Mr. Ian Atkinson reports

SOUTHERN ENERGY CORP. ANNOUNCES RIG RELEASE OF COTTON VALLEY TEST WELL AT WILLIAMSBURG

Southern Energy Corp. has successfully drilled and cased the Terrible Creek 21-2 No. 2 Cotton Valley vertical well in the Williamsburg field. The drilling rig was released on Sept. 10, 2026. The well was drilled to a total depth of approximately 18,825 feet and encountered numerous prospective sands in the Sligo, Hosston and Cotton Valley formations. The company will begin completion and testing operations in the Cotton Valley formation, with test results to follow once available.

Ian Atkinson, president and chief executive officer of Southern, commented: "We are very pleased with the operational performance on our first Cotton Valley well in the Williamsburg field. The well was drilled safely, on budget and from spud date, to total depth in less than 22 days, making it one of the fastest wells in the area to reach depths greater than 18,500 feet. We identified several efficiencies that we expect to apply to future wells to further optimize drill times and capital costs. We are now planning the completion and testing operations and look forward to sharing those results."

Qualified person statement

Gary McMurren, chief operating officer, who has over 25 years of relevant experience in the oil industry, has approved the technical information contained in this announcement. Mr. McMurren is registered as a professional engineer with the Association of Professional Engineers and Geoscientists of Alberta and received a bachelor of science in chemical engineering (with distinction) from the University of Alberta.

About Southern Energy Corp.

Southern Energy is a natural gas exploration and production company characterized by a stable, low-decline production base, a significant low-risk drilling inventory and strategic access to premium commodity pricing in North America. Southern has a primary focus on acquiring and developing conventional natural gas and light oil resources in the southeastern Gulf states of Mississippi, Louisiana and eastern Texas. The company's management team has a long and successful history working together and has created shareholder value through accretive acquisitions, optimization of existing oil and natural gas fields, and redevelopment strategies, including horizontal drilling and multistaged fracture completion techniques.

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