MGE Energy, Inc., through its subsidiaries, operates as a public utility holding company in Wisconsin. The company engages in the generation, purchase, transmission, and distribution of electricity; and purchase and distribution of natural gas. It generates electricity from coal, natural gas, fuel oil, and renewable sources, as well as purchases power under short and long-term commitments. The company owns gas fired combustion turbines that have a total of 156 megawatt (MW) net summer rated capacity; 30 MW consisting of 18 turbines in a wind-powered electric generating facility; and 11 MW consisting of 17 turbines in a wind-powered electric generating facility. It primarily serves residential, commercial, and industrial customers, as well as public authorities, other utilities, and power marketers. As of August 7, 2012, the company generated and distributed electricity to 139,000 customers in Dane County, Wisconsin; and purchased and distributed natural gas to 144,000 customers in 7 south-central and western Wisconsin counties. It also invests in companies engaged in the provision of electric transmission services. MGE Energy, Inc. was founded in 1855 and is headquartered in Madison, Wisconsin.