XML 104 R94.htm IDEA: XBRL DOCUMENT
v3.24.3

Regulatory Assets and Liabilities (Schedule of Regulatory Assets) (Detail) - USD ($) $ in Millions | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Feb. 29, 2024 | Sep. 30, 2024 | Dec. 31, 2023
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-current | [1] |  | $ 1,030 | $ 1,309 | [2]
Regulatory assets-noncurrent | [1] |  | 8,352 | 8,356 | [2]
Total regulatory assets |  |  | 9,382 | 9,665 |
Virginia Electric and Power Company |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-current | [3] |  | 751 | 868 | [4]
Regulatory assets-noncurrent | [3] |  | 4,561 | 4,317 | [4]
Total regulatory assets |  |  | $ 5,312 | 5,185 |
Estimated under-recovered balances |  | $ 1,300 |  |  |
Weighted Average |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Weighted average useful life |  |  | 25 years |  |
Weighted Average | Virginia Electric and Power Company |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Weighted average useful life |  |  | 24 years |  |
SCANA |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Electric service customers over period |  |  | 20 years |  |
Derivatives |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-noncurrent | [5] |  | $ 80 | 107 |
Derivatives | Virginia Electric and Power Company |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-noncurrent | [5] |  | 41 | 66 |
Deferred cost of fuel used in electric generation |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-current | [6] |  | 35 | 245 |
Regulatory assets-noncurrent | [6] |  | 0 | 1,221 |
Deferred cost of fuel used in electric generation | Virginia Electric and Power Company |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-current | [6] |  | 10 | 95 |
Regulatory assets-noncurrent | [6] |  | 0 | 1,221 |
Securitized cost of fuel used in electric generation |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-current | [7] |  | 119 | 0 |
Regulatory assets-noncurrent | [7] |  | 1,081 |  |
Securitized cost of fuel used in electric generation | Virginia Electric and Power Company |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-current | [7] |  | 119 | 0 |
Regulatory assets-noncurrent | [7] |  | 1,081 |  |
Deferred rider costs for Virginia electric utility |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-current | [8] |  | 328 | 270 |
Regulatory assets-noncurrent | [8] |  | 680 | 496 |
Deferred rider costs for Virginia electric utility | Virginia Electric and Power Company |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-current | [8] |  | 328 | 270 |
Regulatory assets-noncurrent | [8] |  | 680 | 496 |
Ash pond and landfill closure costs |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-current | [9] |  | $ 111 | 200 |
Regulatory assets expected collection period commencing year |  |  | 2021 |  |
Ash pond and landfill closure costs | Virginia Electric and Power Company |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-current | [9] |  | $ 111 | 200 |
Ash pond and landfill closure costs | Maximum |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets amounts expected collection period |  |  | 18 years |  |
Ash pond and landfill closure costs | Minimum |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets amounts expected collection period |  |  | 15 years |  |
Deferred nuclear refueling outage costs |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-current | [10] |  | $ 67 | 63 |
Deferred nuclear refueling outage costs | Virginia Electric and Power Company |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-current | [10] |  | 67 | 63 |
NND Project Costs |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-current | [11] |  | 138 | 138 |
Regulatory assets-noncurrent | [11] |  | 1,845 | 1,949 |
CCR Remediation, Ash Pond and Landfill Closure Cost |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-noncurrent | [9] |  | 2,965 | 2,410 |
CCR Remediation, Ash Pond and Landfill Closure Cost | Virginia Electric and Power Company |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-noncurrent | [9] |  | 2,645 | 2,407 |
Derivatives |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-current | [5] |  | 31 | 162 |
Derivatives | Virginia Electric and Power Company |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-current | [5] |  | 29 | 160 |
Other |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-current |  |  | 201 | 231 |
Regulatory assets-noncurrent |  |  | 656 | 590 |
Other | Virginia Electric and Power Company |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-current |  |  | 87 | 80 |
Regulatory assets-noncurrent |  |  | 114 | 127 |
Unrecognized Pension and Other Postretirement Benefit Costs |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-noncurrent | [12] |  | 486 | 1,036 |
Unrecognized Pension and Other Postretirement Benefit Costs | Virginia Electric and Power Company |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-noncurrent | [12] |  | 0 | 0 |
Unrecognized Pension and Other Postretirement Benefit Costs | East Ohio, PSNC and Questar Gas |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-noncurrent |  |  |  | 215 |
Interest rate hedges |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-noncurrent | [13] |  | 167 | 168 |
Interest rate hedges | Virginia Electric and Power Company |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-noncurrent | [13] |  | 0 | 0 |
AROs and related funding |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-noncurrent | [14] |  | $ 392 | $ 379 |
Amortization period for deferred costs |  |  | 105 years |  |
Deferred Project Costs | Maximum |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Amortization period for deferred costs |  |  | 18 months |  |
[1] | See Note 15 for amounts attributable to VIEs.
[2] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2023 has been derived from the audited Consolidated Balance Sheet at that date.
[3] | See Note 15 for amounts attributable to VIEs.
[4] | Virginia Power’s Consolidated Balance Sheet at December 31, 2023 has been derived from the audited Consolidated Balance Sheet at that date.
[5] | Represents changes in the fair value of derivatives, excluding separately presented interest rate hedges, that following settlement are expected to be recovered from or refunded to customers.
[6] | Reflects deferred fuel expenses for the Virginia and North Carolina jurisdictions of Virginia Power’s electric generation operations. Additionally, Dominion Energy includes deferred fuel expenses for the South Carolina jurisdiction of its electric generation operations. In February 2024, Virginia Power completed a securitization of $1.3 billion of under-recovered fuel costs for its Virginia service territory.
[7] | Reflects under-recovered fuel costs for Virginia Power’s Virginia service territory securitized through the issuance of bonds by VPFS in February 2024. See Note 15 in this report and Notes 13 and 18 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2023 for additional information.
[8] | Reflects deferrals under Virginia Power’s electric transmission FERC formula rate and the deferral of costs associated with certain current and prospective rider projects.
[9] | Primarily reflects legislation in Virginia which requires any CCR asset located at certain Virginia Power stations to be closed by removing the CCR to an approved landfill or through beneficial reuse. These deferred costs are expected to be collected over a period between 15 and 18 years commencing December 2021 through Rider CCR. Virginia Power is entitled to collect carrying costs on uncollected expenditures once expenditures have been made. In addition, the balance at September 30, 2024 reflects amounts related to the EPA’s May 2024 final rule concerning CCR as discussed in Note 2.
[10] | Legislation in Virginia requires Virginia Power to defer operation and maintenance costs incurred in connection with the refueling of any nuclear-powered generating plant. These deferred costs will be amortized over the refueling cycle, not to exceed 18 months.
[11] | Reflects expenditures by DESC associated with the NND Project, which pursuant to the SCANA Merger Approval Order, will be recovered from DESC electric service customers over a 20-year period ending in 2039.
[12] | Represents unrecognized pension and other postretirement employee benefit costs expected to be recovered or refunded through future rates generally over the expected remaining service period of plan participants by certain of Dominion Energy’s rate-regulated subsidiaries. Includes regulatory assets of $215 million and regulatory liabilities of $12 million at December 31, 2023 related to retained pension and other postretirement benefit plan assets and obligations for the East Ohio, Questar Gas and PSNC Transactions reclassified to AOCI upon closing of each transaction.
[13] | Reflects interest rate hedges recoverable from or refundable to customers. Certain of these instruments are settled and any related payments are being amortized into interest expense over the life of the related debt, which has a weighted-average useful life of approximately 25 years and 24 years for Dominion Energy and Virginia Power, respectively, as of September 30, 2024.
[14] | Represents uncollected costs, including deferred depreciation and accretion expense, related to legal obligations associated with the future retirement of generation, transmission and distribution properties. The AROs primarily relate to DESC’s electric generating facilities, including Summer, and are expected to be recovered over the related property lives and periods of decommissioning which may range up to approximately 105 years.

X
- Definition Electric service customers over period. + References No definition available. + Details
Name: | d_ElectricServiceCustomersOverPeriod
Namespace Prefix: | d_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public utilities operating expense estimated fuel expenses under recovered balance. + References No definition available. + Details
Name: | d_PublicUtilitiesOperatingExpenseEstimatedFuelExpensesUnderRecoveredBalance
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Regulatory assets, amounts expected collection period. + References No definition available. + Details
Name: | d_RegulatoryAssetsAmountsExpectedCollectionPeriod
Namespace Prefix: | d_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Regulatory assets expected collection period commencing year. + References No definition available. + Details
Name: | d_RegulatoryAssetsExpectedCollectionPeriodCommencingYear
Namespace Prefix: | d_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amortization period for the recovery of regulatory asset, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_RegulatoryAssetAmortizationPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- 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
Name: | us-gaap_RegulatoryAssetLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. + 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
Name: | us-gaap_RegulatoryAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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
Name: | us-gaap_RegulatoryAssetsCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer. + 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
Name: | us-gaap_RegulatoryAssetsNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | dei_LegalEntityAxis=d_VirginiaElectricAndPowerCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_WeightedAverageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=d_SCANAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryLiabilityAxis=d_DerivativeLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=d_DeferredCostOfFuelUsedInElectricGenerationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=d_SecuritizedCostOfFuelUsedInElectricGenerationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=d_DeferredRiderCostsForVirginiaElectricUtilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=d_AshPondAndLandfillClosureCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=d_DeferredNuclearRefuelingOutageCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=d_NNDProjectCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=d_CcrRemediationAshPondAndLandfillClosureCostMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=d_DerivativeAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=us-gaap_OtherRegulatoryAssetsLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=d_UnrecognizedPensionAndOtherPostretirementBenefitCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=d_EastOhioPsncAndQuestarGasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=d_InterestRateHedgesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=d_AROsAndRelatedFundingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=us-gaap_DeferredProjectCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |