Notice of Southern Natural Gas Company, L.L.C. and Elba Express Company’s Proposed South System Expansion 4 Project Southern Natural Gas Company, L.L.C. (“SNG”) and Elba Express Company, L.L.C. (“EEC”), collectively (“Companies”) are planning to construct and install its proposed South System Expansion 4 Project (“Project”) in the states of Mississippi, Alabama, and Georgia as discussed in more detail below. Companies are interstate natural gas transmission pipeline companies with their principal office located at 569 Brookwood Village, Suite 600, Birmingham, AL 35209. On June 30, 2025, Companies filed an application seeking the issuance of a certificate of public convenience and necessity (“Application”) with the Federal Energy Regulatory Commission (“Commission” or “FERC”) for the Project. The Commission assigned Docket No. CP25-517-000 to the certificate proceedings. The proposed Project includes the construction, operation, and maintenance of the following facilities as described in more detail below: • SNG will construct 14 new continuous natural gas pipeline loops totaling approximately 291 miles, primarily along its existing South Main Line in Mississippi, Alabama, and Georgia. These loops include 22 segments which consist of both brownfield and limited greenfield segments and will increase system capacity to meet growing demand. • SNG will install new compression and/or perform horsepower expansions at 12 existing compressor stations across Mississippi, Alabama, and Georgia. This includes installation of new compressor units, re-wheeling or tuning of existing units, and associated auxiliary facilities. EEC will install new compression at two existing compressor stations in Georgia (Jefferson and Rincon Compressor Stations) to support deliveries along its north-to-south corridor. • SNG will abandon nine existing compressor units at four compressor stations, replacing them with more efficient units at the same sites. SNG will also abandon approximately 2.2 miles of the 16-inch K Gen Lateral in Clarke County, Mississippi—1.6 miles by removal and 0.6 miles in place. • SNG will construct one new meter station in Mississippi and one new meter station in Georgia and modify nine existing meter stations in Alabama and Georgia to accommodate new or upgraded interconnections. EEC will construct one new meter station in Chatham County, Georgia. • SNG and EEC will also construct the appurtenant and auxiliary facilities necessary to support the safe and reliable construction, operation, and maintenance of the facilities described above. Companies are requesting that the Commission issue an order granting the requested authorizations by July 1, 2026. The issuance of the requested authorizations by that date will allow Companies to place the complete and place the Project facilities in-service no later than November 1, 2028 for Phase I and November 1, 2029 for Phase II, which is the requested in-service date for the facilities as set forth in the binding precedent agreements executed by the Project shippers. During construction, restoration, and mitigation activities for the Project, Companies will follow the Commission’s Upland Erosion Control, Revegetation and Maintenance Plan (May 2013 version) and the Commission’s Wetland and Waterbody Construction and Mitigation Procedures (May 2013 version), with approved deviations. Within three business days following the date the Commission assigns a docket number in the proceeding, Companies will place an electronic copy of the public version of the Application pertaining to the Project at the following locations: Stonewall Public Library, 801 Erwin Rd, Stonewall, MS 39363; Meridian Lauderdale County Public Library, 2517 7th St, Meridian, MS 39301; York Hightower Library, 638 Ave A St, York, AL 36925; Demopolis Public Library, 211 E Washington St, Demopolis, AL 36732; Marion-Perry County Library, 202 Washington St, Marion, AL 36756; Selma Dallas County Public Library, 1103 Selma Ave, Selma, AL 36703; Autauga-Prattville Public Library, 254 Doster St, Prattville, AL 36067; Millbrook Public Library, 3650 Grandview Rd, Millbrook, AL 36054; Ford Motor Company Library, 838 W Montgomery Rd, Tuskegee, AL 36088; Opelika Public Library, 1100 Glenn St, Opelika, AL 36801; Tallassee Community Library, 99 Freeman Ave, Tallassee, AL 36078; Hale County Library, 1103 Main St, Greensboro, AL 36744; North Columbus Public Library, 5689 Armour Rd, Columbus, GA 31909; Fortson Public Library, 61 McDonough St, Hampton, GA 30228; Harris County Public Library, 7511 GA-116, Hamilton, GA 31811; Talbot County Library, 75 Jefferson St, Talbotton, GA 31827; Riverside Branch Library, 110 Holiday Dr N, Macon, GA 31210; Monroe County Library, 62 West Main St, Forsyth, GA 31029; Hancock Branch, 127 E Hancock Street, Ste C, Milledgeville, GA 31061- 3413; Deepstep Public Library, 9676 Deepstep Rd, Sandersville, GA 31082; Glascock County Public Library, 738 Railroad Ave, Gibson, GA 30810; McCollum Public Library, 405 N Main St, Wrens, GA 30833; Diamond Lakes Library, 101 Diamond Lakes Way, Hephzibah, GA 30815; Flint River Regional Library, 800 Memorial Dr, Griffin, GA 30223; Hightower Memorial Library, 800 W Gordon St, Thomaston, GA 30286; Crawford County Public Library, 340 McCrary Ave, Roberta, GA 31078; Jones County Library, 146 Railroad St, Gray, GA 31032; Clayton County Library System - Riverdale Branch, 420 Valley Hill Rd, Riverdale, GA 30274; McMullen Southside Library, 527 Griffin Avenue Valdosta, GA 31601; Chatham County Public Library, 2002 Bull St, Savannah, GA 31401; Burke County Public Library, 130 GA-24, Waynesboro, GA 30830; Carrie Dorsey Perry Memorial Library, 315 W Marion Ave, Nashville, GA 31639; Screven County Library, 106 S Community Dr, Sylvania, GA 30467; and Rincon Library, 105 W 17th St, Rincon, GA 31326. Additionally, a copy of Companies’ Application is available for viewing on the Commission’s website at www.ferc.gov. Also available on this website is the Commission’s most recent landowner pamphlet entitled “An Interstate Natural Gas Facility on My Land? What Do I Need To Know?” The pamphlet includes the Commission’s summary of landowner rights at the Commission. You may reach the Commission through its website or by calling the Commission’s Office of External Affairs at (866) 208-3372. For landowners with property directly affected by this Project, a representative of Companies have been in contact with those landowners regarding the Project and will be contacting such landowners again in the near future to further discuss the Project. Companies have mailed notices regarding the Project to landowners directly affected by this Project, to landowners whose property abuts the Project, and to government entities and regulatory agencies. If you have not received such a notice, your property is most likely not affected. Companies strive to be a good neighbor as it provides a safe, clean, and reliable source of energy to the nation’s consumers and industry. Questions concerning the Project may be directed to Companies at (833) 941-0068.