OGE Energy Corp., together with its subsidiaries, operates as an energy and energy services provider that offers physical delivery and related services for electricity and natural gas primarily in the south central United States. The company is involved in the generation, transmission, distribution, and sale of electric energy in Oklahoma and western Arkansas; and gathering, processing, transporting, storing, and marketing of natural gas. It furnishes retail electric service in 268 communities and their contiguous rural and suburban areas. OGE Energy Corp. operates coal-fired and natural gas-fired units, as well as wind-powered units. As of December 31, 2011, the company owned and operated 12 generating stations with an aggregate capability of 6,790 megawatts; and a transmission system comprising 51 substations and 4,258 structure miles of lines in Oklahoma, and 7 substations and 279 structure miles of lines in Arkansas. Its distribution system consisted of 353 substations, 27,854 structure miles of overhead lines, 1,895 miles of underground conduit, and 10,120 miles of underground conductors in Oklahoma, as well as 37 substations, 2,250 structure miles of overhead lines, 212 miles of underground conduit, and 572 miles of underground conductors in Arkansas. The company also owned approximately 6,019 miles of intrastate natural gas gathering pipelines in Oklahoma and Texas; approximately 2,250 miles of intrastate natural gas transportation pipelines in Oklahoma; and 2 underground natural gas storage facilities and 8 operating natural gas processing plants in Oklahoma. It serves residential, commercial, industrial, oilfield, public authorities, and street light operators. OGE Energy Corp. was founded in 1995 and is based in Oklahoma City, Oklahoma.