Be Heard READ CAREFULLY You have a right to comment. You do not have to attend. NOTICE OF FILING AND PUBLIC HEARINGS VIRTUAL & IN-PERSON CUSTOMER HEARINGS (OFF SITE & PSC OFFICES) Application of Dominion Energy South Carolina, Inc. for Authority to Adjust and Increase its Retail Electric Rates and Charges (*This Filing Includes a Request for an Increase to Retail Electric Rates) Docket No. 2025-325-E Why is this Notice Important? • Dominion Energy South Carolina, Inc. (“DESC” or “the Company”) is requesting a rate increase and changes to the Company’s electric rates and schedules for retail electric base rates. If approved, new rates will be effective for service rendered on and after the first billing cycle of July 2026. • The Public Service Commission of South Carolina (“Commission”) has scheduled public hearings in this case and will decide what rates DESC can charge. • According to the Application, the proposed rates and charges represent an overall average increase in retail revenues of 11.47%, or approximately $322 million. The details of the Company’s calculations are set forth in DESC’s Application and Prefiled Direct Testimony. The Monthly impact of DESC’s new proposed rates in dollars and percentages for typical Company customers is as follows: Customer Class1 Monthly Dollar Increase1 Average Monthly Percentage Increase Residential2 $19.98 12.73% Commercial $1,083.75 5.79% Industrial $81,550.80 15.34% 1 A typical customer would be (a) a residential Rate 8 customer using 1,000 kWh per month; (b) a Rate 20 commercial customer with a 500 kVA demand using 150,000 kWh; and (c) a 10 MW Rate 23 Industrial customer with a 90% load factor. The actual monthly bill impact will vary by each individual customer’s usage. 2 Please note that DESC is proposing a daily prorated Basic Facilities Charge, for residential rate schedules in its application. • Proposed changes to the Basic Facilities Charges and other rate schedules may be found in the Company’s Application and Prefiled Direct Testimony. Dominion Energy South Carolina Residential Service - Rate 8 Current and Proposed Bill Example Current Bill Bill After Total Effective July 1, 2026 1,000 kWh per month $157.00 $176.98 Percent Increase from Current Bill ($19.98 or 12.73% increase) The case was filed according to S.C. Code Ann. Sections 58-27-820, 58-27-860, and 58-27-870 et seq. and S.C. Code Ann. Regs. 103-303 and 103-823; and these hearings have been scheduled according to S.C. Code Ann. Section 58-27-870 and S.C. Code Ann. Regs. 103-817. For the Company’s complete proposal visit: https://dms.psc.sc.gov/Attachments/Matter/f1f73230-4a13-48f3-bf01-fb9a77e5404f For the entire Case visit: https://dms.psc.sc.gov/Web/Dockets/Detail/119566 When Will the Commission Hear the Utility’s Case? *The utility’s case will be heard after the Customer Public Hearings. When: Tuesday, May 12, 2026 at 10:00 A.M. and continuing as necessary at the call of the Chairman. Where: 101 Executive Center Drive, Hearing Room, Columbia, South Carolina 29210 Livestream: https://www.scetv.org/live/public-service-commission Who Can I Talk to About This Notice? Dominion Energy South Carolina, Inc. 1-800-251-7234 Office of Regulatory Staff 803-737-5230 or 1-800-922-1531 Department of Consumer Affairs 803-734-4200 or 1-800-922-1594 Public Service Commission 803-896-5100 How Can I Participate in this Case? (A customer may participate in the case by any or all of the ways listed below.) Option A: File a Letter of Protest by: • Emailing the completed Letter of Protest to contact@psc.sc.gov; or Mailing the completed Letter of Protest to 101 Executive Center Drive, Suite 100, Columbia, SC 29210. More information is available here: https://psc.sc.gov/consumer-info/file-letter-protest Option B: Attend public hearings before the Commission hears the Company’s request and other Parties’ requests. If you are interested in providing comments and/or attending the public hearing, you may appear in-person in Aiken, Bluffton, or Charleston. You may appear in-person or virtually in Columbia. See below: Date of Hearing: Location: Please Pre-Register By: Tuesday, March 31, 2026 Lonnie Hamilton III, Public Services Building Friday, March 20, 2026 at 6:00 p.m. Charleston County Council Chambers In-Person 4045 Bridge View Drive, 2nd Floor North Charleston, SC 29405 Thursday, April 2, 2026 Bluffton Town Council Chambers Tuesday, March 24, 2026 at 6:00 p.m. 20 Bridge Street In-Person Bluffton, SC 29910 Thursday, April 9, 2026 Aiken County Government Center Tuesday, March 31, 2026 at 6:00 p.m. County Council Chambers In-Person 1930 University Parkway, 3rd Floor Aiken, SC 29801 Tuesday, May 12, 2026 Public Service Commission Hearing Room 101 Tuesday, May 5, 2026 Morning Session: 10 a.m. – 12 p.m. Executive Center Drive Evening Session: 5 p.m. – 9 p.m. Columbia, SC 29210 In-Person or Virtual Only if needed** Public Service Commission Hearing Room 101 **Pre-registration for Wednesday, May Wednesday, May 13, 2026 Executive Center Drive 13, 2026, is available only if all pre- Evening Session: 5 p.m. – 9 p.m. Columbia, SC 29210 registration slots for customer testimony In-Person or Virtual are filled for Tuesday, May 12, 2026.** *Evening sessions will adjourn once pre-registered customers and customers in attendance have had the opportunity to testify or at 9:00 p.m., whichever is earlier. Virtual Access (available for Columbia hearings only): Watch Live at https://www.scetv.org/live/public-service-commission -OR- Call-In to Listen: US Toll-free Listen Line: +1-877-309-2073 Access Code: 601 673 909 The Commission will call the names of those persons who pre-register to testify first. Then the Commission will call the names of the other persons who did not pre-register to testify. Each testimony is limited to three (3) minutes, so everyone can be heard. All testimony will be given under oath. Testimony becomes part of the case/official record. If you would like to speak, you may sign up in one of three ways: E-mail communications@psc.sc.gov; or • Complete the following survey: https://app.smartsheet.com/b/form/019b94d1aaf27143a6b2c0ba32c7cffd; or • Call 803-896-4120. The Commission will call the names of those persons who pre-register to testify first. Then the Commission will call the names of the other persons who did not pre-register to testify. Option C: File a Petition to Intervene. An Intervenor becomes a party in the case. Intervenors have the right to testify, cross-examine witnesses, seek reconsideration of the Commission’s Final Decision, and must follow the Commission’s Rules of Practice and Procedure. To intervene, you must: • Email a Petition to Intervene to contact@psc.sc.gov no later than Monday, March 23, 2026; or • Mail a Petition to Intervene to 101 Executive Center Drive, Suite 100, Columbia, SC 29210 no later than Monday, March 23, 2026. Please include your email address. **You must give a copy of your Petition to Intervene to all Parties in this case. Petitions to Intervene must meet the requirements of Commission Regulation 103-825 and must be approved by the Commission. In the above referenced case, if the proposed tariffs contain any request for a change of rates, the proposed rates may be changed by the Commission. Persons seeking further information about these procedures should contact the Commission at 803-896-5100 or visit its website at www.psc.sc.gov. 1/16/26 GRR