MGE Energy, Inc., through its subsidiaries, operates as a public utility holding company in Wisconsin. It operates through five segments: Regulated Electric Utility Operations; Regulated Gas Utility Operations; Nonregulated Energy Operations; Transmission Investments; and All Other. The company generates, purchases, and distributes electricity, as well as owns or leases electric generation facilities located in Wisconsin and Iowa; and plans, constructs, operates, and maintains transmission facilities to provide transmission services. It generates electricity from coal, natural gas, fuel oil, and wind, as well as purchases power under short and long-term commitments. The company also transports and distributes natural gas in a service area covering 1,678 square miles in seven south-central Wisconsin counties. It serves residential, commercial, and industrial customers, as well as public authorities, other utilities, and power marketers. As of December 31, 2014, the company supplied electric service to approximately 143,000 customers in the cities of Fitchburg, Madison, Middleton, and Monona; and natural gas service to approximately 149,000 customers in the cities of Elroy, Fitchburg, Lodi, Madison, Middleton, Monona, Prairie du Chien, Verona, and Viroqua, as well as 24 villages and 47 townships. MGE Energy, Inc. was founded in 1855 and is based in Madison, Wisconsin.