OGE Energy Corp. is a holding company. The Company is having investments in energy and energy services providers offering physical delivery and related services for both electricity and natural gas primarily in the south-central United States. The Company operates through two segments: electric utility and natural gas midstream operations. The electric utility segment operations are conducted through Oklahoma Gas and Electric Company (OG&E), which generates, transmits, distributes and sells electric energy in Oklahoma and western Arkansas. OG&E is an electric utility in Oklahoma, and its franchised service territory includes Fort Smith, Arkansas and the surrounding communities. The natural gas midstream operations segment represents the Company's investment in Enable Midstream Partners, LP (Enable) through wholly owned subsidiaries and ultimately OGE Holdings. Enable is primarily engaged in the business of gathering, processing, transporting and storing natural gas.