NOTICE OF FILING Petition to Establish a Generic Docket for the Purpose of Receiving Comments Addressing Large Load Additions Docket No. 2026-138-E Why is this Notice Important? • On May 27, 2026, Duke Energy Carolinas, LLC, and Duke Energy Progress, LLC, filed a Petition to Establish a Generic Docket for the Purpose of Receiving Comments Addressing Large Load Additions with the Public Service Commission of South Carolina (“Commission”). • The Petition requests that the Commission receive written comments concerning issues associated with new large load (50 megawatts or greater) additions, including existing rate schedules, service regulations, line extension policies, and interconnection rules, on topics related to new large load customers that include, but are not limited to: a. minimum contract period and contract demand for billing purposes; b. collateral requirements; c. exit policies and restrictions on customer capacity reduction; d. treatment of generation, transmission, and administrative costs; e. interconnection costs, including opportunities to support grid-enhancing technologies to manage such costs; f. optional tariff provisions for flexible interconnections; and g. optional tariff provisions for the management of clean behind-the-meter resources, and optional clean transition tariffs to enable direct selection of new clean energy resources. The Petition was filed pursuant to Order Nos. 2025-757 and 2025-769 and S.C. Code Ann. Regs. 103-825. Who Can I Talk to About This Notice? Duke Energy Carolinas, LLC & Duke Energy Progress, 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, crossex- amine 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 Monday, July 20, 2026; or • Mail a Petition to Intervene to 101 Executive Center Drive, Suite 100, Columbia, SC 29210 no later than Monday, July 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. Friday, June 12, 2026 GRR