NOTICE OF FILING Act No. 41 of 2025 and S.C. Code Ann. Section 58-42-30 and the Establishment of a Competitive Procurement Program for Dominion Energy South Carolina, Inc. for Energy Storage Facilities to Be Located in South Carolina Docket No. 2025-216-E Why is this Notice Important? On May 8, 2026, Dominion Energy South Carolina, Inc. ("DESC" or the "Company") filed an Application for Approval of Proposal for Competitive Procurement of South Carolina Energy Storage Facilities under Act 41 of 2025 with the Public Service Commission of South Carolina (the "Commission"). The Application requests approval of the DESC's proposal for competitive procurement program for battery energy storage system ("BESS") facilities, including the Program Guidelines and pro forma BESS RFP documents. Must DESC Conduct a Competitive Procurement for Stand-Alone Energy Storage Facilities? The Company must conduct competitive procurements of South Carolina-sited transmission-connected energy storage resources of more than 20 megawatts. What are DESC's Target Procurement Volume for Stand-Alone Energy Storage Acquisition? The Company's "target procurement volume for stand-alone [energy] storage acquisition may not exceed the portion of stand-alone storage in the most recent commission approved integrated resource plan or integrated resource plan annual update that is equal to the portion of the respective electrical utility's peak load attributable to South Carolina customers." (S.C. Code Ann. §58-42-30(A)(2)) According to the Company's 2026 Integrated Resource Plan, DESC does not have any immediate plans to issue a Request for Proposal for energy storage facilities. The case was filed according to Commission Order No. 2025-766 (also see Order Nos. 2025-766(A) and 2025-766(A)(A)), South Carolina Energy Security Act of 2025 ("Act 41") at S.C. Code Ann. §§ 58-42-10, 58-42-30, 58-27-820, and 58-3-140(A), and S.C. Code Ann. Regs. 103-823. For the entire Case visit: https://dms.psc.sc.gov/Web/Dockets/Detail/119439 Who Can I Talk to About This Notice? Dominion Energy South Carolina, Inc. 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 stakeholder may participate in the case by 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: 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 Friday, June 19, 2026; or Mail a Petition to Intervene to 101 Executive Center Drive, Suite 100, Columbia, SC 29210 no later than Friday, June 19, 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. Pursuant to Commission Order No. 2025-766 (also see Order Nos. 2025-766(A) and 2025-766(A)(A)), the Office of Regulatory Staff's and All Other Parties' Comments regarding the Companies' Application are due Friday, June 12, 2026 and the Companies' Reply Comments are due Monday, July 13, 2026. 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. May 20, 2026 GRR IPL0343309 May 29 2026