Exxon Mobil Corporation engages in the exploration, production, transportation, and sale of crude oil and natural gas. It also engages in the manufacture of petroleum products, and transportation and sale of crude oil, natural gas, and petroleum products. The company manufactures and markets commodity petrochemicals, including olefins, aromatics, polyethylene and polypropylene plastics, and other specialty products. Exxon Mobil also has interests in electric power generation facilities. As of December 31, 2007, it had 7744 millions of barrels of liquid proved reserves, and 32,610 billions of cubic feet of proved reserves of natural gas. Exxon Mobil also operated 16,797 gross wells. The company operates in the United States, Canada, Europe, Africa, Asia-Pacific, the Middle East, Russia/Caspian region, and South America. Exxon Mobil was founded in 1870. The company was formerly known as Exxon Corporation and changed its name to Exxon Mobil Corporation in 1999. Exxon Mobil is based in Irving, Texas.