NOTICE OF FILING AND PUBLIC HEARING South Carolina Public Service Authority's ("Santee Cooper") 2026 Integrated Resource Plan (IRP) Docket No. 2026-18-E Why is this Notice Important? On September 30, 2026, South Carolina Public Service Authority ("Santee Cooper" or the "Company") filed its 2026 Integrated Resource Plan ("2026 IRP") with the Public Service Commission of South Carolina ("Commission"). This Notice is for customers of Santee Cooper and interested persons. What is an Integrated Resource Plan? An Integrated Resource Plan is an electric utility's forecast or prediction of the electric utility's resources needed to provide you with safe, reliable electricity in the future. Essentially, it is a utility's strategic operational plan for the next 15 years that considers both customers' demand for electricity and the utility's ability to supply it. The case was filed according to S.C. Code Ann. Section 58-37-40 and Commission Order No. 2025-468, and this hearing has been scheduled according to S.C. Code Ann. Section 58-37-40, Commission Order No. 2025-468, and S.C. Code Ann. Regs. 103-817. Links to Docket and 2026 IRP: Docket and Santee Cooper 2026 Integrated Resource Plan When Will the Commission Hear Santee Cooper's Case? When: Monday, May 24, 2027 at 10:00 AM, and the hearing will continue through the remainder of the week, if necessary (May 25th, May 26th, May 27th, and May 28th) with the start time as ordered by the Chair of the Commission. 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? South Carolina Public Service Authority ("Santee Cooper"): 843-761-8000 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 Ways to Get Involved in the Case How Can I Participate in this Case? A customer may participate in the case by the ways listed below. Option A: File a Letter of Protest by Emailing contact@psc.sc.gov; or Mailing 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, December 18, 2026; or Mail a Petition to Intervene to 101 Executive Center Drive, Suite 100, Columbia, SC 29210 no later than Friday, December 18, 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. IPL0383037 Oct 23 2026