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. It operates in two segments, Electric Utility and Natural Gas Midstream Operations. The Electric Utility segment generates, transmits, distributes, and sells electric energy. 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, wind-powered, and solar-powered generating assets. Its service area covers 30,000 square miles in Oklahoma and western Arkansas, including Oklahoma City in Oklahoma; and Fort Smith, Arkansas. The Natural Gas Midstream Operations segment engages in gathering, processing, transporting, and storing natural gas; and the provision of crude oil gathering services, and interstate and intrastate natural gas pipeline transportation an