Williams Partners L.P. focuses on natural gas transportation; gathering, treating, and processing; storage; natural gas liquid (NGL) fractionation, and oil transportation. The Company operates in two segments: Gas Pipeline, and Midstream Gas & Liquids. Its Gas Pipeline segment includes its interstate natural gas pipelines and pipeline joint venture investments. Its Midstream Gas & Liquids segment includes its natural gas gathering, treating and processing business and consists of wholly owned and partially owned subsidiaries. On February 17, 2012, the Company acquired 100% interest in certain entities from Delphi Midstream Partners, LLC. In April 2012, the Company completed the acquisition of Caiman Energy�s wholly owned subsidiary, Caiman Eastern Midstream, LLC. In November 2012, it acquired Williams Companies Inc's approximately 83% interest in the Geismar olefins production facility, as well as Williams� refinery-grade propylene splitter and pipelines in the Gulf region.