    <SEC-DOCUMENT>0001161728-18-000018-index.html : 20180417
    <SEC-HEADER>0001161728-18-000018.hdr.sgml : 20180417
    <ACCEPTANCE-DATETIME>20180417102049
    ACCESSION NUMBER:		0001161728-18-000018
    CONFORMED SUBMISSION TYPE:	DEFA14A
    PUBLIC DOCUMENT COUNT:		4
    FILED AS OF DATE:		20180417
    DATE AS OF CHANGE:		20180417
    EFFECTIVENESS DATE:		20180417

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			MGE ENERGY INC
    		CENTRAL INDEX KEY:			0001161728
    		STANDARD INDUSTRIAL CLASSIFICATION:	ELECTRIC, GAS & SANITARY SERVICES [4900]
    		IRS NUMBER:				392040501
    		STATE OF INCORPORATION:			WI
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		DEFA14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	000-49965
    		FILM NUMBER:		18758124

    	BUSINESS ADDRESS:
    		STREET 1:		133 SOUTH BLAIR STREET
    		STREET 2:		P.O. BOX 1231
    		CITY:			MADISON
    		STATE:			WI
    		ZIP:			53701-1231
    		BUSINESS PHONE:		(608) 252-7000

    	MAIL ADDRESS:
    		STREET 1:		133 SOUTH BLAIR STREET
    		STREET 2:		P.O. BOX 1231
    		CITY:			MADISON
    		STATE:			WI
    		ZIP:			53701-1231
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>DEFA14A
    <SEQUENCE>1
    <FILENAME>f20180417_14a.htm
    <DESCRIPTION>FORM DEFA14A
    <TEXT>
    Document 1 - file: f20180417_14a.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>f20180417_14a001.jpg
    <TEXT>
    Document 2 - file: f20180417_14a001.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>f20180417_14a002.jpg
    <TEXT>
    Document 3 - file: f20180417_14a002.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>DEFA14A
    <SEQUENCE>4
    <FILENAME>f20180417_14a.pdf
    <DESCRIPTION>FORM DEFA14A PDF
    <TEXT>
    Document 4 - file: f20180417_14a.pdf

    </DOCUMENT>
    </SEC-DOCUMENT>