Notice of Filing and Public Hearings Application of Duke Energy Progress, LLC, for Increase in Electric Rates, Adjustments in Electric Rate Schedules and Tariffs, and Request for an Accounting Order - Docket No. 2025-154-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 Progress, LLC, (“DEP” or “the Company”) can charge. • DEP 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 $74.8 million. Electric rates, if approved, will be effective for service rendered on and after February 1, 2026. Duke Energy Progress, LLC Residential Service – Rate RES Current and Proposed Typical Bill Example Typical Bill Current Bill Bill After Total Typical Bill kWh Sales As of June 1, 2025 Effective February 1, 2026 Increase 1,000 kWh $144.85 $166.51 $21.66 Monthly Bill Impacts Line No. Customer Average Sales Average Month- Average Class per Bill (kWh) ly Bill Impact¹ Monthly $ Increase Bill Impact¹ % Increase 1 Residential 1,140 $24.66 15.1% 2 Commercial 9,684 $126.68 12.8% 3 Industrial 2,344,770 $6,008.43 3.6% ¹ 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 Monday, October 27, 2025, at 10:00 a.m. and continuing through the week as necessary, 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 Florence, Sumter, and/or Lee Counties or in-person or virtually in Columbia. Date and Time of Hearing: Location: Please Pre-Register By: September 25, 2025, Florence County Council September 18, 2025 at 6:00 p.m. Chambers, County Complex 180 N. Irby Street, Room 803, Florence, South Carolina 29501 September 29, 2025, Sumter High School Auditorium September 22, 2025 at 6:00 p.m. 2580 McCray’s Mill Road, Sumter, South Carolina 29154 October 2, 2025, Lee County Courthouse September 25, 2025 at 6:00 p.m. 123 South Main Street, Bishopville, South Carolina 29010 October 27, 2025 Public Service Commission October 20, 2025 AM Session: 10 a.m. – 1 p.m. Hearing Room PM Session: 4 p.m. – 8 p.m. 101 Executive Center Drive, Columbia, SC 29210 For information on this entire Case, visit: https://dms.psc.sc.gov/Web/Dockets/Detail/119377 Intervention deadline: Wednesday, September 10, 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 Progress, LLC, 1-803-988-7132, or for public information on this filing, contact the Public Service Commission at 1-803-896-5100.