Capacity Derivative Contract [Domain] Derivative Contract [Domain] Equity Awards Adjustments Equity Awards Adjustments [Member] Energy efficiency programs Energy efficiency programs This balance represents costs expended on energy efficiency programs. Total Liabilities and Equity Regulatory Asset [Domain] Regulatory Asset [Domain] Employee Stock Option Share-Based Payment Arrangement, Option [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Electricity (MWh) Electricity [Member] Noncontrolling interests Equity, Attributable to Noncontrolling Interest Segments [Axis] Segments [Axis] Senior Management Security Plan Supplemental Employee Retirement Plan [Member] Company-owned life insurance Life Insurance, Corporate or Bank Owned, Amount Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Related Party [Domain] Related and Nonrelated Parties [Domain] No Trading Symbol Flag No Trading Symbol Flag Tabular List, Table Tabular List [Table Text Block] Indenture, Limit of first mortgate bonds at any one time outstanding Indenture, Limit of first mortgate bonds at any one time outstanding Maximum amount of first mortgage bonds that could be issued under Idaho Power's Indenture of Mortgage and Deed of Trust, as of the balance sheet date. 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This is impacted by timing of cash contributions to plan. 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Discontinued Operations and Disposal Groups [Abstract] Name Measure Name Income Taxes Income Tax Disclosure [Text Block] Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Other Operating Segment Other Operating Segment [Member] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Other non-cash adjustments to net income, net Other non-cash adjustments to net income, net Other Noncash Income (Expense) COMMITMENTS Commitments Disclosure [Text Block] Reclassification out of Accumulated Other Comprehensive Income Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax [Abstract] Debt Instrument [Line Items] Debt Instrument [Line Items] Prepayments Increase (Decrease) in Other Current Assets Entity Information, Former Legal or Registered Name Entity Information, Former Legal or Registered Name Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Retirement Benefits, Description [Abstract] Retirement Benefits, Description [Abstract] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Transmission Service Agreement Transmission services (wheeling) [Member] Transmission services (wheeling) [Member] Entity Filer Category Entity Filer Category Proceeds from Sale of Intangible Assets Proceeds from Sale of Intangible Assets Changes in Idaho Power Retained Earnings Table ChangesinIdahoPowerRetainedEarningsTable [Table Text Block] ChangesinIdahoPowerRetainedEarnings Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and Cash Equivalent Oregon jurisdiction Oregon jurisdiction [Member] Oregon jurisdiction Position Position [Domain] Derivative, by Nature Energy [Axis] Company Selected Measure Amount Company Selected Measure Amount Distributions from equity-method investments Proceeds from Equity Method Investment, Distribution Depreciation and amortization Depreciation, Depletion and Amortization Debt instrument interest rate limit Debt instrument interest rate limit Debt security and first mortgage bond maximum interest rate limit imposed by the OPUC. 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Net Income Attributable to IDACORP, Inc. Net Income Attributable to IDACORP, Inc. Net Income (Loss) Attributable to Parent Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table Text Block] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Balance Sheet Location [Axis] Location, Statement of Financial Position, Balance [Axis] Statement [Table] Statement [Table] IDAHO IDAHO Restatement Determination Date: Restatement Determination Date [Axis] Current regulatory liabilities Regulatory Liability, Current Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Alternative revenue programs and other revenues Regulated Operating Revenue (Expense), Other, Net Regulated Operating Revenue (Expense), Other, Net Total other liabilities Liabilities, Other than Long-Term Debt, Noncurrent Receivables: Receivables, Net, Current [Abstract] Total operating revenues Total operating revenues Regulated and Unregulated Operating Revenue Derivative Asset, Fair Value, Gross Asset Derivative Asset, Subject to Master Netting Arrangement, before Offset Operating Revenues: Revenues [Abstract] Collateral Already Posted, Aggregate Fair Value Collateral Already Posted, Aggregate Fair Value Category of Item Purchased [Axis] Category of Item Purchased [Axis] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] UNITED STATES