MGE Energy, Inc., through its subsidiaries, operates as a public utility holding company primarily in Wisconsin. It operates through Regulated Electric Utility Operations Regulated Gas Utility Operations Nonregulated Energy Operations Transmission Investments and All Other. The company generates, purchases, and distributes electricity owns or leases electric generation facilities located in Wisconsin and Iowa and plans, constructs, operates, maintains, and expands transmission facilities to provide transmission services. It also generates electricity from coal-fired, gas-fired, and renewable energy sources, as well as purchases power under short and long-term commitments. As of December 31, 2021, the company generated and distributed electricity to 159,000 customers in Dane County, Wisconsin and purchased and distributed natural gas to 169,000 customers in seven Wisconsin counties. MGE Energy, Inc.is headquartered in Madison, Wisconsin.