MGE Energy, Inc. is a public utility holding company in the United States. It operates through segments including Regulated Electric Utility Operations, Regulated Gas Utility Operations, Nonregulated Energy Operations, Transmission Investments, and All Other. The company generates, purchases, and distributes electricity and natural gas, owns and leases electric generating capacity, and plans, constructs, operates, maintains, and expands transmission facilities. It also generates electricity from coal-fired, gas-fired, and renewable sources and provides solar and wind generation and battery storage services. As of December 31, 2025, it owned and operated 811 miles of overhead electric distribution lines, 1,386 miles of underground electric distribution cables, 47 substations with an installed capacity of 1.2 million kVA, and gas facilities including 3,117 miles of distribution mains, and supplied electric service to approximately 170,000 customers. MGE Energy has a strategic partnership with Realta Fusion Inc. and Madison Gas and Electric Company. It was incorporated in 2001 and is headquartered in Madison, Wisconsin.