Williams Partners L.P., owns, operates, and acquires a portfolio of energy assets. Its Northeast G&P segment consists of midstream gathering and processing businesses in the Marcellus and Utica shale regions, a 51% investment in Laurel Mountain and a 58% investment in Caiman II. Atlantic-Gulf segment includes its interstate natural gas pipeline, Transcontinental Gas Pipe Line Company, LLC, and natural gas gathering and processing and crude oil production handling and transportation in the Gulf Coast region, a 50% investment in Gulfstream Natural Gas System, L.L.C., a 41% interest in Constitution Pipeline Company, LLC, and a 60% investment in Discovery Producer Services LLC. The West segment includes the Company�s natural gas gathering, processing and treating operations in New Mexico, Colorado, and Wyoming and its interstate natural gas pipeline, Northwest Pipeline, LLC. NGL & Petchem Services segment consists of 83.3% interest in an olefins production facility in Geismar, Louisiana.