Williams Partners is an energy infrastructure company that engaged in the gathering, processing and interstate transportation of natural gas and natural gas liquids. Co. operates in four business segments: Northeast G&P, which include natural gas gathering, compression, processing and NGL fractionation business in the Marcellus and Utica Shale regions; Atlantic-Gulf, which includes the Transco interstate natural gas pipeline that extends from the Gulf of Mexico to the eastern seaboard; West, which includes the Northwest Pipeline interstate natural gas pipeline; and natural gas liquids & Petchem Services, which operates an ethylene storage hub.