MGEE / MGE Energy, Inc. - SEC 보고서, 연례 보고, 기업 사업 설명서

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

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 19, 2026 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE Ene

EX-99.1

[Signature Page to Forward Sale Agreement]

Exhibit 10.3 May 6, 2026 To: MGE Energy, Inc. 133 South Blair Street Madison, Wisconsin 53788 From: JPMorgan Chase Bank, National Association 270 Park Avenue New York, NY 10017-2014 Ladies and Gentlemen, The purpose of this letter agreement (this “Confirmation”) is to confirm the terms and conditions of the transaction entered into between Party A and Party B on the Trade Date specified below (the

EX-99.1

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

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, 2026 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE Ener

[Signature Page to Forward Sale Agreement]

Exhibit 10.2 May 6, 2026 To: MGE Energy, Inc. 133 South Blair Street Madison, Wisconsin 53788 From: Bank of America, N.A. One Bryant Park, 8th Fl. New York, NY 10036 Ladies and Gentlemen, The purpose of this letter agreement (this “Confirmation”) is to confirm the terms and conditions of the transaction entered into between Party A and Party B on the Trade Date specified below (the “Transaction”).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

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, 2026 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE Ener

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

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 6, 2026 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE Ener

3,300,331 Shares MGE ENERGY, INC. COMMON STOCK ($1.00 PAR VALUE PER SHARE) UNDERWRITING AGREEMENT

Exhibit 1.1 3,300,331 Shares MGE ENERGY, INC. COMMON STOCK ($1.00 PAR VALUE PER SHARE) UNDERWRITING AGREEMENT May 6, 2026 May 6, 2026 To the Managers named in Schedule I hereto for the Underwriters named in Schedule II hereto To the Forward Sellers, named in Schedule I hereto To the Forward Purchasers, named in Schedule I hereto, solely as recipients, and/or beneficiaries of certain representation

[Signature Page to Forward Sale Agreement]

Exhibit 10.1 May 6, 2026 To: MGE Energy, Inc. 133 South Blair Street Madison, Wisconsin 53788 From: Morgan Stanley & Co. LLC 1585 Broadway, 6th Floor New York, NY 10036 Ladies and Gentlemen, The purpose of this letter agreement (this “Confirmation”) is to confirm the terms and conditions of the transaction entered into between Party A and Party B on the Trade Date specified below (the “Transaction

Calculation of Filing Fee Tables 424(b)(5) (Form Type) MGE Energy, Inc. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities

EXHIBIT 107 Calculation of Filing Fee Tables 424(b)(5) (Form Type) MGE Energy, Inc.

MGE Energy, Inc. 3,300,331 Shares Common Stock

Filed Pursuant to Rule 424(b)(5) Registration Statement No. 333-293693 Prospectus Supplement (To Prospectus dated February 24, 2026) MGE Energy, Inc. 3,300,331 Shares Common Stock We are offering 990,099 shares of our common stock, par value $1 per share (the “common stock”), in this offering. In addition, we have entered into separate forward sale agreements with each of Morgan Stanley & Co. LLC,

Subject to Completion Preliminary Prospectus Supplement dated May 6, 2026

The information contained in this preliminary prospectus supplement is not complete and may be changed.

Filing Format Forward-Looking Statements Where to Find More Information

United States SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended: March 31, 2026 ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. Name of Registrant, State of Incorpo

MGE Energy, Inc. (In thousands, except per-share amounts)

EXHIBIT 99.1 News MGE Energy Reports First-Quarter 2026 Earnings Madison, Wis., May 05, 2026—MGE Energy, Inc. (Nasdaq: MGEE), today reported financial results for the first quarter of 2026. MGE Energy's GAAP (Generally Accepted Accounting Principles) earnings for the first quarter of 2026 were $48.5 million, or $1.32 per share, compared to $41.6 million, or $1.14 per share, for the same period in

MGE Energy, Inc. (In thousands, except per-share amounts)

EXHIBIT 99.1 News MGE Energy Reports First-Quarter 2026 Earnings Madison, Wis., May 05, 2026—MGE Energy, Inc. (Nasdaq: MGEE), today reported financial results for the first quarter of 2026. MGE Energy's GAAP (Generally Accepted Accounting Principles) earnings for the first quarter of 2026 were $48.5 million, or $1.32 per share, compared to $41.6 million, or $1.14 per share, for the same period in

Filing Format Forward-Looking Statements Where to Find More Information

United States SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended: March 31, 2026 ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. Name of Registrant, State of Incorpo

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

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 5, 2026 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE Ener

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

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 5, 2026 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE Ener

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by registrant: ☒ Filed by a Party other than the Registrant: ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Definitive Proxy Stateme

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

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 April 17, 2026 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE E

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

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 April 17, 2026 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE E

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by registrant: ☒ Filed by a Party other than the Registrant: ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Definitive Proxy Stateme

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by registrant: ☒ Filed by a Party other than the Registrant: ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Definitive Proxy Stateme

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for a dynamic world 2025 Annual Report FUTURE-FORWARD ENERGY1 MGE Energy (MGEE) Year at a Glance (Thousands, except per-share amounts and shares outstanding) 2025 2024 Increase/ (Decrease) % Change Total Market Value (Dec.

Business Overview Election of Directors Governance Snapshot Risk Assessment and Oversight Shareholder Engagement and Outreach Corporate Responsibility and Sustainability Board of Directors Information Beneficial Ownership Ratification of Price

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by registrant: ☒ Filed by a Party other than the Registrant: ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☒ Definitive Proxy Stateme

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

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 February 27, 2026 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MG

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

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 February 27, 2026 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MG

EX-99.1

EX-99.1

MGE Energy, Inc. (In thousands, except per-share amounts)

EXHIBIT 99.1 News MGE Energy Reports Fourth-Quarter and Full-Year 2025 Earnings Madison, Wis., Feb. 24, 2026—MGE Energy, Inc. (Nasdaq: MGEE), today reported financial results for the fourth quarter and full year of 2025. MGE Energy's GAAP (Generally Accepted Accounting Principles) earnings for the full year of 2025 were $135.9 million, or $3.72 per share, compared to $120.6 million, or $3.33 per s

MGE ENERGY, INC. INSIDER STOCK TRADING POLICY

EXHIBIT 19.1 MGE ENERGY, INC. INSIDER STOCK TRADING POLICY This Policy is intended to elaborate on, and to explain several important considerations underlying, the provisions of our Code of Ethics restricting the purchase or sale of Company securities based on confidential or insider information. “We,” “our” and “Company” refer to MGE Energy, Inc. and its subsidiaries. Our common stock is publicly

For purposes of this opinion letter, we have assumed that, at the time of the issuance, sale and delivery of each series of Notes, (i) the Company will have authorized the execution, delivery and performance of said series of Notes, that said authori

Exhibit 5.3 February 24, 2026 Madison Gas and Electric Company 133 South Blair Street Madison, Wisconsin 53788 Ladies and Gentlemen: We refer to the Registration Statement on Form S-3 (the “Registration Statement”) being filed by MGE Energy, Inc., a Wisconsin corporation, and Madison Gas and Electric Company, a Wisconsin corporation (the “Company”) with the Securities and Exchange Commission (“Com

MGE ENERGY, INC. RISK FACTORS SUMMARY OF THE PLAN USE OF PROCEEDS DESCRIPTION OF THE PLAN DESCRIPTION OF COMMON STOCK COMMON STOCK DIVIDENDS AND MARKET PLAN OF DISTRIBUTION LEGAL MATTERS EXPERTS WHERE YOU CAN FIND MORE INFORMATION

As filed with the United States Securities and Exchange Commission on February 24, 2026 Registration No.

MGE Energy, Inc. DESCRIPTION OF COMMON STOCK

EXHIBIT 4.2 MGE Energy, Inc. DESCRIPTION OF COMMON STOCK MGE Energy, Inc.'s (the "Company") common stock, $1 par value per share, is registered under Section 12(b) of the Securities Exchange Act of 1934, as amended, and is traded on the Nasdaq Stock Market. The Company's authorized stock presently consists solely of common stock. The summary of the general terms and provisions of the Company's com

(a) The Company agrees to indemnify and hold harmless each Manager, each person, if any, who controls any Manager within the meaning of either Section 15 of the Securities Act or Section 20 of the Exchange Act and each affiliate of any Manager within

Exhibit 1.1 MGE ENERGY, INC. COMMON STOCK ($1.00 PAR VALUE PER SHARE) EQUITY DISTRIBUTION AGREEMENT February 24, 2026 February 24, 2026 Guggenheim Securities, LLC Morgan Stanley & Co. LLC c/o Guggenheim Securities, LLC 330 Madison Avenue New York, NY 10017 c/o Morgan Stanley & Co. LLC 1585 Broadway New York, New York 10036 Ladies and Gentlemen: MGE Energy, Inc., a Wisconsin corporation (the “Compa

ARTICLE 1 DEFINITIONS ARTICLE 2 THE SECURITIES ARTICLE 3 REDEMPTION ARTICLE 4 COVENANTS ARTICLE 5 SUCCESSORS ARTICLE 6 DEFAULTS AND REMEDIES ARTICLE 7 TRUSTEE ARTICLE 8 DISCHARGE OF INDENTURE ARTICLE 9 [Reserved.] ARTICLE 10 AMENDMENTS ARTICLE 11 MIS

Exhibit 4.3 MGE ENERGY, INC. DEBT SECURITIES INDENTURE DATED AS OF [], [] [], AS TRUSTEE PARTIAL CROSS-REFERENCE TABLE INDENTURE SECTION TIA SECTION 2.04 317(b) 2.05 312(a), 313(c) 2.10 316(a) (last sentence) 4.04 314(a)(1) 6.03 317(a)(1) 6.04 316(a)(1)(B) 6.05 316(a)(1)(A) 6.07 317(a)(1) 7.01 315(a), 315(d) 7.04 315(b) 7.05 313(a), 313(d) 7.07 310(a), 310(b) 7.09 310(a)(2) 8.02 310(a), 310(b) 10.

= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DES

Exhibit 25.2 = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b)(2) || THE BANK OF NEW

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

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 February 24, 2026 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MG

Calculation of Filing Fee Tables Form S-3 (Form Type) MGE Energy, Inc. (Exact Name of Registrant as Specified in its Charter) Not Applicable (Translation of Registrant’s Name into English) Table 1: Newly Registered and Carry Forward Securities

EXHIBIT 107 Calculation of Filing Fee Tables Form S-3 (Form Type) MGE Energy, Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

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 February 24, 2026 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MG

Up to $100,000,000 MGE Energy, Inc. Common Stock

Filed Pursuant to Rule 424(b)(5) Registration Statement No. 333-293693 Prospectus Supplement (To Prospectus dated February 24, 2026) Up to $100,000,000 MGE Energy, Inc. Common Stock We have entered into an equity distribution agreement (the “Equity Distribution Agreement”) with Guggenheim Securities, LLC and Morgan Stanley & Co. LLC, as sales agents and/or principals (each, a “Manager” and, collec

MGE ENERGY, INC. RISK FACTORS SUMMARY OF THE PLAN USE OF PROCEEDS DESCRIPTION OF THE PLAN DESCRIPTION OF COMMON STOCK COMMON STOCK DIVIDENDS AND MARKET PLAN OF DISTRIBUTION LEGAL MATTERS EXPERTS WHERE YOU CAN FIND MORE INFORMATION

As filed with the United States Securities and Exchange Commission on February 24, 2026 Registration No.

= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DES

Exhibit 25.2 = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b)(2) || THE BANK OF NEW

February 24, 2026

Sidley Austin LLP 787 Seventh Avenue New York, NY 10019 +1 212 839 5300 +1 212 839 5599 Fax AMERICA  ASIA PACIFIC  EUROPE Exhibit 5.

Calculation of Filing Fee Tables Form S-3 (Form Type) MGE Energy, Inc. (Exact Name of Registrant as Specified in its Charter) Not Applicable (Translation of Registrant’s Name into English) Table 1: Newly Registered and Carry Forward Securities

EXHIBIT 107 Calculation of Filing Fee Tables Form S-3 (Form Type) MGE Energy, Inc.

Calculation of Filing Fee Tables Form S-3 (Form Type) MGE Energy, Inc. (Exact Name of Registrant as Specified in its Charter) Not Applicable (Translation of Registrant’s Name into English) Table 1: Newly Registered and Carry Forward Securities

EXHIBIT 107 Calculation of Filing Fee Tables Form S-3 (Form Type) MGE Energy, Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

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 February 24, 2026 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MG

MGE Energy, Inc. (In thousands, except per-share amounts)

EXHIBIT 99.1 News MGE Energy Reports Fourth-Quarter and Full-Year 2025 Earnings Madison, Wis., Feb. 24, 2026—MGE Energy, Inc. (Nasdaq: MGEE), today reported financial results for the fourth quarter and full year of 2025. MGE Energy's GAAP (Generally Accepted Accounting Principles) earnings for the full year of 2025 were $135.9 million, or $3.72 per share, compared to $120.6 million, or $3.33 per s

MGE ENERGY, INC. POLICY ON RECOUPMENT OF INCENTIVE COMPENSATION

EXHIBIT 97.1 MGE ENERGY, INC. POLICY ON RECOUPMENT OF INCENTIVE COMPENSATION Introduction The Board of Directors (the “Board”) of MGE Energy, Inc. (the “Company”) has adopted this Policy on Recoupment of Incentive Compensation (this “Policy”), which provides for the recoupment of compensation in certain circumstances in the event of a restatement of financial results by the Company. This Policy sh

ASSET SALE AGREEMENT by and between DAIRYLAND POWER COOPERATIVE MADISON GAS AND ELECTRIC COMPANY February 19, 2026

Execution Version CONFIDENTIAL ASSET SALE AGREEMENT by and between DAIRYLAND POWER COOPERATIVE and MADISON GAS AND ELECTRIC COMPANY February 19, 2026 Table of Contents Page ARTICLE I DEFINITION 1 Section 1.

For purposes of this opinion letter, we have assumed that, at the time of the issuance, sale and delivery of each series of Notes, (i) the Company will have authorized the execution, delivery and performance of said series of Notes, that said authori

Exhibit 5.3 February 24, 2026 Madison Gas and Electric Company 133 South Blair Street Madison, Wisconsin 53788 Ladies and Gentlemen: We refer to the Registration Statement on Form S-3 (the “Registration Statement”) being filed by MGE Energy, Inc., a Wisconsin corporation, and Madison Gas and Electric Company, a Wisconsin corporation (the “Company”) with the Securities and Exchange Commission (“Com

February 24, 2026

Sidley Austin LLP 787 Seventh Avenue New York, NY 10019 +1 212 839 5300 +1 212 839 5599 Fax AMERICA  ASIA PACIFIC  EUROPE Exhibit 5.

ARTICLE 1 DEFINITIONS ARTICLE 2 THE SECURITIES ARTICLE 3 REDEMPTION ARTICLE 4 COVENANTS ARTICLE 5 SUCCESSORS ARTICLE 6 DEFAULTS AND REMEDIES ARTICLE 7 TRUSTEE ARTICLE 8 DISCHARGE OF INDENTURE ARTICLE 9 [Reserved.] ARTICLE 10 AMENDMENTS ARTICLE 11 MIS

Exhibit 4.3 MGE ENERGY, INC. DEBT SECURITIES INDENTURE DATED AS OF [], [] [], AS TRUSTEE PARTIAL CROSS-REFERENCE TABLE INDENTURE SECTION TIA SECTION 2.04 317(b) 2.05 312(a), 313(c) 2.10 316(a) (last sentence) 4.04 314(a)(1) 6.03 317(a)(1) 6.04 316(a)(1)(B) 6.05 316(a)(1)(A) 6.07 317(a)(1) 7.01 315(a), 315(d) 7.04 315(b) 7.05 313(a), 313(d) 7.07 310(a), 310(b) 7.09 310(a)(2) 8.02 310(a), 310(b) 10.

Filing Format Forward-Looking Statements Where to Find More Information PART I. PART II. PART IV.

United States SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended: December 31, 2025 ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. Exact Name of Registrant as Specified in

Subsidiaries of MGE Energy, Inc.

EXHIBIT 21 Subsidiaries of MGE Energy, Inc. As of December 31, 2025, the company held the following subsidiaries (all of which are formed or organized as Wisconsin entities): • Madison Gas and Electric Company – a regulated utility that generates and distributes electricity to approximately 170,000 customers in Dane County, Wisconsin, and purchases and distributes natural gas to approximately 180,

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

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 January 27, 2026 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

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 January 22, 2026 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE

Madison Gas and Electric Company $30,000,000 5.05% Senior Notes, Series A, due January 31, 2036 $30,000,000 5.25% Senior Notes, Series B, due January 31, 2041 $30,000,000 5.79% Senior Notes, Series C, due January 31, 2056 Note Purchase Agreement Date

Execution Version Madison Gas and Electric Company $30,000,000 5.05% Senior Notes, Series A, due January 31, 2036 $30,000,000 5.25% Senior Notes, Series B, due January 31, 2041 $30,000,000 5.79% Senior Notes, Series C, due January 31, 2056 Note Purchase Agreement Dated January 22, 2026 Table of Contents Section Heading Page Section 1. Authorization of Notes 1 Section 2. Sale and Purchase of Notes

EX-99.1

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

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 November 7, 2025 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE

Filing Format Forward-Looking Statements Where to Find More Information

United States SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended: September 30, 2025 ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. Name of Registrant, State of Inc

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

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 November 5, 2025 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE

MGE Energy, Inc. (In thousands, except per-share amounts)

EXHIBIT 99.1 News MGE Energy Reports Third-Quarter 2025 Earnings Madison, Wis., November 05, 2025—MGE Energy, Inc. (Nasdaq: MGEE), today reported financial results for the third quarter of 2025. MGE Energy's GAAP (Generally Accepted Accounting Principles) earnings for the third quarter of 2025 were $44.5 million, or $1.22 per share, compared to $40.9 million, or $1.13 per share, for the same perio

Madison Gas and Electric Company $25,000,000 5.12% Senior Notes, Series A, due November 15, 2036 $25,000,000 5.76% Senior Notes, Series B, due November 15, 2055 Note Purchase Agreement Dated October 14, 2025

Execution Version Madison Gas and Electric Company $25,000,000 5.12% Senior Notes, Series A, due November 15, 2036 $25,000,000 5.76% Senior Notes, Series B, due November 15, 2055 Note Purchase Agreement Dated October 14, 2025 Table of Contents Section Heading Page Section 1. Authorization of Notes 1 Section 2. Sale and Purchase of Notes 1 Section 3. Closing 1 Section 4. Conditions to Closing 2 Sec

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

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 October 14, 2025 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE

1

EXHIBIT 99.1 News MGE Energy Increases Dividend for 50th Consecutive Year Madison, Wis., August 15, 2025—The board of directors of MGE Energy, Inc. (Nasdaq: MGEE), today increased the regular quarterly dividend rate 5.6% to $0.4750 per share on the outstanding shares of the company’s common stock. The dividend is payable Sept. 15, 2025, to shareholders of record Sept. 1, 2025. This raises the annu

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

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 August 15, 2025 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

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 August 6, 2025 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE E

EX-99.2

Filing Format Forward-Looking Statements Where to Find More Information

United States SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended: June 30, 2025 ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. Name of Registrant, State of Incorpor

MGE Energy, Inc. (In thousands, except per-share amounts)

EXHIBIT 99.1 News MGE Energy Reports Second-Quarter 2025 Earnings Madison, Wis., August 06, 2025—MGE Energy, Inc. (Nasdaq: MGEE), today reported financial results for the second quarter of 2025. MGE Energy's GAAP (Generally Accepted Accounting Principles) earnings for the second quarter of 2025 were $26.5 million, or $0.73 per share, compared to $23.8 million, or $0.66 per share, for the same peri

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

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 20, 2025 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE Ene

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

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 16, 2025 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE Ene

EX-99.1

MGE Energy, Inc. (In thousands, except per-share amounts)

EXHIBIT 99.1 News MGE Energy Reports First-Quarter 2025 Earnings Madison, Wis., May 07, 2025—MGE Energy, Inc. (Nasdaq: MGEE), today reported financial results for the first quarter of 2025. MGE Energy's GAAP (Generally Accepted Accounting Principles) earnings for the first quarter of 2025 were $41.6 million, or $1.14 per share, compared to $33.8 million, or $0.93 per share, for the same period in

Financial Statements and Exhibits, Results of Operations and Financial Condition

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 7, 2025 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE Ener

Filing Format Forward-Looking Statements Where to Find More Information

United States SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended: March 31, 2025 ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. Name of Registrant, State of Incorpo

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by registrant: ☒ Filed by a Party other than the Registrant: ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Definitive Proxy Stateme

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Amendment No. 1 Filed by registrant: ☒ Filed by a Party other than the Registrant: ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☒ Definiti

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by registrant: ☒ Filed by a Party other than the Registrant: ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Definitive Proxy Stateme

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by registrant: ☒ Filed by a Party other than the Registrant: ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☒ Definitive Proxy Stateme

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by registrant: ☒ Filed by a Party other than the Registrant: ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Definitive Proxy Stateme

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by registrant: ☒ Filed by a Party other than the Registrant: ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Definitive Proxy Stateme

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

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 February 21, 2025 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MG

United States SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended: December 31, 2024 ☐ Transition report pursuant to Sect

United States SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended: December 31, 2024 ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. Name of Registrant, State of Incorporatio

Subsidiaries of MGE Energy, Inc.

EXHIBIT 21 Subsidiaries of MGE Energy, Inc. As of December 31, 2024, the company held the following subsidiaries (all of which are formed or organized as Wisconsin entities): • Madison Gas and Electric Company – a regulated utility that generates and distributes electricity to approximately 167,000 customers in Dane County, Wisconsin, and purchases and distributes natural gas to approximately 178,

MGE Energy, Inc. (In thousands, except per-share amounts)

EXHIBIT 99.1 News MGE Energy Reports Fourth-Quarter and Full-Year 2024 Earnings Madison, Wis., Feb. 25, 2025—MGE Energy, Inc. (Nasdaq: MGEE), today reported financial results for the fourth quarter and full year of 2024. MGE Energy's GAAP (Generally Accepted Accounting Principles) earnings for the full year of 2024 were $120.6 million, or $3.33 per share, compared to $117.7 million, or $3.25 per s

MGE ENERGY, INC. INSIDER STOCK TRADING POLICY

EXHIBIT 19.1 MGE ENERGY, INC. INSIDER STOCK TRADING POLICY This Policy is intended to elaborate on, and to explain several important considerations underlying, the provisions of our Code of Ethics restricting the purchase or sale of Company securities based on confidential or insider information. “We,” “our” and “Company” refer to MGE Energy, Inc. and its subsidiaries. Our common stock is publicly

Regulation FD Disclosure, Financial Statements and Exhibits

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 February 25, 2025 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MG

Financial Statements and Exhibits, Results of Operations and Financial Condition

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 February 25, 2025 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MG

EX-99.1

MGE ENERGY, INC. POLICY ON RECOUPMENT OF INCENTIVE COMPENSATION

EXHIBIT 97.1 MGE ENERGY, INC. POLICY ON RECOUPMENT OF INCENTIVE COMPENSATION Introduction The Board of Directors (the “Board”) of MGE Energy, Inc. (the “Company”) has adopted this Policy on Recoupment of Incentive Compensation (this “Policy”), which provides for the recoupment of compensation in certain circumstances in the event of a restatement of financial results by the Company. This Policy sh

Wisconsin energy companies announce plan to continue operations at Columbia Energy Center, commit to exploring conversion to natural gas

Wisconsin energy companies announce plan to continue operations at Columbia Energy Center, commit to exploring conversion to natural gas This necessary next step furthers reliability, supports customer growth and maintains affordability while continuing to advance co-owners’ sustainability goals.

Regulation FD Disclosure, Financial Statements and Exhibits

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 December 4, 2024 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE

MGEE / MGE Energy, Inc. / T. Rowe Price Investment Management, Inc. Passive Investment

SC 13G/A 1 mgee13gasep24.txt UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1) MGE ENERGY INC (Name of Issuer) COMMON STOCK (Title of Class of Securities) 55277P104 (CUSIP NUMBER) September 30, 2024 (Date of Event which Requires Filing of Statement) Check the appropriate box to designate the Rule pursuan

MGEE / MGE Energy, Inc. / VANGUARD GROUP INC Passive Investment

SC 13G/A 1 UnitedStates13GMGEEnergyI.txt 240.13d-102 Schedule 13G - Information to be included in statements filed pursuant to 240.13d-1(b), (c), and (d) and amendments thereto filed pursuant to 240.13d-2. Securities and Exchange Commission, Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No. 16)* (Name of Issuer) MGE Energy Inc (Title of Class of Securitie

Regulation FD Disclosure, Financial Statements and Exhibits

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 November 8, 2024 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE

EX-99.1

United States SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended: September 30, 2024 ☐ Transition Report Pursuan

United States SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended: September 30, 2024 ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. Name of Registrant, State of Inc

EX-99.1

MGE Energy, Inc. (In thousands, except per-share amounts)

EXHIBIT 99.1 News MGE Energy Reports Third-Quarter 2024 Earnings Madison, Wis., Nov. 6, 2024—MGE Energy, Inc. (Nasdaq: MGEE), today reported financial results for the third quarter of 2024. MGE Energy's GAAP (Generally Accepted Accounting Principles) earnings for the third quarter of 2024 were $40.9 million, or $1.13 per share, compared to $37.9 million, or $1.05 per share, for the same period in

Financial Statements and Exhibits, Results of Operations and Financial Condition

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 November 6, 2024 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE

Regulation FD Disclosure, Financial Statements and Exhibits

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 November 6, 2024 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

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 October 31, 2024 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE

Madison Gas and Electric Company $25,000,000 5.30% Senior Notes, Series A, due December 1, 2039 $25,000,000 5.59% Senior Notes, Series B, due December 1, 2054 Note Purchase Agreement Dated October 31, 2024 Table of Contents

Execution Version Madison Gas and Electric Company $25,000,000 5.30% Senior Notes, Series A, due December 1, 2039 $25,000,000 5.59% Senior Notes, Series B, due December 1, 2054 Note Purchase Agreement Dated October 31, 2024 Table of Contents Section Heading Page Section 1. Authorization of Notes 1 Section 2. Sale and Purchase of Notes 1 Section 3. Closing 2 Section 4. Conditions to Closing 2 Secti

MGEE / MGE Energy, Inc. / VANGUARD GROUP INC Passive Investment

240.13d-102 Schedule 13G - Information to be included in statements filed pursuant to 240.13d-1(b), (c), and (d) and amendments thereto filed pursuant to 240.13d-2. Securities and Exchange Commission, Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No. 15)* (Name of Issuer) MGE Energy Inc (Title of Class of Securities) Common Stock (CUSIP Number) 55277P104

Financial Statements and Exhibits, Other Events

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 August 16, 2024 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE

1

EXHIBIT 99.1 News MGE Energy Increases Dividend for 49th Consecutive Year Madison, Wis., August 16, 2024—The board of directors of MGE Energy, Inc. (Nasdaq: MGEE), today increased the regular quarterly dividend rate 5.3% to $0.45 per share on the outstanding shares of the company's common stock. The dividend is payable Sept. 15, 2024, to shareholders of record Sept. 1, 2024. This raises the annual

United States SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended: June 30, 2024 ☐ Transition Report Pursuant to

United States SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended: June 30, 2024 ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. Name of Registrant, State of Incorpor

DISABILITY INCOME INSURANCE POLICY

Platinum Advantage Insurance Policy NAME 1 Standard Insurance Company INSURED: NAME POLICY NUMBER: DISABILITY INCOME INSURANCE POLICY This is a non-participating Disability Income Insurance Policy.

Regulation FD Disclosure, Financial Statements and Exhibits

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 August 7, 2024 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE E

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

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 August 7, 2024 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE E

MGE Energy, Inc. (In thousands, except per-share amounts)

EXHIBIT 99.1 News MGE Energy Reports Second-Quarter 2024 Earnings Madison, Wis., August 07, 2024—MGE Energy, Inc. (Nasdaq: MGEE), today reported financial results for the second quarter of 2024. MGE Energy's GAAP (Generally Accepted Accounting Principles) earnings for the second quarter of 2024 were $23.8 million, or $0.66 per share, compared to $28.7 million, or $0.79 per share, for the same peri

EX-99.1

Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

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 21, 2024 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE Ene

EX-99.1

Regulation FD Disclosure, Financial Statements and Exhibits

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 9, 2024 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE Ener

MGE Energy, Inc. (In thousands, except per-share amounts)

EXHIBIT 99.1 News MGE Energy Reports First-Quarter 2024 Earnings Madison, Wis., May 08, 2024—MGE Energy, Inc. (Nasdaq: MGEE), today reported financial results for the first quarter of 2024. MGE Energy's GAAP (Generally Accepted Accounting Principles) earnings for the first quarter of 2024 were $33.8 million, or $0.93 per share, compared to $31.1 million, or $0.86 per share, for the same period in

Financial Statements and Exhibits, Results of Operations and Financial Condition

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 File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE Ener

United States SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended: March 31, 2024 ☐ Transition Report Pursuant to

United States SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended: March 31, 2024 ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. Name of Registrant, State of Incorpo

Additional information mailed to MGE Energy shareholders on or about April 24, 2024.

Additional information mailed to MGE Energy shareholders on or about April 24, 2024.

ARS

for a strong energy future Annual Report 20231 MGE Energy (MGEE) Year at a Glance (Thousands, except per-share amounts and shares outstanding) 2023 2022 Increase/ (Decrease) % Change Total Market Value (Dec.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by registrant: ☒ Filed by a Party other than the Registrant: ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☒ Definitive Proxy Stateme

MGEE / MGE Energy, Inc. / BlackRock Inc. Passive Investment

SC 13G/A 1 us55277p1049040424.txt us55277p1049040424.txt SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No: 15) MGE ENERGY INC - (Name of Issuer) Common Stock - (Title of Class of Securities) 55277P104 - (CUSIP Number) March 31, 2024 - (Date of Event Which Requires Filing of this Statement) Check the appropriate box to de

Additional information mailed to MGE Energy shareholders on or about April 5, 2024.

Additional information mailed to MGE Energy shareholders on or about April 5, 2024.

Our world is increasingly connected… with energy powering those connections.

The following is a transcription of Chairman, President and CEO Jeffrey Keebler's video message prepared by MGE Energy, Inc.

Additional information mailed to MGE Energy shareholders on or about April 5, 2024.

Additional information mailed to MGE Energy shareholders on or about April 5, 2024.

MGEE / MGE Energy, Inc. / MILLENNIUM MANAGEMENT LLC Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 MGE ENERGY, INC. (Name of Issuer) COMMON STOCK, PAR VALUE $1.00 PER SHARE (Title of Class of Securities) 55277P104 (CUSIP Number) MARCH 14, 2024 (Date of event which requires filing of this statement) Check the appropriate box to designate the rule pursuant to which this S

United States SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended: December 31, 2023 ☐ Transition report pursuant to Sect

United States SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended: December 31, 2023 ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. Name of Registrant, State of Incorporatio

Subsidiaries of MGE Energy, Inc.

EXHIBIT 21 Subsidiaries of MGE Energy, Inc. As of December 31, 2023, the company held the following subsidiaries (all of which are formed or organized as Wisconsin entities): • Madison Gas and Electric Company – a regulated utility that generates and distributes electricity to approximately 163,000 customers in Dane County, Wisconsin, and purchases and distributes natural gas to approximately 176,

Insider Trading Policies and Procedures

EXHIBIT 19.1 MGE ENERGY, INC. INSIDER STOCK TRADING POLICY This Policy is intended to elaborate on, and to explain several important considerations underlying, the provisions of our Code of Ethics restricting the purchase or sale of Company securities based on confidential or insider information. “We,” “our” and “Company” refer to MGE Energy, Inc. and its subsidiaries. Our common stock is publicly

Policy on Recoupment of Incentive Compensation

EXHIBIT 97.1 MGE ENERGY, INC. POLICY ON RECOUPMENT OF INCENTIVE COMPENSATION Introduction The Board of Directors (the “Board”) of MGE Energy, Inc. (the “Company”) has adopted this Policy on Recoupment of Incentive Compensation (this “Policy”), which provides for the recoupment of compensation in certain circumstances in the event of a restatement of financial results by the Company. This Policy sh

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

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 February 16, 2024 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MG

Regulation FD Disclosure, Financial Statements and Exhibits

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 February 21, 2024 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MG

Financial Statements and Exhibits, Results of Operations and Financial Condition

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 February 21, 2024 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MG

MGE Energy, Inc. (In thousands, except per-share amounts)

EXHIBIT 99.1 News MGE Energy Reports Fourth-Quarter and Full-Year 2023 Earnings Madison, Wis., Feb. 21, 2024—MGE Energy, Inc. (Nasdaq: MGEE), today reported financial results for the fourth quarter and full year of 2023. MGE Energy's GAAP (Generally Accepted Accounting Principles) earnings for the full year of 2023 were $117.7 million, or $3.25 per share, compared to $111.0 million, or $3.07 per s

EX-99.1

MGEE / MGE Energy, Inc. / T. Rowe Price Investment Management, Inc. Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. ) MGE ENERGY INC (Name of Issuer) COMMON STOCK (Title of Class of Securities) 55277P104 (CUSIP NUMBER) December 31, 2023 (Date of Event which Requires Filing of Statement) Check the appropriate box to designate the Rule pursuant to which this Schedule is fil

MGEE / MGE Energy, Inc. / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SC 13G/A 1 tv0092-mgeenergyinc.htm SCHEDULE 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 14)* Name of issuer: MGE Energy Inc Title of Class of Securities: Common Stock CUSIP Number: 55277P104 Date of Event Which Requires Filing of this Statement: December 29, 2023 Check the appropriate box to designate the ru

MGEE / MGE Energy, Inc. / BlackRock Inc. Passive Investment

SC 13G/A 1 us55277p1049012524.txt us55277p1049012524.txt SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No: 14) MGE ENERGY INC - (Name of Issuer) Common Stock - (Title of Class of Securities) 55277P104 - (CUSIP Number) December 31, 2023 - (Date of Event Which Requires Filing of this Statement) Check the appropriate box to

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

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 December 15, 2023 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MG

Regulation FD Disclosure, Financial Statements and Exhibits

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 November 08, 2023 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MG

EX-99.1

Financial Statements and Exhibits, Results of Operations and Financial Condition

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 November 2, 2023 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE

EX-99.1

1 MGE Energy, Inc. (In thousands, except per-share amounts)

EXHIBIT 99.1 News MGE Energy Reports Third-Quarter 2023 Earnings Madison, Wis., Nov. 02, 2023—MGE Energy, Inc. (Nasdaq: MGEE), today reported financial results for the third quarter of 2023. MGE Energy's GAAP (Generally Accepted Accounting Principles) earnings for the third quarter of 2023 were $37.9 million, or $1.05 per share, compared to $33.7 million, or $0.93 per share, for the same period in

Regulation FD Disclosure, Financial Statements and Exhibits

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 November 2, 2023 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE

United States SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended: September 30, 2023 ☐ Transition Report Pursuan

United States SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended: September 30, 2023 ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. Name of Registrant, State of Inc

Amended and Restated Bylaws of MGE Energy, Inc.

Exhibit 3.1 Amended and Restated Bylaws of MGE Energy, Inc. (a Wisconsin Corporation) September , 2023 Table of Contents Article I. Offices 1 1.01 Principal and Business Offices. 1 1.02 Registered Office. 1 Article II. Shareholders 1 2.01 Annual Meeting. 1 2.02 Special Meeting. 1 2.03 Place of Meeting. 5 2.04 Notice of Meeting. 5 2.05 Closing of Stock Transfer Records or Fixing of Record Date. 6 2

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits

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 September 15, 2023 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 M

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

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 August 31, 2023 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE

$40,000,000 5.61% Senior Notes, Series A, due September 15, 2034 $30,000,000 5.91% Senior Notes, Series B, due December 1, 2053 Note Purchase Agreement Dated August 31, 2023 Table of Contents

Execution Version Exhibit 4.1 Madison Gas and Electric Company $40,000,000 5.61% Senior Notes, Series A, due September 15, 2034 $30,000,000 5.91% Senior Notes, Series B, due December 1, 2053 Note Purchase Agreement Dated August 31, 2023 Table of Contents Section Heading Page Section 1. Authorization of Notes 1 Section 2. Sale and Purchase of Notes 1 Section 3. Closing 2 Section 4. Conditions to Cl

Financial Statements and Exhibits, Other Events

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 August 18, 2023 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE

1

EXHIBIT 99.1 News MGE Energy Increases Dividend for 48th Consecutive Year Madison, Wis., August 18, 2023—The board of directors of MGE Energy, Inc. (Nasdaq: MGEE), today increased the regular quarterly dividend rate approximately 5% to $0.4275 per share on the outstanding shares of the company's common stock. The dividend is payable Sept. 15, 2023, to shareholders of record Sept. 1, 2023. This rai

Regulation FD Disclosure, Financial Statements and Exhibits

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 August 4, 2023 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE E

EX-99.1

MGE Energy, Inc. (In thousands, except per-share amounts)

EXHIBIT 99.1 News MGE Energy Reports Second-Quarter 2023 Earnings Madison, Wis., Aug. 03, 2023—MGE Energy, Inc. (Nasdaq: MGEE), today reported financial results for the second quarter of 2023. MGE Energy's GAAP (Generally Accepted Accounting Principles) earnings for the second quarter of 2023 were $28.7 million, or $0.79 per share, compared to $21.8 million, or $0.60 per share, for the same period

United States SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended: June 30, 2023 ☐ Transition Report Pursuant to

United States SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended: June 30, 2023 ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. Name of Registrant, State of Incorpor

Financial Statements and Exhibits, Results of Operations and Financial Condition

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 August 3, 2023 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE E

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

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 16, 2023 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE Ene

Calculation of Filing Fee Tables Form S-3 (Form Type) MGE Energy, Inc. (Exact Name of Registrant as Specified in its Charter) Not Applicable (Translation of Registrant’s Name into English) Table 1: Newly Registered and Carry Forward Securities

EX-FILING FEES 13 ex107.htm EXHIBIT 107 EX-FILING FEES EXHIBIT 107 Calculation of Filing Fee Tables Form S-3 (Form Type) MGE Energy, Inc. (Exact Name of Registrant as Specified in its Charter) Not Applicable (Translation of Registrant’s Name into English) Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registere

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-3 Registration Statement Under the Securities Act of 1933

Form S-3 (ASR) Registration No. 333- Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-3 Registration Statement Under the Securities Act of 1933 MGE Energy, Inc. (Exact name of registrant as specified in its charter) Madison Gas and Electric Company (Exact name of registrant as specified in its charter) Wisconsin (State or other jurisdiction of in

= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION D

EXHIBIT 25.1 = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b)(2) || THE BANK OF NE

Regulation FD Disclosure, Financial Statements and Exhibits

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 5, 2023 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE Ener

EX-99

Financial Statements and Exhibits, Results of Operations and Financial Condition

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 4, 2023 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE Ener

United States SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended: March 31, 2023 ☐ Transition Report Pursuant to

United States SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended: March 31, 2023 ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. Name of Registrant, State of Incorpo

MGE Energy, Inc. (In thousands, except per-share amounts)

EXHIBIT 99.1 News MGE Energy Reports First-Quarter 2023 Earnings Madison, Wis., May 04, 2023—MGE Energy, Inc. (Nasdaq: MGEE), today reported financial results for the first quarter of 2023. MGE Energy's GAAP (Generally Accepted Accounting Principles) earnings for the first quarter of 2023 were $31.1 million, or $0.86 per share, compared to $34.4 million, or $0.95 per share, for the same period in

Reminder to vote information mailed to MGE Energy shareholders on or about April 24, 2023.

Reminder to vote information mailed to MGE Energy shareholders on or about April 24, 2023.

Additional information mailed to MGE Energy shareholders on or about March 29, 2023.

Additional information mailed to MGE Energy shareholders on or about March 29, 2023.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by registrant: ☒ Filed by a Party other than the Registrant: ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☒ Definitive Proxy Stateme

1

The following is a transcription of Chairman, President and CEO Jeffrey Keebler's video message prepared by MGE Energy, Inc.

Additional information mailed to MGE Energy shareholders on or about March 29, 2023.

Additional information mailed to MGE Energy shareholders on or about March 29, 2023.

ANNUAL REPORT TO SECURITY HOLDERS

MGE Energy | 2022 Annual Report 2 0 2 2 A NN U A L R E P OR T SCIENCE I N FO R M E D B Y P O W ER ED B Y D R I V E N B Y PEOPLE TECHNOLOGY Y O U R C O M M U N I T Y E N E R G Y C O M P A N Y MGE is committed to environmental stewardship.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

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 March 6, 2023 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE En

EX-99

Regulation FD Disclosure, Financial Statements and Exhibits, Other Events

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 February 17, 2023 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MG

Income Continuation Agreement - Hobbie

EXHIBIT 10.34 INCOME CONTINUATION AGREEMENT This Income Continuation Agreement (Agreement) is entered into as of the day of , 2016 by and between Madison Gas and Electric Company, a Wisconsin corporation (MGE), and Lynn K. Hobbie (Employee), and shall be effective as of January 1, 2016. This Agreement supersedes any and all previous Income Continuation Agreements entered into by and between the Em

Second Amended and Restated Credit Agreement dated as of November 8, 2022, among Madison Gas and Electric Company, the Lenders party thereto and U.S. Bank National Association, as Administrative Agent.

EXHIBIT 10.4 Execution Version DEAL CUSIP NUMBER: 557498AE2 FACILITY CUSIP NUMBER: 557498AF9 SECOND AMENDED AND RESTATED CREDIT AGREEMENT DATED AS OF NOVEMBER 8, 2022 AMONG MADISON GAS AND ELECTRIC COMPANY, AS BORROWER, THE LENDERS, U.S. BANK NATIONAL ASSOCIATION, AS ADMINISTRATIVE AGENT, AND ASSOCIATED BANK, N.A., AS SYNDICATION AGENT U.S. BANK NATIONAL ASSOCIATION LEAD ARRANGER AND SOLE BOOK RUN

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

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 February 22, 2023 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MG

Second Amended and Restated Credit Agreement dated as of November 8, 2022, among Madison Gas and Electric Company, the Lenders party thereto and JPMorgan Chase Bank, N.A., as Administrative Agent.

EXHIBIT 10.2 SECOND AMENDED AND RESTATED CREDIT AGREEMENT DATED AS OF NOVEMBER 8, 2022 AMONG MADISON GAS AND ELECTRIC COMPANY, AS BORROWER, THE LENDERS, JPMORGAN CHASE BANK, N.A., AS ADMINISTRATIVE AGENT, AND BANK OF AMERICA, N.A. AND U.S. BANK NATIONAL ASSOCIATION, AS SYNDICATION AGENTS, JPMORGAN CHASE BANK, N.A., AS LEAD ARRANGER AND SOLE BOOK RUNNER Table of Contents Page ARTICLE I DEFINITIONS;

United States SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended: December 31, 2022 ☐ Transition report pursuant to Sect

United States SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended: December 31, 2022 ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. Name of Registrant, State of Incorporatio

Amendment to Madison Gas and Electric Company Deferred Compensation Agreement

EXHIBIT 10.31 AMENDMENT TO MADISON GAS AND ELECTRIC COMPANY DEFERRED COMPENSATION AGREEMENT Pursuant to Section 10 of the Deferred Compensation Agreement effective December 16, 2022, between (“Employee”) and Madison Gas and Electric Company (the “Agreement”), the Agreement is hereby amended as follows, effective January 1, 2023. 1. Section 4.d shall be revised to read as follows: For each calendar

2023 Deferred Compensation Supplemental Executive Retirement Plan

EXHIBIT 10.32 MADISON GAS AND ELECTRIC COMPANY 2023 DEFERRED COMPENSATION SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN Effective as of January 1, 2023 1 TABLE OF CONTENTS Page Article 1 PURPOSE; EFFECTIVE DATE 6 1.1 Purpose 6 1.2 Effective Date 6 1.3 Plan Type 6 Article 2 DEFINITIONS 7 2.1 Account(s) 7 2.2 Administrator 7 2.3 Beneficiary 7 2.4 Board 7 2.5 Change in Control 7 2.6 Code 9 2.7 Company 9 2.8

1 MGE Energy, Inc. (In thousands, except per share amounts)

EXHIBIT 99.1 News MGE Energy Reports Fourth-Quarter and Full Year 2022 Earnings Madison, Wis., Feb. 22, 2023—MGE Energy, Inc. (Nasdaq: MGEE), today reported financial results for the fourth quarter of 2022 and for the full year of 2022. MGE Energy's earnings for the full year of 2022 were $111.0 million, or $3.07 per share, compared to $105.8 million, or $2.92 per share, for the same period in the

Subsidiaries of MGE Energy, Inc.

EXHIBIT 21 Subsidiaries of MGE Energy, Inc. As of December 31, 2022, the company held the following subsidiaries (all of which are formed or organized as Wisconsin entities): • Madison Gas and Electric Company – a regulated utility that generates and distributes electricity to approximately 161,000 customers in Dane County, Wisconsin, and purchases and distributes natural gas to approximately 173,

Income Continuation Agreement - Johnson

EXHIBIT 10.35 INCOME CONTINUATION AGREEMENT This Income Continuation Agreement (Agreement) is entered into as of the day of , 2016 by and between Madison Gas and Electric Company, a Wisconsin corporation (MGE), and Tamara J. Johnson (Employee), and shall be effective as of January 1, 2016. WHEREAS, MGE values the efforts, abilities, and accomplishments of the Employee, and recognizes that the Empl

Second Amended and Restated Credit Agreement dated as of November 8, 2022, among MGE Energy, Inc., the Lenders party thereto and JPMorgan Chase Bank, N.A., as Administrative Agent.

EXHIBIT 10.1 SECOND AMENDED AND RESTATED CREDIT AGREEMENT DATED AS OF NOVEMBER 8, 2022 AMONG MGE ENERGY, INC., AS BORROWER, THE LENDERS, JPMORGAN CHASE BANK, N.A., AS ADMINISTRATIVE AGENT, AND BANK OF AMERICA, N.A. AND U.S. BANK NATIONAL ASSOCIATION, AS SYNDICATION AGENTS, JPMORGAN CHASE BANK, N.A., AS LEAD ARRANGER AND SOLE BOOK RUNNER Table of Contents Page ARTICLE I DEFINITIONS; ETC 1 1.1. Defi

MGEE / MGE Energy, Inc. / PRICE T ROWE ASSOCIATES INC /MD/ Passive Investment

SC 13G/A 1 mgee13gadec22.txt UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1) MGE ENERGY INC (Name of Issuer) COMMON STOCK (Title of Class of Securities) 55277P104 (CUSIP NUMBER) December 31, 2022 (Date of Event which Requires Filing of Statement) Check the appropriate box to designate the Rule pursuant

MGEE / MGE Energy, Inc. / T. Rowe Price Investment Management, Inc. Passive Investment

SC 13G 1 mgee13gdec22.txt UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. ) MGE ENERGY INC (Name of Issuer) COMMON STOCK (Title of Class of Securities) 55277P104 (CUSIP NUMBER) December 31, 2022 (Date of Event which Requires Filing of Statement) Check the appropriate box to designate the Rule pursuant to

MGEE / MGE Energy, Inc. / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SC 13G/A 1 tv0083-mgeenergyinc.htm SCHEDULE 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 13)* Name of issuer: MGE Energy Inc. Title of Class of Securities: Common Stock CUSIP Number: 55277P104 Date of Event Which Requires Filing of this Statement: December 30, 2022 Check the appropriate box to designate the r

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

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 January 30, 2023 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE

FIRST AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT

FIRST AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT THIS FIRST AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT (this “Amendment”), dated as of January 30, 2023, is entered into by and among MADISON GAS AND ELECTRIC COMPANY, a Wisconsin corporation (the “Borrower”), the Lenders party hereto, and JPMORGAN CHASE BANK, N.

MGEE / MGE Energy, Inc. / BlackRock Inc. Passive Investment

SC 13G/A 1 us55277p1049013123.txt us55277p1049013123.txt SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No: 13) MGE ENERGY INC - (Name of Issuer) Common Stock - (Title of Class of Securities) 55277P104 - (CUSIP Number) December 31, 2022 - (Date of Event Which Requires Filing of this Statement) Check the appropriate box to

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

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 December 16, 2022 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MG

EX-99.1

Regulation FD Disclosure, Financial Statements and Exhibits

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 November 10, 2022 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MG

Entry into a Material Definitive Agreement, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

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 November 8, 2022 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE

Financial Statements and Exhibits, Results of Operations and Financial Condition

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 November 3, 2022 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE

Madison Gas and Electric Company $25,000,000 5.43% Senior Notes, Series A, due December 1, 2032 $15,000,000 5.43% Senior Notes, Series B, due February 15, 2033 $35,000,000 5.53% Senior Notes, Series C, due February 15, 2035 Note Purchase Agreement Da

EXHIBIT 4.1 Madison Gas and Electric Company $25,000,000 5.43% Senior Notes, Series A, due December 1, 2032 $15,000,000 5.43% Senior Notes, Series B, due February 15, 2033 $35,000,000 5.53% Senior Notes, Series C, due February 15, 2035 Note Purchase Agreement Dated November 1, 2022 Table of Contents Section Heading Page Section 1. Authorization of Notes 1 Section 2. Sale and Purchase of Notes 1 Se

United States SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended: September 30, 2022 ☐ Transition Report Pursuan

United States SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended: September 30, 2022 ? Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. Name of Registrant, State of Inc

1 MGE Energy, Inc. (In thousands, except per share amounts)

EXHIBIT 99.1 News MGE Energy Reports Third-Quarter 2022 Earnings Madison, Wis., Nov. 03, 2022?MGE Energy, Inc. (Nasdaq: MGEE), today reported financial results for the third quarter of 2022. MGE Energy's GAAP (Generally Accepted Accounting Principles) earnings for the third quarter of 2022 were $33.7 million, or $0.93 cents per share, compared to $34.9 million, or $0.97 cents per share, for the sa

LETTER

United States securities and exchange commission logo September 23, 2022 Jared Bushek Chief Financial Officer MGE Energy, Inc.

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Jared J. Bushek Vice President Finance, Chief Information Officer and Treasurer 608-252-7238 September 13, 2022 Sent Via EDGAR Securities and Exchange Commission Division of Corporation Finance Office of Energy & Transportation 100 F Street, Northeast Washington D.C. 20549 Attention: Ms. Jenifer Gallagher Staff Accountant Office of Energy & Transportation Mr. Karl Hiller Branch Chief Office of Ene

LETTER

United States securities and exchange commission logo September 7, 2022 Jared Bushek Chief Financial Officer MGE Energy, Inc.

Financial Statements and Exhibits, Other Events

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 August 19, 2022 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE

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EXHIBIT 99.1 News MGE Energy Increases Dividend for 47th Consecutive Year Madison, Wis., Aug 19, 2022?The board of directors of MGE Energy, Inc. (Nasdaq: MGEE), today increased the regular quarterly dividend rate approximately 5% to $0.4075 per share on the outstanding shares of the company's common stock. The dividend is payable Sept. 15, 2022, to shareholders of record Sept. 1, 2022. This raises

1 MGE Energy, Inc. (In thousands, except per share amounts)

EXHIBIT 99.1 News MGE Energy Reports Second-Quarter 2022 Earnings Madison, Wis., Aug 04, 2022?MGE Energy, Inc. (Nasdaq: MGEE), today reported financial results for the second quarter of 2022. MGE Energy's GAAP (Generally Accepted Accounting Principles) earnings for the second quarter of 2022 were $21.8 million, or $0.60 cents per share, compared to $22.9 million, or $0.63 cents per share, for the

Financial Statements and Exhibits, Results of Operations and Financial Condition

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 August 4, 2022 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE E

United States SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended: June 30, 2022 ☐ Transition Report Pursuant to

United States SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended: June 30, 2022 ? Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. Name of Registrant, State of Incorpor

Submission of Matters to a Vote of Security Holders

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 17, 2022 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE Ene

Reminder to vote your shares posted on mgeenergy.com on Friday, May 6, 2022.

DEFA14A 1 f20220509defa-14aaddition1.htm Reminder to vote your shares posted on mgeenergy.com on Friday, May 6, 2022. VOTE YOUR SHARES We encourage all shareholders to exercise their right and responsibility to vote their shares. Whether shareholders own shares through a brokerage firm or are directly registered with MGE Energy, we make voting easy. Return your vote form through the mail or vote o

Financial Statements and Exhibits, Results of Operations and Financial Condition

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 5, 2022 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE Ener

1 MGE Energy, Inc. (In thousands, except per share amounts)

EXHIBIT 99.1 News MGE Energy Reports First-Quarter 2022 Earnings Madison, Wis., May 05, 2022?MGE Energy, Inc. (Nasdaq: MGEE), today reported financial results for the first quarter of 2022. MGE Energy's GAAP (Generally Accepted Accounting Principles) earnings for the first quarter of 2022 were $34.4 million, or $0.95 cents per share, compared to $34.9 million, or $0.97 cents per share, for the sam

United States SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended: March 31, 2022 ☐ Transition Report Pursuant to

United States SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended: March 31, 2022 ? Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. Name of Registrant, State of Incorpo

Reminder to vote information mailed to MGE Energy shareholders on Friday, April 15, 2022.

Reminder to vote information mailed to MGE Energy shareholders on Friday, April 15, 2022.

2021 Director Compensation

BOARD OF DIRECTORS INFORMATION How Our Board Operates Board meetings are typically held at the Company's corporate headquarters in Madison, Wisconsin; however, in the interest of public health and safety during the COVID-19 pandemic, board meetings were held virtually.

Technology in Action Technology to decarbonize our grid …to engage customers in energy …to electrify transportation

The following is a transcription of Chairman, President and CEO Jeffrey Keebler's video message prepared by MGE Energy, Inc.

1 MGE Energy, Inc. (In thousands, except per share amounts)

EXHIBIT 99.1 News MGE Energy Reports Fourth-Quarter and Full Year 2021 Earnings Madison, Wis., Feb. 23, 2022?MGE Energy, Inc. (Nasdaq: MGEE), today reported financial results for the fourth quarter of 2021 and for the full year of 2021. MGE Energy's GAAP (Generally Accepted Accounting Principles) earnings for the full year of 2021 were $105.8 million, or $2.92 per share, compared to $92.4 million,

Financial Statements and Exhibits, Results of Operations and Financial Condition

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 February 23, 2022 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MG

Subsidiaries of MGE Energy, Inc.

EXHIBIT 21 Subsidiaries of MGE Energy, Inc. As of December 31, 2021, the company held the following subsidiaries (all of which are formed or organized as Wisconsin entities): ? Madison Gas and Electric Company ? a regulated utility that generates and distributes electricity to approximately 159,000 customers in Dane County, Wisconsin, and purchases and distributes natural gas to approximately 169,

United States SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended: December 31, 2021 ☐ Transition report pursuant to Sect

United States SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ? Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended: December 31, 2021 ? Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. Name of Registrant, State of Incorporatio

MGEE / MGE Energy, Inc. / PRICE T ROWE ASSOCIATES INC /MD/ Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. ) MGE ENERGY INC (Name of Issuer) COMMON STOCK (Title of Class of Securities) 55277P104 (CUSIP NUMBER) December 31, 2021 (Date of Event which Requires Filing of Statement) Check the appropriate box to designate the Rule pursuant to which this Schedule is fil

MGEE / MGE Energy, Inc. / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 12)* Name of issuer: MGE Energy Inc. Title of Class of Securities: Common Stock CUSIP Number: 55277P104 Date of Event Which Requires Filing of this Statement: December 31, 2021 Check the appropriate box to designate the rule pursuant to which this Schedule is filed: ??Ru

MGEE / MGE Energy, Inc. / BlackRock Inc. Passive Investment

us55277p1049020222.txt SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No: 12) MGE ENERGY INC - (Name of Issuer) Common Stock - (Title of Class of Securities) 55277P104 - (CUSIP Number) December 31, 2021 - (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to wh

United States SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended: September 30, 2021 ☐ Transition Report Pursuan

United States SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended: September 30, 2021 ? Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. Name of Registrant, State of Inc

Financial Statements and Exhibits, Results of Operations and Financial Condition

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 November 4, 2021 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE

1 MGE Energy, Inc. (In thousands, except per share amounts)

EXHIBIT 99.1 News MGE Energy Reports Third-Quarter Earnings Madison, Wis., Nov. 4, 2021?MGE Energy, Inc. (Nasdaq: MGEE), today reported financial results for the third quarter of 2021. MGE Energy?s GAAP (Generally Accepted Accounting Principles) earnings for the third quarter of 2021 were $34.9 million, or $0.97 per share, compared to $31.8 million, or $0.88 per share, for the same period in the p

Financial Statements and Exhibits, Other Events

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 November 3, 2021 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE

1

MGE Announces Plans to End Remaining Use of Coal Plan to end the use of coal as a primary fuel at Elm Road will help MGE achieve its carbon reduction goals.

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

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 October 15, 2021 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE

1

EXHIBIT 99.1 News MGE Energy Increases Dividend for 46th Consecutive Year Madison, Wis., Aug 20, 2021?The board of directors of MGE Energy, Inc. (Nasdaq: MGEE) today increased the regular quarterly dividend rate approximately 5% to $0.3875 per share on the outstanding shares of the company's common stock. The dividend is payable Sept. 15, 2021, to shareholders of record Sept. 1, 2021. This raises

Financial Statements and Exhibits, Other Events

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 August 20, 2021 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE

MGE Energy, Inc.

EX-99 2 ex991.htm EXHIBIT 99.1 EXHIBIT 99.1 News MGE Energy Reports Second-Quarter Earnings Madison, Wis., Aug 05, 2021—MGE Energy, Inc. (Nasdaq: MGEE) today reported financial results for the second quarter of 2021. MGE Energy’s GAAP (Generally Accepted Accounting Principles) earnings for the second quarter of 2021 were $22.9 million, or $0.63 per share, compared to $18.8 million, or $0.53 per sh

United States SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended: June 30, 2021 ☐ Transition Report Pursuant to

United States SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended: June 30, 2021 ? Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. Name of Registrant, State of Incorpor

Financial Statements and Exhibits, Results of Operations and Financial Condition

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 August 5, 2021 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE E

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

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 July 16, 2021 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE En

Submission of Matters to a Vote of Security Holders

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 18, 2021 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE Ene

$60,000,000 2.48% Senior Notes, Series A, due August 15, 2031 $40,000,000 2.63% Senior Notes, Series B, due June 15, 2033 Note Purchase Agreement Dated May 10, 2021 TABLE OF CONTENTS

EXECUTION VERSION Exhibit 4.1 Madison Gas and Electric Company $60,000,000 2.48% Senior Notes, Series A, due August 15, 2031 $40,000,000 2.63% Senior Notes, Series B, due June 15, 2033 Note Purchase Agreement Dated May 10, 2021 TABLE OF CONTENTS SECTIONHEADINGPAGE Section 1.Authorization of Notes1 Section 2.Sale and Purchase of Notes1 Section 3.Closing2 Section 4.Conditions to Closings2 Section 4.

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

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 10, 2021 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE Ene

MGE Energy, Inc.

EXHIBIT 99.1 News MGE Energy Reports First-Quarter Earnings Madison, Wis., May 06, 2021?MGE Energy, Inc. (Nasdaq: MGEE) today reported financial results for the first quarter of 2021. MGE Energy?s GAAP (Generally Accepted Accounting Principles) earnings for the first quarter of 2021 were $ 34.9 million, or $ 0.97 per share, compared to $ 26.0 million, or $ 0.75 per share, for the same period in th

Financial Statements and Exhibits, Results of Operations and Financial Condition

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 6, 2021 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE Ener

Quarterly Report - FORM 10-Q

United States SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended: March 31, 2021 ? Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. Name of Registrant, State of Incorpo

- FORM DEFA 14A

DEFA14A 1 f20200426-defa-14aaddition.htm FORM DEFA 14A [Reminder to vote information mailed to MGE Energy shareholders on Monday, April 26, 2021.]

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

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 April 16, 2021 Date of report (date of earliest event reported) Commission File No. Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. IRS Employer Identification No. 000-49965 MGE E

Powering Forward Sustainably

The following is a transcription of Chairman, President and CEO Jeffrey Keebler's video message prepared by MGE Energy, Inc.

[Additional information mailed to MGE Energy shareholders on or about March 31, 2021.]

[Additional information mailed to MGE Energy shareholders on or about March 31, 2021.]

NOTICE OF ANNUAL MEETING OF SHAREHOLDERS OF MGE ENERGY, INC.

NOTICE OF ANNUAL MEETING OF SHAREHOLDERS OF MGE ENERGY, INC. March 31, 2021 Regardless of whether you plan to attend the meeting, please take a moment to vote your proxy. Based on restrictions and guidance from federal, state, and local public health agencies concerning COVID-19, MGE Energy is holding its Annual Meeting virtually, using the same format as last year's meeting. As always, we encoura

Form of Restricted Stock Award Agreement for Directors pursuant to the MGE Energy Inc., 2021 Long-Term Incentive Plan

Exhibit 10.46 MGE ENERGY, INC. RESTRICTED STOCK AWARD AGREEMENT ? DIRECTOR MGE Energy, Inc., a Wisconsin corporation (the ?Company?), has granted to the Participant named in the Notice of Grant of Restricted Stock Award (the ?Grant Notice?) to which this Restricted Stock Award Agreement (the ?Agreement?) is attached an Award consisting of Shares of Restricted Stock (each a ?Share?) subject to the