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 operates in two segments, Electric Utility and Natural Gas Midstream Operations. The Electric Utility segment generates, transmits, distributes, and sells electric energy in Oklahoma and western Arkansas. This segment furnishes retail electric service in 267 communities and their contiguous rural and suburban areas; and owns and operates coal-fired, natural gas-fired, and wind-powered generating facilities. The Natural Gas Midstream Operations segment is involved in gathering, processing, transporting, and storing natural gas; provision of crude oil gathering services, and interstate and intrastate natural gas pipeline transportation and storage service to natural gas producers, utilities, and industrial customers. As of December 31, 2014, the company owned and operated interconnected electric generation, transmission, and distribution system, including 10 generating stations with an aggregate capability of 6,845 megawatts; and a transmission system comprising 53 substations and 4,888 structure miles of lines in Oklahoma, and 7 substations and 277 structure miles of lines in Arkansas. Its distribution system consisted of 354 substations, 29,197 structure miles of overhead lines, 2,369 miles of underground conduit, and 10,646 miles of underground conductors in Oklahoma, as well as 31 substations, 2,778 structure miles of overhead lines, 243 miles of underground conduit, and 694 miles of underground conductors in Arkansas. OGE Energy Corp. was founded in 1995 and is headquartered in Oklahoma City, Oklahoma.