Williams Partners L.P. (NYSE: WPZ) and its wholly-owned subsidiary Transcontinental Gas Pipe Line Company, LLC (Transco) today announced that the Federal Energy Regulatory Commission (FERC) has approved its application to construct and operate Transco’s Mobile Bay South III Expansion project, which would provide additional firm natural gas transportation capacity to growing markets in the Southeast United States by the spring of 2015.

The Mobile Bay South III Expansion Project is designed to provide 225,000 dekatherms per day of firm transportation service on the Transco Mobile Bay Lateral from the Station 85 4A Pooling Point and other receipt points located at Transco's Station 85 in Choctaw County, Ala., to interconnections with Florida Gas Transmission and Bay Gas Storage in Mobile County, Ala. The project would deliver enough natural gas to generate the energy equivalent of 65 million hours of electricity.

The proposed expansion would involve adding compression at Transco Compressor Station 85 in Choctaw County, Ala., along with upgrades at existing facilities in Washington and Mobile counties in Alabama. The capital cost of the project is estimated to be approximately $50 million. Construction is scheduled to begin in May 2014.

Transco is the nation's largest-volume interstate natural gas pipeline system. It delivers natural gas to customers through its 10,200-mile pipeline network whose mainline extends nearly 1,800 miles between South Texas and New York City. The system is a major provider of cost-effective natural gas services that reach U.S. markets in 12 Southeast and Atlantic Seaboard states, including major metropolitan areas in New York, New Jersey and Pennsylvania.

About Williams Partners L.P. (NYSE: WPZ)

Williams Partners L.P. is a leading diversified master limited partnership focused on natural gas transportation; gathering, treating, and processing; storage; natural gas liquid (NGL) fractionation; and oil transportation. The partnership owns interests in three major interstate natural gas pipelines that, combined, deliver 14 percent of the natural gas consumed in the United States. The partnership’s gathering and processing assets include large-scale operations in the U.S. Rocky Mountains, and both onshore and offshore along the Gulf of Mexico. Williams (NYSE: WMB) owns approximately 66 percent of Williams Partners, including the general-partner interest. More information is available at www.williamslp.com, where the partnership routinely posts important information.

Portions of this document may constitute “forward-looking statements” as defined by federal law. Although the partnership believes any such statements are based on reasonable assumptions, there is no assurance that actual outcomes will not be materially different. Any such statements are made in reliance on the “safe harbor” protections provided under the Private Securities Reform Act of 1995. Additional information about issues that could lead to material changes in performance is contained in the partnership’s annual reports filed with the Securities and Exchange Commission.