MGE Energy, Inc. (MGE) is a public utility holding company. The Company operates through five segments: Regulated electric utility operations; Regulated gas utility operations; Nonregulated energy operations; Transmission investments, and All other. The Regulated electric utility operations segment is engaged in generating, purchasing and distributing electricity through Madison Gas and Electric Company (MGE). The Regulated gas utility operations segment is engaged in purchasing and distributing natural gas through MGE. The Nonregulated energy operations segment is engaged in owning and leasing electric generating capacity that assists MGE through MGE Energy's subsidiaries MGE Power Elm Road, LLC and MGE Power West Campus, LLC. The Transmission investments segment represents its investment in American Transmission Company LLC and ATC Holdco, LLC. The All other segment is engaged in investing and financing in companies and property that relate to the regulated operations.