NOTICE OF FILING AND PUBLIC HEARING Duke Energy Carolinas, LLC’s Application Related to Cost Reconciliation Proceeding Regarding the Actual Storm Recovery Costs of Hurricane Helene and Notification of the Incremental O&M Cost Methodology to Be Applied Docket No. 2026-233-E Why is this Notice Important? On September 18, 2026, Duke Energy Carolinas, LLC (“DEC” or the “Company”) filed a Petition Related to Cost Reconciliation Proceeding Regarding the Actual Storm Recovery Costs of Hurricane Helene and Notification of the Incremental O&M Cost Methodology to Be Applied (“Petition”) with the Public Service Commission of South Carolina (the “Commission”). What is Duke Energy Carolinas, LLC asking the Commission to review and approve in the Company’s Petition? • (1) The Company’s actual storm recovery costs of $514.828 million (“Storm Recovery Costs”), which it incurred because of Hurricane Helene and include incremental Operation & Maintenance expenses, capital costs, carrying costs, and costs related to storm reserve funding and (2) actual upfront financing costs of $5.542 million • DEC’s actual Storm Recovery Costs are approximately ($41.113) million lower than the estimated Storm Recovery Costs, which will result in a credit to DEC customers; and • Other relief requested in the Petition as may be just and reasonable The case was filed according to S.C. Code Ann. Section 58-27-1110, S.C. Code Ann. Regs. 103-825, and other applicable rules and regulations of the Commission; and this hearing has been scheduled according to Order No. 2026-634, S.C. Code Ann. Section 58-27-1110 and S.C. Code Ann. Regs. 103-817. For the entire Case visit: https://dms.psc.sc.gov/Web/Dockets/Detail/11981 When Will the Commission Hear the Company’s Case? When: Wednesday, February 24, 2027 at 10:00 a.m. 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? Duke Energy Carolinas, LLC 803-988-7132 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, November 20, 2026; or • Mail a Petition to Intervene to 101 Executive Center Drive, Suite 100, Columbia, SC 29210 no later than Friday, November 20, 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. 10/16/26 (CLC)