OGE Energy Corp., together with its subsidiaries, operates as an energy and energy services provider that offers physical delivery and related services for electricity, natural gas, crude oil, and natural gas liquids in the United States. The company generates, transmits, distributes, and sells electric energy. It provides retail electric service to approximately 879,000 customers, which covers a service area of approximately 30,000 square miles in Oklahoma and western Arkansas; and owns and operates coal-fired, natural gas-fired, wind-powered, and solar-powered generating assets.