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EFFECTS OF REGULATION - Regulatory Asset (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Regulatory Asset [Line Items] |  |
Total Current Regulatory Assets | $ 445.9 | $ 514.0
Total Noncurrent Regulatory Assets | 5,129.2 | 5,092.4
Regulatory Liabilities and Deferred Investment Tax Credits | 8,344.0 | 8,182.4
PUBLIC SERVICE COMPANY OF OKLAHOMA |  |
Regulatory Asset [Line Items] |  |
Total Current Regulatory Assets | 64.7 | 118.3
Total Noncurrent Regulatory Assets | 527.8 | 522.7
Regulatory Liabilities and Deferred Investment Tax Credits | 689.7 | 765.6
Pending final regulatory approval |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 1,310.8 | 837.3
Approved for recovery |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 3,818.4 | 4,255.1
Approved for recovery | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 497.5 | 434.0
Earns/earning a return | Under-recovered Fuel Costs |  |
Regulatory Asset [Line Items] |  |
Total Current Regulatory Assets | $ 245.7 | 357.4
Remaining Recovery Period | 1 year |
Earns/earning a return | Under-recovered Fuel Costs | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |
Regulatory Asset [Line Items] |  |
Total Current Regulatory Assets | $ 64.7 | 118.3
Remaining Recovery Period | 1 year |
Earns/earning a return | Unrecovered Winter Storm Fuel Costs |  |
Regulatory Asset [Line Items] |  |
Total Current Regulatory Assets | $ 84.2 | 93.9
Remaining Recovery Period | 1 year |
Earns/earning a return | Pending final regulatory approval |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 395.1 | 349.9
Earns/earning a return | Pending final regulatory approval | Unrecovered Winter Storm Fuel Costs |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 33.5 | 60.1
Earns/earning a return | Pending final regulatory approval | Welsh Plant, Units 1 and 3 Accelerated Depreciation |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 168.6 | 125.6
Earns/earning a return | Pending final regulatory approval | Pirkey Plant Accelerated Depreciation |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 121.3 | 114.4
Earns/earning a return | Pending final regulatory approval | Storm-Related Costs |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 51.0 | 0.0
Earns/earning a return | Pending final regulatory approval | Other Regulatory Assets Pending Final Regulatory Approval |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 20.7 | 49.8
Earns/earning a return | Approved for recovery |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 1,711.5 | 1,946.9
Earns/earning a return | Approved for recovery | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 425.4 | 325.3
Earns/earning a return | Approved for recovery | Unrecovered Winter Storm Fuel Costs |  |
Regulatory Asset [Line Items] |  |
Remaining Recovery Period | 3 years |
Total Noncurrent Regulatory Assets | $ 62.8 | 99.3
Earns/earning a return | Approved for recovery | Storm-Related Costs |  |
Regulatory Asset [Line Items] |  |
Remaining Recovery Period | 7 years |
Total Noncurrent Regulatory Assets | $ 106.7 | 170.9
Earns/earning a return | Approved for recovery | Storm-Related Costs | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |
Regulatory Asset [Line Items] |  |
Remaining Recovery Period | 7 years |
Total Noncurrent Regulatory Assets | $ 106.7 | 26.2
Earns/earning a return | Approved for recovery | Plant Retirement Costs - Asset Retirement Obligation Costs |  |
Regulatory Asset [Line Items] |  |
Remaining Recovery Period | 16 years |
Total Noncurrent Regulatory Assets | $ 111.0 | 110.8
Earns/earning a return | Approved for recovery | Plant Retirement Costs - Unrecovered Plant |  |
Regulatory Asset [Line Items] |  |
Remaining Recovery Period | 22 years |
Total Noncurrent Regulatory Assets | $ 661.2 | 664.2
Earns/earning a return | Approved for recovery | Plant Retirement Costs - Unrecovered Plant | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |
Regulatory Asset [Line Items] |  |
Remaining Recovery Period | 22 years |
Total Noncurrent Regulatory Assets | $ 274.0 | 254.1
Earns/earning a return | Approved for recovery | Long-term Under-recovered Fuel Costs - West Virginia |  |
Regulatory Asset [Line Items] |  |
Remaining Recovery Period | 10 years |
Total Noncurrent Regulatory Assets | $ 283.8 | 291.5
Earns/earning a return | Approved for recovery | Fuel Mine Closure Costs - Texas |  |
Regulatory Asset [Line Items] |  |
Remaining Recovery Period | 11 years |
Total Noncurrent Regulatory Assets | $ 70.6 | 74.3
Earns/earning a return | Approved for recovery | Pirkey Plant Accelerated Depreciation - Louisiana |  |
Regulatory Asset [Line Items] |  |
Remaining Recovery Period | 8 years |
Total Noncurrent Regulatory Assets | $ 66.4 | 65.8
Earns/earning a return | Approved for recovery | Kentucky Deferred Purchased Power Expenses |  |
Regulatory Asset [Line Items] |  |
Remaining Recovery Period | 3 years |
Total Noncurrent Regulatory Assets | $ 45.0 | 43.5
Earns/earning a return | Approved for recovery | Rockport Plant Dry Sorbent Injection System and Selective Catalytic Reduction |  |
Regulatory Asset [Line Items] |  |
Remaining Recovery Period | 4 years |
Total Noncurrent Regulatory Assets | $ 37.3 | 46.9
Earns/earning a return | Approved for recovery | Texas Mobile Temporary Emergency Electric Energy Facilities Rider |  |
Regulatory Asset [Line Items] |  |
Remaining Recovery Period | 2 years |
Total Noncurrent Regulatory Assets | $ 32.6 | 33.4
Earns/earning a return | Approved for recovery | Environmental Control Projects |  |
Regulatory Asset [Line Items] |  |
Remaining Recovery Period | 16 years |
Total Noncurrent Regulatory Assets | $ 29.1 | 31.4
Earns/earning a return | Approved for recovery | Environmental Control Projects | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |
Regulatory Asset [Line Items] |  |
Remaining Recovery Period | 16 years |
Total Noncurrent Regulatory Assets | $ 21.2 | 22.5
Earns/earning a return | Approved for recovery | Ohio Basic Transmission Cost Rider |  |
Regulatory Asset [Line Items] |  |
Remaining Recovery Period | 2 years |
Total Noncurrent Regulatory Assets | $ 26.1 | 42.2
Earns/earning a return | Approved for recovery | Plant Retirement Costs - Unrecovered Plant, Dolet Hills Power Station, Louisiana |  |
Regulatory Asset [Line Items] |  |
Remaining Recovery Period | 8 years |
Total Noncurrent Regulatory Assets | $ 19.0 | 40.8
Earns/earning a return | Approved for recovery | Long-term Under-recovered Fuel Costs - Virginia |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 0.0 | 107.0
Earns/earning a return | Approved for recovery | Other Regulatory Assets Approved for Recovery |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 159.9 | 124.9
Earns/earning a return | Approved for recovery | Other Regulatory Assets Approved for Recovery | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 13.4 | 8.4
Does not earns/earning a return | Under-recovered Fuel Costs |  |
Regulatory Asset [Line Items] |  |
Total Current Regulatory Assets | $ 116.0 | 62.7
Remaining Recovery Period | 1 year |
Does not earns/earning a return | Pending final regulatory approval |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 915.7 | 487.4
Does not earns/earning a return | Pending final regulatory approval | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 30.3 | 88.7
Does not earns/earning a return | Pending final regulatory approval | Storm-Related Costs |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 300.8 | 408.9
Does not earns/earning a return | Pending final regulatory approval | Storm-Related Costs | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 4.9 | 88.5
Does not earns/earning a return | Pending final regulatory approval | Other Regulatory Assets Pending Final Regulatory Approval |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 86.3 | 52.6
Does not earns/earning a return | Pending final regulatory approval | Other Regulatory Assets Pending Final Regulatory Approval | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 9.0 | 0.2
Does not earns/earning a return | Pending final regulatory approval | Plant Retirement Costs - Asset Retirement Obligation Costs |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 357.4 | 25.9
Does not earns/earning a return | Pending final regulatory approval | NOLC - Costs |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 92.8 | 0.0
Does not earns/earning a return | Pending final regulatory approval | 2024-2025 Virginia Under-Earnings |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 78.4 | 0.0
Does not earns/earning a return | Approved for recovery |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 2,106.9 | 2,308.2
Does not earns/earning a return | Approved for recovery | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 72.1 | 108.7
Does not earns/earning a return | Approved for recovery | Storm-Related Costs |  |
Regulatory Asset [Line Items] |  |
Remaining Recovery Period | 7 years |
Total Noncurrent Regulatory Assets | $ 66.5 | 38.5
Does not earns/earning a return | Approved for recovery | Plant Retirement Costs - Asset Retirement Obligation Costs |  |
Regulatory Asset [Line Items] |  |
Remaining Recovery Period | 18 years |
Total Noncurrent Regulatory Assets | $ 360.1 | 330.2
Does not earns/earning a return | Approved for recovery | Other Regulatory Assets Approved for Recovery |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 240.1 | 269.1
Does not earns/earning a return | Approved for recovery | Other Regulatory Assets Approved for Recovery | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 10.6 | 16.2
Does not earns/earning a return | Approved for recovery | Pension and OPEB Funded Status |  |
Regulatory Asset [Line Items] |  |
Remaining Recovery Period | 12 years |
Total Noncurrent Regulatory Assets | $ 974.2 | 1,054.1
Does not earns/earning a return | Approved for recovery | Pension and OPEB Funded Status | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |
Regulatory Asset [Line Items] |  |
Remaining Recovery Period | 12 years |
Total Noncurrent Regulatory Assets | $ 57.6 | 62.6
Does not earns/earning a return | Approved for recovery | Unamortized Loss on Reacquired Debt |  |
Regulatory Asset [Line Items] |  |
Remaining Recovery Period | 24 years |
Total Noncurrent Regulatory Assets | $ 90.9 | 97.2
Does not earns/earning a return | Approved for recovery | Fuel and Purchased Power Adjustment Rider |  |
Regulatory Asset [Line Items] |  |
Remaining Recovery Period | 2 years |
Total Noncurrent Regulatory Assets | $ 57.4 | 68.3
Does not earns/earning a return | Approved for recovery | Unrealized Loss on Forward Commitments |  |
Regulatory Asset [Line Items] |  |
Remaining Recovery Period | 8 years |
Total Noncurrent Regulatory Assets | $ 53.3 | 131.4
Does not earns/earning a return | Approved for recovery | Unrealized Loss on Forward Commitments | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |
Regulatory Asset [Line Items] |  |
Remaining Recovery Period | 2 years |
Total Noncurrent Regulatory Assets | $ 3.9 | 29.9
Does not earns/earning a return | Approved for recovery | OVEC Purchased Power |  |
Regulatory Asset [Line Items] |  |
Remaining Recovery Period | 2 years |
Total Noncurrent Regulatory Assets | $ 52.0 | 50.1
Does not earns/earning a return | Approved for recovery | Plant Retirement Costs - Unrecovered Plant, Texas |  |
Regulatory Asset [Line Items] |  |
Remaining Recovery Period | 22 years |
Total Noncurrent Regulatory Assets | $ 44.5 | 48.7
Does not earns/earning a return | Approved for recovery | Cook Plant Nuclear Refueling Outage Levelization |  |
Regulatory Asset [Line Items] |  |
Remaining Recovery Period | 3 years |
Total Noncurrent Regulatory Assets | $ 43.0 | 55.7
Does not earns/earning a return | Approved for recovery | Smart Grid Costs |  |
Regulatory Asset [Line Items] |  |
Remaining Recovery Period | 2 years |
Total Noncurrent Regulatory Assets | $ 33.8 | 26.3
Does not earns/earning a return | Approved for recovery | Postemployment Benefits |  |
Regulatory Asset [Line Items] |  |
Remaining Recovery Period | 3 years |
Total Noncurrent Regulatory Assets | $ 27.9 | 30.6
Does not earns/earning a return | Approved for recovery | Ohio Enhanced Service Reliability Plan |  |
Regulatory Asset [Line Items] |  |
Remaining Recovery Period | 2 years |
Total Noncurrent Regulatory Assets | $ 26.2 | 35.3
Does not earns/earning a return | Approved for recovery | 2020-2022 Virginia Triennial Under Earnings |  |
Regulatory Asset [Line Items] |  |
Remaining Recovery Period | 3 years |
Total Noncurrent Regulatory Assets | $ 26.0 | 37.4
Does not earns/earning a return | Approved for recovery | Ohio Distribution Investment Rider |  |
Regulatory Asset [Line Items] |  |
Remaining Recovery Period | 2 years |
Total Noncurrent Regulatory Assets | $ 11.0 | $ 35.3

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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + 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
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