UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 May 8, 2024 Date of report (date of earliest event reported) Commission Name of Registrant, State of Incorporation, Address IRS Employer File No. of Principal Executive Offices, and Telephone No. Identification No. MGE Energy, Inc. 000-49965 39-2040501 (a Wisconsin Corporation) 133 South Blair Street Madison, Wisconsin 53788 (608) 252-7000 | m ...