NOTICE TO THE PUBLIC OF AN APPLICATION BY VIRGINIA ELECTRIC AND POWER COMPANY D/B/A DOMINION ENERGY VIRGINIA FOR APPROVAL OF A RATE ADJUSTMENT CLAUSE PURSUANT TO 56-585.1 A 4 OF THE CODE OF VIRGINIA CASE NO. PUR-2026-00056 LEGAL NOTICE VIRGINIA ELECTRIC AND POWER COMPANY D/B/A DOMINION ENERGY On May 1, 2026, Virginia Electric and Power Company d/b/a Dominion Energy Virginia ("Dominion" or "Company"), pursuant to 56-585.1 A 4 ("Subsection A 4") of the Code of Virginia ("Code") and 20 VAC 5-204-5, 20 VAC 5-204-10, 20 VAC 5-204- 60, and 20 VAC 5-204-90 of the Rules Governing Utility Rate Applications and Annual Informational Filings of Investor-Owned Electric Utilities, 20 VAC 5-204-5, et seq., filed an application ("Application") with the State Corporation Commission ("Commission") for approval of a revised increment/decrement rate adjustment clause designated as Rider T1. Pursuant to 56-585.1 A 7 of the Code, "the Commission's final order regarding any petition filed pursuant to [Subsection A 4] . . . shall be entered not more than three months . . . after the date of filing of such petition." Subsection A 4 deems to be reasonable and prudent, among other things, the "costs for transmission services provided to the utility by the regional transmission entity of which the utility is a member" and "costs charged to the utility that are associated with demand response programs approved by the Federal Energy Regulatory Commission [("FERC")] and administered by the regional transmission entity of which the utility is a member." The Company has been a member of PJM Interconnection, L.L.C. ("PJM"), a regional transmission entity that has been approved by FERC as a regional transmission organization, since 2005. Dominion, as an integrated electric utility member of PJM, obtains transmission service from PJM and pays PJM charges for such service at the rates contained in PJM's Open Access Transmission Tariff approved by FERC. The Company states that it also pays PJM charges for costs associated with demand response programs approved by FERC and administered by PJM. In this proceeding, Dominion seeks approval of a revenue requirement for the rate year September 1, 2026, through August 31, 2027 ("Rate Year"). This revenue requirement, if approved, would be recovered through a combination of base rates and a revised increment/decrement Rider T1. Rider T1 is designed to recover the increment/ decrement between the revenues produced from the Subsection A 4 component of base rates and the new revenue requirement developed from the Company's Subsection A 4 costs for the Rate Year. The total proposed revenue requirement to be recovered over the Rate Year is $1,538,974,037, comprising an increment Rider T1 of $998,533,997, and forecast collections of $540,440,040 through the transmission component of base rates. This total revenue requirement represents an increase of $206,899,352 compared to the revenues projected to be produced during the Rate Year by the combination of the base rate component of Subsection A 4 (the Company's former Rider T) and the Rider T1 rates currently in effect. Implementation of the proposed Rider T1 on September 1, 2026, would increase the total monthly bill of a typical residential customer using 1,000 kilowatthours per month by $2.90. In Case No. PUR-2025-00058, the Commission directed the Company, in its next filing pursuant to Code 56-585.1 A 4, to develop and propose alternative cost allocations for the purpose of examining transmission cost allocation. The Commission further directed that one alternative shall be a modified Average & Excess model that incorporates principles from a six-month (or higher) coincident peak allocation methodology. In response to this directive, the Company addresses, among other things: (i) the requested alternative cost allocation methodologies; (ii) the impact of such methods on the GS-5 rate class; and (iii) whether there are any additional considerations impacting transmission rates of return, especially for the GS-4 and GS-5 classes, beyond allocation methodology. TAKE NOTICE that the Commission may adopt rates that differ from those appearing in the Company's Application and supporting documents and may apportion revenues among customer classes and/or design rates in a manner differing from that shown in the Application and supporting documents. The Commission entered an Order for Notice and Hearing that, among other things, scheduled public hearings on the Company's Application. On July 14, 2026, at 10 a.m., the Commission will hold a telephonic hearing for the purpose of receiving the testimony of public witnesses. On or before July 9, 2026, any person desiring to offer testimony as a public witness shall provide required contact information to the Commission. This information may be provided to the Commission: (i) by filling out a form on the Commission's website at scc.virginia.gov/case-information/webcasting; or (ii) by calling (804) 371-9141. This public witness hearing will be webcast at scc.virginia.gov/caseinformation/webcasting. On July 14, 2026, at 10 a.m., or at the conclusion of the public witness portion of the hearing, whichever is later, in the Commission's second floor courtroom located in the Tyler Building, 1300 East Main Street, Richmond, Virginia 23219, the Commission will convene a hearing to receive testimony and evidence offered by the Company, any respondents, and the Commission Staff. To promote administrative efficiency and timely service of filings upon participants, the Commission has directed the electronic filing of testimony and pleadings, unless they contain confidential information, and has required electronic service on parties to this proceeding. An electronic copy of the Company's Application may be obtained by submitting a written request to counsel for the Company: Jontille D. Ray, Esquire, McGuireWoods LLP, 800 East Canal Street, Richmond, Virginia 23219, or jray@mcguirewoods.com. Interested persons also may download unofficial copies from the Commission's website: scc.virginia.gov/case-information. On or before July 9, 2026, any interested person may submit comments on the Application electronically by following the instructions on the Commission's website: scc. virginia.gov/case-information/submit-public-comments. Those unable, as a practical matter, to submit comments electronically may file such comments by U.S. mail to the Clerk of the State Corporation Commission, c/o Document Control Center, P.O. Box 2118, Richmond, Virginia 23218-2118. All comments shall refer to Case No. PUR-2026-00056. On or before June 5, 2026, any person or entity wishing to participate as a respondent in this proceeding must do so by filing a notice of participation at scc.virginia.gov/clk/ efiling. Those unable, as a practical matter, to file a notice of participation electronically may file such notice by U.S. mail to the Clerk of the Commission at the address listed above. Such notice of participation shall include the email addresses of such parties and their counsel. A copy of the notice of participation as a respondent also must be served electronically on counsel for the Company, Commission Staff, and any other respondents. Pursuant to 5 VAC 5-20-80 B, Participation as a respondent, of the Commission's Rules of Practice and Procedure, 5 VAC 5-20-10 et seq. ("Rules of Practice"), any notice of participation shall set forth: (i) a precise statement of the interest of the respondent; (ii) a statement of the specific action sought to the extent then known; and (iii) the factual and legal basis for the action. Any notice of participation filed by a person not represented by counsel shall also set forth why the filer's positions in this matter are not adequately represented by another party to this proceeding and cannot be expressed through written or oral public comments as provided for in this proceeding. Any organization, corporation or government body participating as a respondent must be represented by counsel as required by 5 VAC 5-20-30, Counsel, of the Rules of Practice. All filings shall refer to Case No. PUR-2026-00056. On or before June 5, 2026, each respondent may file with the Clerk of the Commission at scc.virginia.gov/clk/efiling any testimony and exhibits by which the respondent expects to establish its case. Any respondent unable, as a practical matter, to file testimony and exhibits electronically may file such by U.S. mail to the Clerk of the Commission at the address listed above. Each witness's testimony shall include a summary not to exceed one page. All testimony and exhibits shall be served electronically on the Commission Staff, the Company, and all other respondents simultaneously with their filing. In all filings, the respondent shall comply with the Rules of Practice, including 5 VAC 5-20-140, Filing and service, and 5 VAC 5-20-240, Prepared testimony and exhibits. All filings shall refer to Case No. PUR-2026-00056. Any documents filed in paper form with the Office of the Clerk of the Commission in this docket may use both sides of the paper. In all other respects, except as modified by the Commission's Order for Notice and Hearing, all filings shall comply fully with the requirements of 5 VAC 5-20-150, Copies and format, of the Commission's Rules of Practice. The Commission's Rules of Practice, the Company's Application, the Commission's Order for Notice and Hearing, and other documents filed in this case may be viewed on the Commission's website at: scc.virginia.gov/case-information.