Madison Gas and Electric Co: Declares regular dividend

Stephen R. Kraus
Manager – Media Relations
Madison Gas and Electric Co.

Madison, Wis., May 21, 2013—The board of directors of MGE Energy, Inc. (Nasdaq: MGEE) today declared the regular quarterly dividend of $0.3951 per
share on the outstanding shares of the company’s common stock, payable June 15, 2013, to shareholders of record at the close of business June 1, 2013.

MGE Energy has increased its dividend annually for the past 37 years and has paid cash dividends for more than 100 years.

About MGE Energy

MGE Energy is a public utility holding company. Its principal subsidiary, Madison Gas and Electric (MGE), generates and distributes electricity to
140,000 customers in Dane County, Wis., and purchases and distributes natural gas to 145,000 customers in seven south-central and western
Wisconsin counties. MGE’s roots in the Madison area date back more than 150 years.