Williams is initiating an open season from September 3 to September 29, 2014 for the Western Marcellus Pipeline Project, an expansion of the Transco interstate pipeline to provide incremental firm natural gas transportation capacity to growing markets in the Mid-Atlantic and southeastern United States by late 2018. Transco is a wholly owned subsidiary of Williams Partners, L.P., of which Williams owns controlling interests and is the general partner.

The Western Marcellus Pipeline Project is being designed to provide from one billion to in excess of two billion cubic feet per day of new natural gas transportation capacity from receipt points in the Western Marcellus and Utica supply areas to points as far south as Transco's Zone 3 compressor station 65 in Mississippi and as far north as the proposed Zone 6 River Road point in Pennsylvania. The project would connect Williams' Ohio Valley Midstream processing and gathering system in northern West Virginia with the Transco pipeline, the largest volume pipeline system in the United States.

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