Energy Transfer Partners, L.P. engages in the natural gas midstream, and intrastate transportation and storage businesses in the United States. The company's Intrastate Transportation and Storage segment transports natural gas from various natural gas producing areas, and through ET fuel system and HPL system. This segment owns and operates approximately 7,900 miles of natural gas transportation pipelines and three natural gas storage facilities in Texas. Its Interstate Transportation and Storage segment provides natural gas transportation and storage services; owns and operates approximately 11,800 miles of interstate natural gas pipeline; and has interests in various natural gas pipelines. The company's Midstream segment gathers, compresses, treats, blends, processes, and markets natural gas. It owns and operates natural gas and natural gas liquids (NGL) gathering pipelines, natural gas processing plants, natural gas treating facilities, and natural gas conditioning facilities. The company's Liquids Transportation and Services segment transports mixed NGLs and other hydrocarbons; stores mixed NGLs, NGL products, and petrochemical products; and separates mixed NGL streams into purity products. This segment owns and operates various NGL pipelines, and NGL storage facilities with aggregate storage capacity of approximately 53 million barrels. Its Investment in Sunoco Logistics segment gathers, purchases, markets, and sells crude oil; and owns and operates approximately 1,800 miles of refined products pipelines. The company's Other segment provides natural gas compression equipment and compression services; manages coal and natural resources property, sells standing timber, and leases coal-related infrastructure facilities; and generates electrical power. Energy Transfer Partners, L.P. was founded in 1995 and is based in Dallas, Texas.