MGE Energy Issues December 2012 'Interim Report'13:59 EST Monday, December 17, 2012 MADISON, Wis. (Business Wire) -- MGE Energy, Inc. (Nasdaq: MGEE) today published its investor newsletter Interim Report with the following topics: - Third-quarter earnings increase - MGE: Top in electric reliability - 2012 IRS cost-basis reporting changes - MGE earns DNR's top Green Tier status - Shareholder updates The newsletter is available on MGE Energy's website at http://www.mgeenergy.com/interimreport. Interim Report is published quarterly to provide investors with information about MGE Energy, its primary subsidiary Madison Gas and Electric and its service area. MGE Energy is an investor-owned public utility holding company headquartered in the state capital of Madison, Wis. It is the parent company of Madison Gas and Electric, which generates and distributes electricity in Dane County, Wis., and purchases and distributes natural gas in seven south-central and western Wisconsin counties. MGE Energy's assets total approximately $1.5 billion. It has 712 employees, more than 36,000 stockholders of record and its 2011 revenues were $546 million. MGE Energy, Inc.Investor relations contactKen Frassetto, 608-252-4723Fax: 608-252-7098kfrassetto@mge.comorMedia contactSteve Kraus, 608-252-7907Manager - Media RelationsFax: 608-252-7098skraus@mge.com