Public Service Enterprise Group Incorporated, through its subsidiaries, operates as an energy company primarily in the northeastern and mid Atlantic United States. The company operates nuclear, coal, gas, and oil-fired generation facilities with a generation capacity of approximately 13,226 megawatts. It sells electricity, natural gas, capacity, emissions credits, and a series of energy-related products that are used to optimize the operation of the energy grid. The company also engages in the transmission of electricity; and distribution of electricity and natural gas to residential, commercial, and industrial customers, as well as invests in the development of solar generation projects, and implements demand response and energy efficiency programs. In addition, it offers appliance services and repairs to customers. As of December 31, 2012, the company owned and operated approximately 17,713 miles of gas mains, and 12 gas distribution headquarters and 2 subheadquarters, as well as 62 natural gas metering and regulating stations. Public Service Enterprise Group Incorporated was founded in 1985 and is headquartered in Newark, New Jersey.