The Southeast Supply Header, LLC (SESH) is a joint venture between subsidiaries of CenterPoint Energy and Spectra Energy. SESH received approval from the Federal Energy Regulatory Commission (FERC) in September 2007, and the pipeline is expected to be in service in mid-2008. The 270 mile, 36-inch and 42-inch diameter pipeline will have the capacity of 1 Bcf per day and will extend from the Perryville Hub in northeastern Louisiana to the Gulfstream Natural Gas System, L.L.C. pipeline system, which is 50 percent owned by an affiliate of Spectra Energy, near southern Mobile County, Alabama. Southern Natural Gas, an affiliate of El Paso Corporation, and SESH will jointly own the first 115 miles of the pipeline, which has an expanded design capacity of 1.5 Bcf per day.

SESH will link the onshore natural gas supply basins of east Texas and northern Louisiana to markets now predominantly served by offshore natural gas supplies from the Gulf of Mexico. The pipeline will give customers an important alternative to offshore supply, which can be vulnerable to weather-related disruptions.