NOTICE OF FILING AND PUBLIC HEARING, INCLUDING ORAL ARGUMENTS Docket No. 2026-231-E - Duke Energy Carolinas, LLC’s and Duke Energy Progress, LLC’s Application for Approval of 2025 Competitive Procurement of Solar and Co-Located Storage Pursuant to S.C. Code Ann Section 58-42-20(G) Why is this Notice Important? • On August 28, 2026, Duke Energy Carolinas, LLC (“DEC”) and Duke Energy Progress, LLC (“DEP”) (collectively, “the Companies”) filed an Application for Approval of 2025 Competitive Procurement of Solar and Co-Located Storage Programs (“2025 CPRE Program”) pursuant to S.C. Code Ann. Section 58-42-20(G) with the Public Service Commission of South Carolina (“Commission”). What is the Companies’ 2025 Competitive Procurement of Solar and Co-Located Storage Program? • The 2025 CPRE Programs are designed to procure solar and solar paired with storage (SPWS) resources from both utility-owned and third party-owned facilities in South Carolina and North Carolina to meet the Companies’ system energy needs outlined in the Companies’ approved 2023 Integrated Resource Plan. • The 2025 CPRE Programs sought 1,700 MW of solar resources, including 900 MW of solar-only resources and up to 800 MW of SPWS with approximately 300 MW of battery storage, subject to a volume adjustment mechanism. What do the Companies want the Commission to approve? The Companies request, in part, that the Commission issue an Order stating that: • The Companies’ 2025 CPRE Program complies with S.C. Code Ann. Sections 58-42- 10(A) and 58-42-20(G); • The 2025 CPRE Program solicitation issued in August 2025, resulted in a fair, open, transparent, and non-discriminatory procurement; and • The Companies are permitted to recover costs incurred through the 2025 CPRE Program as provided for in Act 41 of 2025. The case was filed according to the South Carolina Energy Security Act of 2025 or Act 41 of 2025 at S.C. Code Ann. § 58-42-20(G), S.C. Code Ann. § 58-27-820, S.C. Code Ann. § 58-3-140(A), and S.C. Code Ann. Regs. 103-823, and this hearing has been scheduled according to S.C. Code Ann. Regs. 103-817. For the Company’s complete proposal visit: Companies Application For the entire Case visit: Detail for 2026-231-E When Will the Commission Hear the Company’s Case, including Oral Arguments? When: Tuesday, February 2, 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 and Duke 803-988-7132 Energy Progress LLC 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, October 16, 2026; or Mail a Petition to Intervene to 101 Executive Center Drive, Suite 100, Columbia, SC 29210 no later than Friday, October 16, 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. 9/11/2026 CLC