|OGE Energy Corp. (OGE Energy) is an energy and energy services provider offering physical delivery and related services for both electricity and natural gas in the south central United States. The Company conducts these activities through four business segments: electric utility, natural gas transportation and storage, natural gas gathering and processing and natural gas marketing. The electric utility segment generates, transmits, distributes and sells electric energy in Oklahoma and western Arkansas. Its operations are conducted through Oklahoma Gas and Electric Company (OG&E). OG&E is the electric utility in Oklahoma and its franchised service territory includes the Fort Smith, Arkansas area. As of December 31, 2011, the Company indirectly owns an 81.3% membership interest in Enogex Holdings LLC (Enogex Holdings). On April 1, 2011, Enogex completed the sale of its Harrah processing plant and the associated Wellston and Davenport gathering assets.