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EFFECTS OF REGULATION - Regulatory Liabilities (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023
Regulatory Liability [Line Items] |  |
Total Current Regulatory Liabilities | $ 53.5 | $ 26.5
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | 8,344.0 | 8,182.4
Pending final regulatory determination |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | 322.0 | 207.9
Approved for payment |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | 8,022.0 | 7,974.5
Pays/paying a return | Over-recovered Fuel Costs |  |
Regulatory Liability [Line Items] |  |
Total Current Regulatory Liabilities | $ 21.6 | 3.3
Remaining Refund Period | 1 year |
Pays/paying a return | Pending final regulatory determination |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | $ 176.0 | 103.1
Pays/paying a return | Pending final regulatory determination | Income Taxes, Net |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | 176.0 | 103.1
Pays/paying a return | Approved for payment |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | 5,526.4 | 5,823.1
Pays/paying a return | Approved for payment | Income Taxes, Net |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | 1,622.1 | 2,179.7
Regulatory liabilities, not subject to rate normalization requirements, amount | $ 192.0 | 228.0
Regulatory liabilities, not subject to rate normalization requirements, refund period | 10 years |
Pays/paying a return | Approved for payment | Asset Removal Costs |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | $ 3,828.0 | 3,563.5
Pays/paying a return | Approved for payment | Rockport Plant, Unit 2 Accelerated Depreciation for Leasehold Improvements |  |
Regulatory Liability [Line Items] |  |
Remaining Refund Period | 4 years |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | $ 35.9 | 44.9
Pays/paying a return | Approved for payment | Other Regulatory Liabilities Approved for Payment |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | 40.4 | 35.0
Does not pay/paying a return | Over-recovered Fuel Costs |  |
Regulatory Liability [Line Items] |  |
Total Current Regulatory Liabilities | $ 31.9 | 23.2
Remaining Refund Period | 1 year |
Does not pay/paying a return | Pending final regulatory determination |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | $ 146.0 | 104.8
Does not pay/paying a return | Pending final regulatory determination | FERC 2021 Transmission Formula Rate Challenge Refunds |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | 131.3 | 103.1
Does not pay/paying a return | Pending final regulatory determination | Other Regulatory Liabilities Pending Final Regulatory Determination |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | 14.7 | 1.7
Does not pay/paying a return | Approved for payment |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | $ 2,495.6 | 2,151.4
Does not pay/paying a return | Approved for payment | Over-recovered Fuel Costs |  |
Regulatory Liability [Line Items] |  |
Remaining Refund Period | 8 years |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | $ 32.1 | 26.1
Does not pay/paying a return | Approved for payment | Other Regulatory Liabilities Approved for Payment |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | 90.1 | 106.5
Does not pay/paying a return | Approved for payment | Excess Nuclear Decommissioning Funding |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | $ 2,137.3 | 1,721.9
Does not pay/paying a return | Approved for payment | Deferred Investment Tax Credits |  |
Regulatory Liability [Line Items] |  |
Remaining Refund Period | 29 years |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | $ 65.1 | 154.5
Does not pay/paying a return | Approved for payment | Demand Side Management |  |
Regulatory Liability [Line Items] |  |
Remaining Refund Period | 2 years |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | $ 52.6 | 31.3
Does not pay/paying a return | Approved for payment | Spent Nuclear Fuel |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | $ 50.4 | 47.6
Does not pay/paying a return | Approved for payment | 2017-2019 Virginia Triennial Revenue Provision |  |
Regulatory Liability [Line Items] |  |
Remaining Refund Period | 25 years |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | $ 35.2 | 37.1
Does not pay/paying a return | Approved for payment | Peak Demand Reduction/Energy Efficiency |  |
Regulatory Liability [Line Items] |  |
Remaining Refund Period | 2 years |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | $ 32.8 | $ 26.4

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amortization period for the recovery of regulatory liability, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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