The staff of the Federal Energy Regulatory Commission (FERC or Commission) has prepared a draft environmental impact statement (EIS) for the Kosciusko Junction Pipeline Project proposed by Gulf South Pipeline Company, LLC (Gulf South) and Texas Gas Transmission, LLC (collectively “the Applicants”), subsidiaries of Boardwalk Pipeline, LP, in Docket Numbers CP25-547-000 and CP25-549-000. The Applicants propose to construct and operate 110.9 miles of various size pipelines, abandon by sale/acquire about 98 miles of existing pipeline, and install new or modify existing aboveground facilities. The project crosses Washington, Sunflower, Humphreys, Holmes, Attala, Leake, Newton, Jasper, and Clarke Counties, Mississippi.
Texas Gas proposes to abandon by sale to Gulf South an existing 98-mile-long pipeline of varying diameters (Greenville Lateral) and auxiliary and appurtenant facilities, and an existing compressor station. Texas Gas would also modify an existing compressor station to support the abandonment and maintain continued service to its shipper (the Greenville Compressor Station [CS]). Gulf South proposes to acquire the Greenville Lateral and a compressor station from Texas Gas and construct and operate about 110.9 miles of new 36-inch-diameter natural gas pipeline and pipeline lateral facilities; two new natural gas-fired compressor stations (the Holmes and Kosciusko CSs); modifications to the existing compressor station (the Isola CS) acquired from Texas Gas; and four new meter stations.
The Applicants would construct the Project using temporary and permanent rights-of-way ranging from 75 to 135 feet wide along the pipelines, along with temporary workspaces, 5 contractor yards, and 15 new permanent and 87 temporary access roads. During Project operation, the Applicants would generally maintain 50-foot-wide permanent rights-of-way centered over the pipelines along with new permanent access roads serving Project facilities. Subject to all necessary regulatory approvals and clearances, the Applicants propose to begin construction of the project in December of 2026. The Applicants anticipate commencing service on April 28, 2028.
The EIS was prepared in compliance with the requirements of the National Environmental Policy Act (NEPA) and the FERC regulations implementing NEPA (18 CFR 380). The conclusions and recommendations presented in the EIS are those of the FERC environmental staff. The U.S. Army Corps of Engineers, U.S. Environmental Protection Agency, and U.S. Fish and Wildlife Service participated as cooperating agencies in the preparation of the EIS.
FERC staff conclude that construction and operation of the project would result in some adverse environmental impacts. Most adverse environmental effects would be temporary or short-term during construction, but some long-term and permanent environmental effects would occur on some forested lands, including forested wetlands. With implementation of the Applicants’ impact avoidance, minimization, and mitigation measures, as well as adherence to Commission staff’s recommendations (found in section 5.2 of the EIS), Commission staff conclude that Project effects would be reduced to less than significant levels, except for climate change impacts that are not characterized in this EIS as significant or insignificant.
The FERC Commissioners will take into consideration staff’s recommendations when they make a decision on the project. Comments on the draft EIS are due to the Commission on or before 5:00 pm Eastern Time on May 25, 2026.
Technical details About the Project:
The Kosci Junction Project will expand Boardwalk’s system capacity and regional connectivity through new infrastructure across Mississippi. Designed for up to 1.16 billion cubic feet per day (Bcf/d) of natural gas, with potential expansion to 1.58 Bcf/d, the project will link multiple shale basins to fast-growing demand centers throughout the Southeast.
Key project components
- 103 miles of new 36-inch pipeline from Attala County to Clarke County, Mississippi
- 8 miles of new 36-inch pipeline in Humphreys and Sunflower counties, Mississippi
- Construction of the new Kosci Compressor Station in Attala County, Mississippi
- Construction of the new Holmes Compressor Station in Holmes County, Mississippi
- Additional compression at the existing Greenville Compressor Station in Washington County, Mississippi
- Additional compression at the existing Isola Compressor Station in Humphreys County, Mississippi
Construction / operation / safety
The Kosci Junction Project will be constructed and operated in accordance with rigorous safety and engineering standards established by the Department of Transportation (DOT) and the Federal Energy Regulatory Commission (FERC). During construction, qualified inspectors will oversee each phase to help ensure compliance with safety protocols, including thorough testing of equipment and systems before facilities become operational. Compressor stations will be equipped with emergency shutdown systems and monitored 24/7 to track gas flow, pressure and equipment conditions.
Operational safety will be reinforced through regular inspections and maintenance to detect and address potential issues early. Boardwalk also engages with local communities through public awareness programs, providing safety information and emergency contact details. Compressor stations are designed to help minimize risk to surrounding areas and include features such as automatic and manual valves for rapid isolation, with coordination with first responders to support emergency preparedness.
