Southern Union Company, together with its subsidiaries, engages in the gathering, processing, transportation, storage, and distribution of natural gas in the United States. The company operates in three segments: Transportation and Storage, Gathering and Processing, and Distribution. The Transportation and Storage segment primarily engages in the interstate transportation and storage of natural gas from gas producing areas in Texas, Oklahoma, Colorado, the Gulf of Mexico, and the Gulf Coast to markets throughout the Midwest and from the Gulf Coast to Florida; and liquid natural gas terminalling and regasification services. The Gathering and Processing segment engages in the gathering, transmission, treating, processing, and redelivery of natural gas and natural gas liquids in Texas and New Mexico. The Distribution segment engages in the local distribution of natural gas in Missouri and Massachusetts. As of December 31, 2006, the company distributed natural gas to approximately 560,000 residential, commercial, and industrial customers through local distribution systems consisting of 8,983 miles of mains, 6,028 miles of service lines, and 45 miles of transmission lines. The company was incorporated in 1932 and is based in Houston, Texas.