Notice of Filing and Public Hearings Application of Duke Energy Carolinas, LLC, for Increase in Electric Rates, Adjustments in Electric Rate Schedules and Tariffs, and Request for an Accounting Order - Docket No. 2025-172-E Why is this Notice Important? • The Public Service Commission of South Carolina (“Commission”) has scheduled public hearings in this case and will decide what rates Duke Energy Carolinas, LLC (“DEC” or “the Company”) can charge. • Duke Energy Carolinas, LLC is requesting a rate increase and changes to the Company’s electric rates and schedules for retail electric base rates. • According to the Application, the proposed rates and charges represent an overall annual revenue increase of approximately • $150.5 million. Electric rates, if approved, will be effective for service rendered on and after March 1, 2026. Duke Energy Carolinas, LLC Residential Service – Rate RS-Current and Proposed Bill Example – Per Month Typical Bill kWh Sales Current Bill As of June Bill After Total Effective Typical Bill Increase 1, 20251 March 1, 2026 1,000 kWh $136.82 $147.19 $10.38 Monthly Bill Impacts Line No. Customer Class Average Sales Average Monthly Average Monthly per Bill Bill Bill Impact² % (kWh) Impact² $ Increase Increase 1 Residential 1,013 $12.78 9.5% 2 Commercial 4,928 $25.23 5.6% 3 Industrial 431,800 $1,643.17 6.1% 1 Does Not Include June 1, 2025 EDIT-1 Update. 2 The actual monthly bill impact will vary by each individual customer within each of the rate classifications, and by month. The table directly above includes the average rate increase calculation based on a weighted average of total proposed revenues and kWh across each customer class. The case was filed according to S.C. Code Ann. Sections 58-27-820 and 58-27-870 and S.C. Code Ann. Regs. 103-303 and 103-823; these hearings have been scheduled according to S.C. Code Ann. Section 58-27-870 and S.C. Code Ann. Regs. 103-817. A public merits hearing has been scheduled in this case to begin on Thursday, November 13, 2025, at 10:00 a.m. and continuing through the remainder of the week, as necessary, and continuing November 17, 2025, as needed, at the Public Service Commission, Hearing Room, 101 Executive Center Drive, Columbia, SC 29210. Public Hearings have also been scheduled for persons interested in attending and/or providing in-person testimony in Spartanburg, Anderson, Greenville, and/or Greenwood Counties or in-person or virtually in Columbia. Date and Time of Hearing: Location: Please Pre-Register By: October 6, 2025, at 6:00 p.m. Spartanburg County Council Chambers September 29, 2025 Spartanburg County Administration Building, 366 North Church Street, Suite 1000, Spartanburg, South Carolina 29720 October 13, 2025, at 6:00 p.m. Anderson County Council Chambers October 6, 2025 101 South Main Street, Anderson, South Carolina 29624 October 14, 2025, at 6:00 p.m. Greenville Technical College October 7, 2025 Prisma Health Center for Health & Life Sciences Multipurpose Room, 506 S. Pleasantburg Drive, Building Number 101, Greenville, South Carolina 29607 October 16, 2025, at 6:00 p.m. Greenwood 50 Performing Arts Center October 9, 2025 1816 Cokesbury Road, Greenwood, South Carolina 29649 November 13, 2025 Public Service Commission Hearing Room November 6, 2025 Morning Session: 10 a.m. – 1 p.m. 101 Executive Center Drive, Columbia, SC 29210 Evening Session: 4 p.m. – 8 p.m. For information on this entire Case, visit: https://dms.psc.sc.gov/Web/Dockets/Detail/119395 Intervention deadline: Monday, September 29, 2025 Manner of filing Intervention: Email a Petition to Intervene to contact@psc.sc.gov or mail a Petition to Intervene to 101 Executive Center Drive, Suite 100, Columbia, SC 29210. Please include your email address. You must give a copy of your Petition to Intervene to all Parties in this case. Manner to file Letters of Protest: File Public Comments or Letters of Protest by emailing contact@psc. sc.gov or mail Public Comments or Letters of Protest to 101 Executive Center Drive, Suite 100, Columbia, SC 29210. For questions regarding this filing, contact the Office of Regulatory Staff at 1-800-922-1531, the South Carolina Department of Consumer Affairs at 1-800-922-1594, Duke Energy Carolinas, LLC, 1-803-988-7132, or for public information on this filing, contact the Public Service Commission at 1-803-896-5100.