ALE / ALLETE, Inc. - Pemfailan SEC, Laporan Tahunan, Penyata Proksi

ALLETE News Release dated August 7, 2025, announcing 2025 second quarter earnings. (This exhibit has been furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, except as shall be expressly set forth by specific reference in such filing.)

Exhibit 99 For Release: August 7, 2025 Investor Contact: 218-723-3952 shareholder@allete.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended June 30, 2025 or ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File Number 1-3548 ALLETE, Inc. (

Rule 13a-14(a)/15d-14(a) Certification by the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(a) Rule 13a-14(a)/15d-14(a) Certification by the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Bethany M.

Forty-Sixth Supplemental Indenture, dated as of July 1, 2025, between ALLETE, Inc. and The Bank of New York Mellon, as corporate trustee, and Sherma Thomas, as co-trustee.

Exhibit 4 SUPPLEMENTAL INDENTURE ALLETE, Inc. (formerly Minnesota Power & Light Company and formerly Minnesota Power, Inc.) TO THE BANK OF NEW YORK MELLON (formerly The Bank of New York (formerly Irving Trust Company)) AND SHERMA THOMAS (successor to Richard H. West, J. A. Austin, E. J. McCabe, D. W. May, J. A. Vaughan, W. T. Cunningham, Douglas J. MacInnes, Ming Ryan, Philip L. Watson, Andres Ser

Mine Safety.

Exhibit 95 Mine Safety Disclosure Mine or Operating Name/MSHA Identification Number Section 104 S&S Citations (#) Section 104(b) Orders (#) Section 104(d) Citations and Orders (#) Section 110(b)(2) Violations (#) Section 107(a) Orders (#) Total Dollar Value of MSHA Assessments Proposed ($) Total Number of Mining Related Fatalities (#) Received Notice of Pattern of Violation Under Section 104(e) (y

Amendment to Articles of Incorporation, dated as of May 13, 2025

Exhibit 3 ARTICLES OF AMENDMENT OF ALLETE, INC. Amending paragraphs 5, 7, 8, 9, 10, 11, 12, 13, and 15 of Article III and paragraph 1 of Article VI of ALLETE, Inc.’s Articles of Incorporation as Amended and Restated as of May 8, 2001 as previously amended as of September 20, 2004, May 28, 2009 and May 19, 2010 1.Article III, Section 5, of the Articles of Incorporation of ALLETE, Inc., as Amended a

Rule 13a-14(a)/15d-14(a) Certification by the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(b) Rule 13a-14(a)/15d-14(a) Certification by the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Jeffrey J.

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 Date of Report (Date of Earliest Event Reported) - July 9, 2025 ALLETE, Inc. (Exact name of registrant as specified in its charter) Minnesota 1-3548 41-0418150 (State or other jurisdiction of (Commission File Number) (IRS Employer in

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K (Mark One) x Annual Report Pursuant to Section 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended December 31, 2024

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K (Mark One) x Annual Report Pursuant to Section 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended December 31, 2024 or ¨ Transition Report Pursuant to Section 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File Number 1-3548 ALLETE AND AFFILIATED COMPANIE

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 Date of Report (Date of Earliest Event Reported) - May 13, 2025 ALLETE, Inc. (Exact name of registrant as specified in its charter) Minnesota 1-3548 41-0418150 (State or other jurisdiction of (Commission File Number) (IRS Employer in

Note Purchase Agreement, dated March 25, 2025, between ALLETE and the purchasers named therein.

Exhibit 4 EXECUTION COPY ALLETE, INC. $120,000,000 5.38% Senior Notes Due March 25, 2030 $30,000,000 5.82% Senior Notes Due March 25, 2035 Note Purchase Agreement Dated March 25, 2025 {00547113.DOC; 9} Exhibit 4 Table of Contents Page SECTION 2. Sale and Purchase of Notes 1 SECTION 3. Closing 1 SECTION 4. Conditions to Closing 2 Section 4.1 Representations and Warranties 2 Section 4.2 Performance;

ALLETE News Release dated May 8, 2025, announcing 2025 first quarter earnings. (This exhibit has been furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, except as shall be expressly set forth by specific reference in such filing.)

Exhibit 99 For Release: May 8, 2025 Investor Contact: 218-723-3952 shareholder@allete.

Mine Safety.

Exhibit 95 Mine Safety Disclosure Mine or Operating Name/MSHA Identification Number Section 104 S&S Citations (#) Section 104(b) Orders (#) Section 104(d) Citations and Orders (#) Section 110(b)(2) Violations (#) Section 107(a) Orders (#) Total Dollar Value of MSHA Assessments Proposed ($) Total Number of Mining Related Fatalities (#) Received Notice of Pattern of Violation Under Section 104(e) (y

Rule 13a-14(a)/15d-14(a) Certification by the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(b) Rule 13a-14(a)/15d-14(a) Certification by the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Jeffrey J.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended March 31, 2025 or ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File Number 1-3548 ALLETE, Inc.

Rule 13a-14(a)/15d-14(a) Certification by the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(a) Rule 13a-14(a)/15d-14(a) Certification by the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Bethany M.

Form of Amendment No. 3 to Fourth Amended and Restated Distribution Agreement between ALLETE, Inc. and Lampert Capital Markets, Inc.

Exhibit 1(f) AMENDMENT NO. 3 TO FOURTH AMENDED AND RESTATED DISTRIBUTION AGREEMENT , 202 Lampert Capital Markets, Inc. 444 Madison Avenue, 4th Floor New York, NY 10022 Attention: Randy Lampert Ladies and Gentlemen: Reference is hereby made to that certain Fourth Amended and Restated Distribution Agreement, dated February 25, 2015, between the parties hereto and thereto, as amended by Amendment No.

Opinion and Consent, dated May 6, 2025, of Julie L. Padilla, Esq., Vice President, Chief Legal Counsel and Corporate Secretary of ALLETE, Inc.

Exhibit 5(a) JULIE L. PADILLA Vice President, Chief Legal Officer and Corporate Secretary 218-279-5000 E-mail [email protected] May 6, 2025 ALLETE, Inc. 30 West Superior Street Duluth, Minnesota 55802-2093 Ladies and Gentlemen: Reference is made to the Registration Statement on Form S‑3 (the “Registration Statement”) to be filed by ALLETE, Inc. (“Company”), on or about the date hereof, with the

Consent of Independent Registered Public Accounting Firm.

Exhibit 23(a) CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We hereby consent to the incorporation by reference in this Registration Statement on Form S-3 of ALLETE, Inc.

Statement of Eligibility on Form T‑2 of Sherma Thomas with respect to the Mortgage.

Exhibit 25(b) UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-2 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF AN INDIVIDUAL DESIGNATED TO ACT AS TRUSTEE CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b)(2) [ ] SHERMA THOMAS (Name of trustee) 240 Greenwich Street Floor 7E New York, NY 10286 (Business address:

Consent of Morgan, Lewis & Bockius LLP (included in opinion, attached hereto as Exhibit 5(b)).

Exhibit 5(b) May 6, 2025 ALLETE, Inc. 30 West Superior Street Duluth, Minnesota 55802-2093 Ladies and Gentlemen: Reference is made to the Registration Statement on Form S‑3 (the “Registration Statement”) to be filed by ALLETE, Inc. (“Company”), on or about the date hereof, with the Securities and Exchange Commission (“Commission”) under the Securities Act of 1933, as amended (“Securities Act”), fo

Filing Fee Table.

Exhibit 107 Calculation of Filing Fee Tables Form S-3 (Form Type) ALLETE, Inc. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forw

Form of Supplemental Indenture relating to the first mortgage bonds.

Exhibit 4(c)(3) ALLETE, Inc. (formerly Minnesota Power & Light Company and formerly Minnesota Power, Inc.) TO THE BANK OF NEW YORK MELLON (formerly The Bank of New York (formerly Irving Trust Company)) AND SHERMA THOMAS (successor to Richard H. West, J. A. Austin, E. J. McCabe, D. W. May, J. A. Vaughan, W. T. Cunningham, Douglas J. MacInnes, Ming Ryan, Philip L. Watson, Andres Serrano, Eva Waite a

As filed with the Securities and Exchange Commission on May 6, 2025

As filed with the Securities and Exchange Commission on May 6, 2025 Registration Statement No.

Statement of Eligibility on Form T‑1 of The Bank of New York Mellon with respect to the Mortgage.

Exhibit 25(a) 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 YORK MELLON (Exact name of trustee as specified in its charter) New York (Jurisdicti

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 Date of Report (Date of Earliest Event Reported) - April 16, 2025 ALLETE, Inc. (Exa

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 Date of Report (Date of Earliest Event Reported) - April 16, 2025 ALLETE, Inc. (Exact name of registrant as specified in its charter) Minnesota 1-3548 41-0418150 (State or other jurisdiction of (Commission File Number) (IRS Employer

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.) Filed by the Registrant x Filed by a Party other than the Registrant

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.) Filed by the Registrant x Filed by a Party other than the Registrant o Check the appropriate box: o Preliminary Proxy Statement o Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) o Defini

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.) Filed by the Registrant x Filed by a Party other than the Registrant

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.) Filed by the Registrant x Filed by a Party other than the Registrant o Check the appropriate box: o Preliminary Proxy Statement o Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) x Defini

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.) Filed by the Registrant x Filed by a Party other than the Registrant

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.) Filed by the Registrant x Filed by a Party other than the Registrant o Check the appropriate box: x Preliminary Proxy Statement o Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) o Defini

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/A CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of Earliest Event Reported) - March 11, 2025 ALLETE, Inc. (Exact name of registrant as specified in its charter) Minnesota 1-3548 41-0418150 (State or other jurisdiction of (Commission File Number) (IRS Employe

ALLETE names Jeff Scissons chief financial officer

Exhibit 99 For Release: 3/11/2025 Media Contact: Amy Rutledge Director, Corporate Communications 218-723-7400 arutledge@allete.

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 Date of Report (Date of Earliest Event Reported) - March 11, 2025 ALLETE, Inc. (Exact name of registrant as specified in its charter) Minnesota 1-3548 41-0418150 (State or other jurisdiction of (Commission File Number) (IRS Employer

Opinion and Consent, dated February 14, 2025, of Julie L. Padilla, Esq., Vice President, Chief Legal Officer and Corporate Secretary of ALLETE.

Exhibit 5(a) JULIE L. PADILLA Vice President, Chief Legal Officer and Corporate Secretary 218-279-5000 E-mail [email protected] February 14, 2025 ALLETE, Inc. 30 West Superior Street Duluth, Minnesota 55802-2093 Ladies and Gentlemen: Reference is made to the Registration Statement on Form S-3 (the “Registration Statement”) to be filed by ALLETE, Inc. (“Company”), on or about the date hereof, wit

Consent of Morgan, Lewis & Bockius LLP (included in opinion, attached hereto as Exhibit 5(b)).

Exhibit 5(b) February 14, 2025 ALLETE, Inc. 30 West Superior Street Duluth, Minnesota 55802-2093 Ladies and Gentlemen: Reference is made to the Registration Statement on Form S-3 (the “Registration Statement”) to be filed by ALLETE, Inc. (“Company”), on or about the date hereof, with the Securities and Exchange Commission (“Commission”) under the Securities Act of 1933, as amended (“Securities Act

Filing Fee Table.

Exhibit 107 Calculation of Filing Fee Tables Form S-3 (Form Type) ALLETE, Inc. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities and Carry Forward Securities Security type Security class title Fee calculation or carry forward rule Amount registered Proposed maximum offering price per unit Maximum aggregate offering price Fee rate Amount of registration fee

As filed with the Securities and Exchange Commission on February 14, 2025

As filed with the Securities and Exchange Commission on February 14, 2025 Registration Statement No.

Subsidiaries of the Registrant.

Exhibit 21 SUBSIDIARIES OF THE REGISTRANT As of December 31, 2024 Name of Organization (a) State or Country ALLETE, Inc.

Policy Relating to Recovery of Erroneously Awarded Compensation.

Exhibit 97 Approved by the ALLETE Board Of Directors on October 27, 2023 ALLETE, INC.

ALLETE News Release dated February 13, 2025, announcing earnings for the year ended December 31, 2024. (This exhibit has been furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, except as shall be expressly set forth by specific reference in such filing.)

Exhibit 99 For Release: February 13, 2025 Investor Contact: 218-723-3952 shareholder@allete.

Rule 13a-14(a)/15d-14(a) Certification by the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(b) Rule 13a-14(a)/15d-14(a) Certification by the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Steven W.

Insider Trading Policies and Procedures.

Exhibit 19 Approved by the ALLETE Board of Directors on January 29, 2025 ALLETE, INC.

Form of ALLETE Executive Long-Term Incentive Compensation Plan Performance Share Grant Effective 2025.

Exhibit 10(h)16 ALLETE EXECUTIVE LONG-TERM INCENTIVE COMPENSATION PLAN PERFORMANCE SHARE GRANT «Employee» In accordance with the terms of ALLETE’s Executive Long-Term Incentive Compensation Plan, as amended (the "Plan"), and as determined by and through the Executive Compensation Committee of ALLETE’s Board of Directors, ALLETE hereby grants to you (the "Participant") Performance Shares, as set fo

Form of ALLETE Executive Long-Term Incentive Compensation Plan Restricted Stock Unit Grant Effective 2025.

Exhibit 10(h)15 ALLETE EXECUTIVE LONG-TERM INCENTIVE COMPENSATION PLAN RESTRICTED STOCK UNIT GRANT «Employee» In accordance with the terms of ALLETE’s Executive Long-Term Incentive Compensation Plan, as amended (the "Plan"), and as determined by and through the Executive Compensation Committee of ALLETE’s Board of Directors, ALLETE hereby grants to you (the "Participant") Restricted Stock Units (“

ALLETE Executive Annual Incentive Plan Form of Award ALLETE Clean Energy Effective 2025.

Exhibit 10(e)10 ALLETE Executive Annual Incentive Plan Form of Award Effective 2025 [Eligible ALLETE Clean Energy Employees] Target Award Opportunity Base Salary $ Times Award Opportunity (percent of base salary) % Equals Target Award $ Performance Levels and Award Amounts Goal Performance Level Payout as Percent of Target Award Award Amount Superior 200% $ Target 100% $ Threshold 50% $ Below Threshold 0% $ Goals Goal Weighting Financial Goals ALLETE Net Income 15% ALLETE Clean Energy Net Income 45% Strategic and Operational & Values Goals 40% 100% Compensation Subject to Compensation Recovery Policy Annual Incentive Plan Compensation is subject to recoupment as defined in the Compensation Recovery policy.

ALLETE Executive Annual Incentive Plan Form of Award Effective 2025.

Exhibit 10(e)9 ALLETE Executive Annual Incentive Plan Form of Award Effective 2025 [Eligible Executive Employees] Target Award Opportunity Base Salary $ Times Award Opportunity (percent of base salary) % Equals Target Award $ Performance Levels and Award Amounts Goal Performance Level Payout as Percent of Target Award Award Amount Superior 200% $ Target 100% $ Threshold 44% $ Below Threshold 0% $ Goals Goal Weighting Financial Goals Net Income 50% Cash from Operating Activities 20% Strategic and Operational & Values Goals 30% 100% Compensation Subject to Compensation Recovery Policy Annual Incentive Plan Compensation is subject to recoupment as defined in the Compensation Recovery policy.

Rule 13a-14(a)/15d-14(a) Certification by the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(a) Rule 13a-14(a)/15d-14(a) Certification by the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Bethany M.

Fourth Amendment to Credit Agreement dated as of June 4, 2024, among ALLETE, as Borrower, the lenders party thereto, and JPMorgan Chase Bank, N.A., as Administrative Agent.

Exhibit 10(b)5 Execution Version FOURTH AMENDMENT TO CREDIT AGREEMENT THIS FOURTH AMENDMENT TO CREDIT AGREEMENT dated as of June 4, 2024 (this “Amendment”) is among ALLETE, INC.

United States Securities and Exchange Commission Washington, D.C. 20549 Form 10-K (Mark One) ☒ Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

United States Securities and Exchange Commission Washington, D.C. 20549 Form 10-K (Mark One) ☒ Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the 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 Number 1-3548 ALLETE, Inc. (Exact name of

Mine Safety.

Exhibit 95 Mine Safety Disclosure Mine or Operating Name/MSHA Identification Number Section 104 S&S Citations (#) Section 104(b) Orders (#) Section 104(d) Citations and Orders (#) Section 110(b)(2) Violations (#) Section 107(a) Orders (#) Total Dollar Value of MSHA Assessments Proposed ($) Total Number of Mining- Related Fatalities (#) Received Notice of Pattern of Violation Under Section 104(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 Date of Report (Date of Earliest Event Reported) - January 24, 2025 ALLETE, Inc. (Exact name of registrant as specified in its charter) Minnesota 1-3548 41-0418150 (State or other jurisdiction of (Commission File Number) (IRS Employe

ALLETE receives FERC approval for proposed transaction with Canada Pension Plan Investment Board and Global Infrastructure Partners Expects transaction to close in mid-2025

Exhibit 99.1 For Release: 12/19/24 ALLETE receives FERC approval for proposed transaction with Canada Pension Plan Investment Board and Global Infrastructure Partners Expects transaction to close in mid-2025 DULUTH, Minn.— ALLETE, Inc. (NYSE: ALE) announced that the Federal Energy Regulatory Commission (FERC) approved the company’s proposed transaction with Canada Pension Plan Investment Board (CP

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 Date of Report (Date of Earliest Event Reported) - December 19, 2024 ALLETE, Inc. (Exact name of registrant as specified in its charter) Minnesota 1-3548 41-0418150 (State or other jurisdiction of (Commission File Number) (IRS Employ

Extraordinary Compensation Award and Opportunity Effective September 25, 2023.

Extraordinary Compensation Award and Opportunity Jeff Scissons The following Extraordinary Compensation award and opportunity is made for Jeff Scissons in connection with the Polaris Project (“Project”): Milestone Based Bonus Opportunity This describes the bonus opportunities you will be eligible to earn based on your performance through transaction closing (anticipated to be late 2024/early 2025).

Mine Safety.

Exhibit 95 Mine Safety Disclosure Mine or Operating Name/MSHA Identification Number Section 104 S&S Citations (#) Section 104(b) Orders (#) Section 104(d) Citations and Orders (#) Section 110(b)(2) Violations (#) Section 107(a) Orders (#) Total Dollar Value of MSHA Assessments Proposed ($) Total Number of Mining Related Fatalities (#) Received Notice of Pattern of Violation Under Section 104(e) (y

ALLETE News Release dated October 30, 2024, announcing 2024 third quarter earnings. (This exhibit has been furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, except as shall be expressly set forth by specific reference in such filing.)

Exhibit 99 For Release: October 30, 2024 Investor Contact: 218-723-3952 shareholder@allete.

Rule 13a-14(a)/15d-14(a) Certification by the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(a) Rule 13a-14(a)/15d-14(a) Certification by the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Bethany M.

ALLETE Executive Long-Term Incentive Compensation Plan Performance Share Grant Effective April 13, 2022.

ALLETE EXECUTIVE LONG-TERM INCENTIVE COMPENSATION PLAN PERFORMANCE SHARE GRANT Jeff Scissons In accordance with the terms of ALLETE’s Executive Long-Term Incentive Compensation Plan, as amended (the "Plan"), and as determined by and through the Executive Compensation Committee of ALLETE’s Board of Directors, ALLETE hereby grants to you (the "Participant") Performance Shares, as set forth below, su

Rule 13a-14(a)/15d-14(a) Certification by the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(b) Rule 13a-14(a)/15d-14(a) Certification by the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Steven W.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended September 30, 2024 or ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File Number 1-3548 ALLETE, I

XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT

Corporate and Other Segment [Member] Office of Natural Resources [Member] Office of Surface Mining [Member] Center Mine [Member] UNITED STATES Coal (Lignite) [Member]

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM SD SPECIALIZED DISCLOSURE REPORT ALLETE, Inc. (Exact name of the registrant as specified in its charter) Minnesota 1-3548 41-0418150 (State or other jurisdiction of (Commiss

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM SD SPECIALIZED DISCLOSURE REPORT ALLETE, Inc. (Exact name of the registrant as specified in its charter) Minnesota 1-3548 41-0418150 (State or other jurisdiction of (Commission File Number) (IRS Employer incorporation or organization) Identification No.) 30 West Superior Street Duluth, Minnesota 55802-2093 (Address of pri

XBRL INSTANCE DOCUMENT

iso4217:USD 0000066756 2023-01-01 2023-12-31 0000066756 4 2023-01-01 2023-12-31 0000066756 1 2023-01-01 2023-12-31 0000066756 5 2023-01-01 2023-12-31 0000066756 2 2023-01-01 2023-12-31 0000066756 3 2023-01-01 2023-12-31 0000066756 6 2023-01-01 2023-12-31 0000066756 ale:OfficeOfNaturalResourcesMember ale:CorporateAndOtherSegmentMember 2023-01-01 2023-12-31 0000066756 ale:OfficeOfSurfaceMiningMember

Disclosure of payments by resource extraction issuer for the fiscal year ended December 31, 2023

Exhibit 2.01 Reporting Entity Name: ALLETE INC Currency Used to Make Payments: USD Fiscal Year: 1/1/2023 - 12/31/2023 Business Segment: Corporate and Other Country Payee Name Project Name Resource Subject to Commercial Development Method of Extraction Major Subnational Political Jurisdiction of the Project Taxes Royalties Fees Total Amount Paid United States of America Office of Natural Resources

ALLETE shareholders approve proposed transaction with Canada Pension Plan Investment Board and Global Infrastructure Partners ALLETE continues to expect transaction to close in mid-2025

Exhibit 99.1 For Release: August 21, 2024 ALLETE shareholders approve proposed transaction with Canada Pension Plan Investment Board and Global Infrastructure Partners ALLETE continues to expect transaction to close in mid-2025 DULUTH, Minn.— ALLETE, Inc. (NYSE: ALE) announced that its shareholders voted today to approve the company’s proposed transaction with Canada Pension Plan Investment Board

Regulation FD Disclosure, 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 Date of Report (Date of Earliest Event Reported) - August 21, 2024 ALLETE, Inc. (Exact name of registrant as specified in its charter) Minnesota 1-3548 41-0418150 (State or other jurisdiction of (Commission File Number) (IRS Employer

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 the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the app

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 the 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 State

Rule 13a-14(a)/15d-14(a) Certification by the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(a) Rule 13a-14(a)/15d-14(a) Certification by the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Bethany M.

Rule 13a-14(a)/15d-14(a) Certification by the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(b) Rule 13a-14(a)/15d-14(a) Certification by the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Steven W.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended June 30, 2024 or ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File Number 1-3548 ALLETE, Inc. (

Note Purchase Agreement, dated June 27, 2024, between ALLETE and the purchasers named therein.

Exhibit 4 ALLETE, INC. $100,000,000 5.94% Senior Notes Due September 5, 2029 $50,000,000 6.18% Senior Notes Due September 5, 2034 Note Purchase Agreement Dated June 27, 2024 Table of Contents Page SECTION 2. Sale and Purchase of Notes 1 SECTION 3. Closing 1 SECTION 4. Conditions to Closing 2 Section 4.1 Representations and Warranties 2 Section 4.2 Performance; No Default 2 Section 4.3 Compliance C

Mine Safety.

Exhibit 95 Mine Safety Disclosure Mine or Operating Name/MSHA Identification Number Section 104 S&S Citations (#) Section 104(b) Orders (#) Section 104(d) Citations and Orders (#) Section 110(b)(2) Violations (#) Section 107(a) Orders (#) Total Dollar Value of MSHA Assessments Proposed ($) Total Number of Mining Related Fatalities (#) Received Notice of Pattern of Violation Under Section 104(e) (y

Notice of Prepayment to the Holders of the 2.65% Senior Notes due September 10, 2025 of ALLETE, Inc.

Exhibit 99.2 NOTICE OF PREPAYMENT TO THE HOLDERS OF THE 2.65% Senior Notes due September 10, 2025 of ALLETE, Inc. Prepayment Date: September 5, 2024 NOTICE IS HEREBY GIVEN, pursuant to Section 8.2 of the Note Purchase Agreement dated as of September 10, 2020 (the “Note Purchase Agreement”), between ALLETE, Inc., a Minnesota corporation (the “Company”), and the Purchasers listed in the Purchasers S

ALLETE News Release dated August 1, 2024, announcing 2024 second quarter earnings. (This exhibit has been furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, except as shall be expressly set forth by specific reference in such filing.)

Exhibit 99.1 For Release: August 1, 2024 Investor Contact: Vince Meyer 218-723-3952 NEWS [email protected] ALLETE, Inc. reports second quarter 2024 earnings DULUTH, Minn. - ALLETE, Inc. (NYSE: ALE) today reported second quarter 2024 earnings of 57 cents per share on net income of $33.0 million. Last year’s second quarter results were 90 cents per share on net income of $51.5 million. Net income fo

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 the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the app

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 the 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 State

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

TABLE OF CONTENTS 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 the 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)) ☒

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K (Mark One) x Annual Report Pursuant to Section 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended December 31, 2023

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K (Mark One) x Annual Report Pursuant to Section 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended December 31, 2023 or ¨ Transition Report Pursuant to Section 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File Number 1-3548 ALLETE AND AFFILIATED COMPANIE

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 the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the app

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 the 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 State

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

TABLE OF CONTENTS 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 the 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))  ☐

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

TABLE OF CONTENTS 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 the 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))  ☐

CALCULATION OF FILING FEE TABLES Schedule 14A (Form Type) ALLETE, Inc. (Exact Name of Registrant as Specified in its Charter) Table 1: Transaction Valuation

Exhibit 107 CALCULATION OF FILING FEE TABLES Schedule 14A (Form Type) ALLETE, Inc.

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 the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the app

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 the 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 State

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 Date of Report (Date of Earliest Event Reported) - May 14, 2024 ALLETE, Inc. (Exact name of registrant as specified in its charter) Minnesota 1-3548 41-0418150 (State or other jurisdiction of (Commission File Number) (IRS Employer in

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 the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the app

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 the 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 State

1-3548 (March 31, 2024, Form 10-Q)

Exhibit 4 SUPPLEMENTAL INDENTURE ALLETE, Inc. (formerly Minnesota Power & Light Company and formerly Minnesota Power, Inc.) TO THE BANK OF NEW YORK MELLON (formerly The Bank of New York (formerly Irving Trust Company)) AND SHERMA THOMAS (successor to Richard H. West, J. A. Austin, E. J. McCabe, D. W. May, J. A. Vaughan, W. T. Cunningham, Douglas J. MacInnes, Ming Ryan, Philip L. Watson, Andres Ser

Rule 13a-14(a)/15d-14(a) Certification by the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(b) Rule 13a-14(a)/15d-14(a) Certification by the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Steven W.

ALLETE News Release dated May 9, 2024, announcing 2024 first quarter earnings. (This exhibit has been furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, except as shall be expressly set forth by specific reference in such filing.)

Exhibit 99 For Release: May 9, 2024 Investor Contact: Vince Meyer 218-723-3952 NEWS vmeyer@allete.

Rule 13a-14(a)/15d-14(a) Certification by the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(a) Rule 13a-14(a)/15d-14(a) Certification by the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Bethany M.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended March 31, 2024 or ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File Number 1-3548 ALLETE, Inc.

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 the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the app

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 the 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 State

Mine Safety.

Exhibit 95 Mine Safety Disclosure Mine or Operating Name/MSHA Identification Number Section 104 S&S Citations (#) Section 104(b) Orders (#) Section 104(d) Citations and Orders (#) Section 110(b)(2) Violations (#) Section 107(a) Orders (#) Total Dollar Value of MSHA Assessments Proposed ($) Total Number of Mining Related Fatalities (#) Received Notice of Pattern of Violation Under Section 104(e) (y

ALLETE, Inc. • 30 West Superior Street, Duluth, Minnesota 55802

Exhibit 99.1 ALLETE Enters Agreement to be Acquired by a Partnership Led by Canada Pension Plan Investment Board and Global Infrastructure Partners to Advance ‘Sustainability-in-Action’ Strategy •Positions ALLETE to Execute Clean-Energy Future for Customers, Communities and Employees as a Private Company •ALLETE to Remain Locally Managed and Operated with Headquarters in Duluth, Minnesota •Agreeme

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 the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the app

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 the 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 State

EXPLANATORY NOTE

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 the 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 State

Agreement and Plan of Merger by and among ALLETE, Inc., Alloy Parent LLC and Alloy Merger Sub LLC, dated as of May 5, 2024*

Exhibit 2.1 Execution Version AGREEMENT AND PLAN OF MERGER by and among ALLETE, INC., ALLOY PARENT LLC and ALLOY MERGER SUB LLC Dated as of May 5, 2024 Exhibit 2.1 TABLE OF CONTENTS ARTICLE I THE MERGER Section 1.01 The Merger 2 Section 1.02 The Effective Time 2 Section 1.03 The Closing 2 Section 1.04 Effects of the Merger 3 Section 1.05 Surviving Corporation Organizational Documents 3 Section 1.0

Regulation FD Disclosure, Entry into a Material Definitive Agreement, 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 Date of Report (Date of Earliest Event Reported) - May 5, 2024 ALLETE, Inc. (Exact name of registrant as specified in its charter) Minnesota 1-3548 41-0418150 (State or other jurisdiction of (Commission File Number) (IRS Employer inc

Agreement and Plan of Merger by and among ALLETE, Inc., Alloy Parent LLC and Alloy Merger Sub LLC, dated as of May 5, 2024 (filed as Exhibit 2.1 to the May 6, 2024, Form 8-K, File No. 1-3548).*

Exhibit 2.1 Execution Version AGREEMENT AND PLAN OF MERGER by and among ALLETE, INC., ALLOY PARENT LLC and ALLOY MERGER SUB LLC Dated as of May 5, 2024 Exhibit 2.1 TABLE OF CONTENTS ARTICLE I THE MERGER Section 1.01 The Merger 2 Section 1.02 The Effective Time 2 Section 1.03 The Closing 2 Section 1.04 Effects of the Merger 3 Section 1.05 Surviving Corporation Organizational Documents 3 Section 1.0

Joint Press Release, dated May 6, 2024

Exhibit 99.1 ALLETE Enters Agreement to be Acquired by a Partnership Led by Canada Pension Plan Investment Board and Global Infrastructure Partners to Advance ‘Sustainability-in-Action’ Strategy •Positions ALLETE to Execute Clean-Energy Future for Customers, Communities and Employees as a Private Company •ALLETE to Remain Locally Managed and Operated with Headquarters in Duluth, Minnesota •Agreeme

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.) Filed by the Registrant x Filed by a Party other than the Registrant

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.) Filed by the Registrant x Filed by a Party other than the Registrant o Check the appropriate box: o Preliminary Proxy Statement o Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) x Defini

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.) Filed by the Registrant x Filed by a Party other than the Registrant

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.) Filed by the Registrant x Filed by a Party other than the Registrant o Check the appropriate box: o Preliminary Proxy Statement o Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) o Defini

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 Date of Report (Date of Earliest Event Reported) - March 19, 2024 ALLETE, Inc. (Exact name of registrant as specified in its charter) Minnesota 1-3548 41-0418150 (State or other jurisdiction of (Commission File Number) (IRS Employer

Policy Relating to Recovery of Erroneously Awarded Compensation.

Exhibit 97 Approved by the ALLETE Board Of Directors on October 27, 2023 ALLETE, INC.

Mine Safety.

Exhibit 95 Mine Safety Disclosure Mine or Operating Name/MSHA Identification Number Section 104 S&S Citations (#) Section 104(b) Orders (#) Section 104(d) Citations and Orders (#) Section 110(b)(2) Violations (#) Section 107(a) Orders (#) Total Dollar Value of MSHA Assessments Proposed ($) Total Number of Mining- Related Fatalities (#) Received Notice of Pattern of Violation Under Section 104(e) (

Subsidiaries of the Registrant.

Exhibit 21 SUBSIDIARIES OF THE REGISTRANT As of December 31, 2023 Name of Organization (a) State or Country ALLETE, Inc.

ALLETE Executive Annual Incentive Plan Form of Award ALLETE Clean Energy Effective 2024.

Exhibit 10(e)9 ALLETE Executive Annual Incentive Plan Form of Award Effective 2024 [Eligible ALLETE Clean Energy Employees] Target Award Opportunity Base Salary $ Times Award Opportunity (percent of base salary) % Equals Target Award $ Performance Levels and Award Amounts Goal Performance Level Payout as Percent of Target Award Award Amount Superior 200% $ Target 100% $ Threshold 50% $ Below Threshold 0% $ Goals Goal Weighting Financial Goals ALLETE Net Income 15% ALLETE Clean Energy Net Income 45% Strategic and Operational & Values Goals 40% 100% Compensation Subject to Compensation Recovery Policy Annual Incentive Plan Compensation is subject to recoupment as defined in the Compensation Recovery policy.

Rule 13a-14(a)/15d-14(a) Certification by the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(b) Rule 13a-14(a)/15d-14(a) Certification by the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Steven W.

Regulation FD Disclosure

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K/A (Amendment No. 1) CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of Earliest Event Reported) - February 20, 2024 ALLETE, Inc. (Exact name of registrant as specified in its charter) Minnesota 1-3548 41-0418150 (State or other jurisdiction of (Commission File

ALLETE Executive Annual Incentive Plan Form of Award Effective 2024.

Exhibit 10(e)8 ALLETE Executive Annual Incentive Plan Form of Award Effective 2024 [Eligible Executive Employees] Target Award Opportunity Base Salary $ Times Award Opportunity (percent of base salary) % Equals Target Award $ Performance Levels and Award Amounts Goal Performance Level Payout as Percent of Target Award Award Amount Superior 200% $ Target 100% $ Threshold 44% $ Below Threshold 0% $ Goals Goal Weighting Financial Goals Net Income 50% Cash from Operating Activities 20% Strategic and Operational & Values Goals 30% 100% Compensation Subject to Compensation Recovery Policy Annual Incentive Plan Compensation is subject to recoupment as defined in the Compensation Recovery policy.

ALLETE and Affiliated Companies Supplemental Executive Retirement Plan II (SERP II), as amended and restated, effective October 27, 2023.

Exhibit 10(f)4 ALLETE AND AFFILIATED COMPANIES SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN II Amended and Restated Effective October 27, 2023 Exhibit 10(f)4 TABLE OF CONTENTS Page ARTICLE 1 Establishment and Purpose.

Form of ALLETE Executive Long-Term Incentive Compensation Plan Performance Share Grant Effective 2024.

Exhibit 10(h)16 ALLETE EXECUTIVE LONG-TERM INCENTIVE COMPENSATION PLAN PERFORMANCE SHARE GRANT Name In accordance with the terms of ALLETE’s Executive Long-Term Incentive Compensation Plan, as amended (the "Plan"), and as determined by and through the Executive Compensation Committee of ALLETE’s Board of Directors, ALLETE hereby grants to you (the "Participant") Performance Shares, as set forth be

ALLETE News Release dated February 20, 2024, announcing earnings for the year ended December 31, 2023. (This exhibit has been furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, except as shall be expressly set forth by specific reference in such filing.)

Exhibit 99 For Release: February 20, 2024 NEWS Investor Contact: Vince Meyer 218-723-3952 vmeyer@allete.

Form of ALLETE Executive Long-Term Incentive Compensation Plan Restricted Stock Unit Grant Effective 2024.

Exhibit 10(h)15 ALLETE EXECUTIVE LONG-TERM INCENTIVE COMPENSATION PLAN RESTRICTED STOCK UNIT GRANT Name In accordance with the terms of ALLETE’s Executive Long-Term Incentive Compensation Plan, as amended (the "Plan"), and as determined by and through the Executive Compensation Committee of ALLETE’s Board of Directors, ALLETE hereby grants to you (the "Participant") Restricted Stock Units (“RSU’s”

Regulation FD Disclosure

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 Date of Report (Date of Earliest Event Reported) - February 20, 2024 ALLETE, Inc. (Exact name of registrant as specified in its charter) Minnesota 1-3548 41-0418150 (State or other jurisdiction of (Commission File Number) (IRS Employ

ALLETE and Affiliated Companies Change in Control Severance Plan, as amended and restated, effective October 27, 2023

Exhibit 10(n)2 AMENDED AND RESTATED ALLETE AND AFFILIATED COMPANIES CHANGE IN CONTROL SEVERANCE PLAN ALLETE’s Board of Directors has determined that it is in the best interest of ALLETE and its shareholders to foster the continued dedication and objectivity of certain key members of the Company's management notwithstanding the possibility or occurrence of an acquisition by another company or other change in control of the Company.

ALLETE Executive Annual Incentive Plan, as amended and restated, effective December 21, 2023.

Exhibit 10(e)7 AMENDED AND RESTATED ALLETE EXECUTIVE ANNUAL INCENTIVE PLAN With Amendments through December 21, 2023 Exhibit 10(e)7 AMENDED AND RESTATED ALLETE EXECUTIVE ANNUAL INCENTIVE PLAN Article 1.

United States Securities and Exchange Commission Washington, D.C. 20549 Form 10-K (Mark One) ☒ Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

United States Securities and Exchange Commission Washington, D.C. 20549 Form 10-K (Mark One) ☒ Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the 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 Number 1-3548 ALLETE, Inc. (Exact name of

Rule 13a-14(a)/15d-14(a) Certification by the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(a) Rule 13a-14(a)/15d-14(a) Certification by the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Bethany M.

ALE / ALLETE, Inc. / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SC 13G/A 1 tv0006-alleteinc.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: ALLETE Inc Title of Class of Securities: Common Stock CUSIP Number: 018522300 Date of Event Which Requires Filing of this Statement: December 29, 2023 Check the appropriate box to designate the rule purs

Mine Safety.

Exhibit 95 Mine Safety Disclosure Mine or Operating Name/MSHA Identification Number Section 104 S&S Citations (#) Section 104(b) Orders (#) Section 104(d) Citations and Orders (#) Section 110(b)(2) Violations (#) Section 107(a) Orders (#) Total Dollar Value of MSHA Assessments Proposed ($) Total Number of Mining Related Fatalities (#) Received Notice of Pattern of Violation Under Section 104(e) (y

ALLETE News Release dated November 2, 2023, announcing 2023 third quarter earnings. (This exhibit has been furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, except as shall be expressly set forth by specific reference in such filing.)

Exhibit 99 For Release: November 2, 2023 Investor Contact: Vince Meyer 218-723-3952 NEWS vmeyer@allete.

Rule 13a-14(a)/15d-14(a) Certification by the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(a) Rule 13a-14(a)/15d-14(a) Certification by the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Bethany M.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended September 30, 2023 or ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File Number 1-3548 ALLETE, I

Third Amendment to Credit Agreement dated as of October 17, 2023, among ALLETE, as Borrower, the lenders party thereto, and JPMorgan Chase Bank, N.A., as Administrative Agent. (filed as Exhibit 10 to the Sept. 30, 2023, Form 10-Q, File No. 1-3548).

Exhibit 10 THIRD AMENDMENT TO CREDIT AGREEMENT THIS THIRD AMENDMENT TO CREDIT AGREEMENT dated as of October 17, 2023 (this “Amendment”) is among ALLETE, INC.

Rule 13a-14(a)/15d-14(a) Certification by the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(b) Rule 13a-14(a)/15d-14(a) Certification by the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Steven W.

Rule 13a-14(a)/15d-14(a) Certification by the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(b) Rule 13a-14(a)/15d-14(a) Certification by the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Steven W.

ALLETE News Release dated August 8, 2023, announcing 2023 second quarter earnings. (This exhibit has been furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, except as shall be expressly set forth by specific reference in such filing.)

Exhibit 99 For Release: August 8, 2023 Investor Contact: Vince Meyer 218-723-3952 NEWS vmeyer@allete.

Rule 13a-14(a)/15d-14(a) Certification by the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(a) Rule 13a-14(a)/15d-14(a) Certification by the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Bethany M.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended June 30, 2023 or ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File Number 1-3548 ALLETE, Inc. (

Mine Safety.

Exhibit 95 Mine Safety Disclosure Mine or Operating Name/MSHA Identification Number Section 104 S&S Citations (#) Section 104(b) Orders (#) Section 104(d) Citations and Orders (#) Section 110(b)(2) Violations (#) Section 107(a) Orders (#) Total Dollar Value of MSHA Assessments Proposed ($) Total Number of Mining Related Fatalities (#) Received Notice of Pattern of Violation Under Section 104(e) (y

1-3548 (June 30, 2023, Form 10-Q)

Exhibit 4 ALLETE, Inc. (formerly Minnesota Power & Light Company and formerly Minnesota Power, Inc.) TO THE BANK OF NEW YORK MELLON (formerly The Bank of New York (formerly Irving Trust Company)) AND JANET LEE (successor to Richard H. West, J. A. Austin, E. J. McCabe, D. W. May, J. A. Vaughan, W. T. Cunningham, Douglas J. MacInnes, Ming Ryan, Philip L. Watson, Andres Serrano and Eva Waite) As Trus

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K (Mark One) x Annual Report Pursuant to Section 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended December 31, 2022

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K (Mark One) x Annual Report Pursuant to Section 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended December 31, 2022 or ¨ Transition Report Pursuant to Section 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File Number 1-3548 ALLETE AND AFFILIATED COMPANIE

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 Date of Report (Date of Earliest Event Reported) - May 9, 2023 ALLETE, Inc. (Exact

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 Date of Report (Date of Earliest Event Reported) - May 9, 2023 ALLETE, Inc. (Exact name of registrant as specified in its charter) Minnesota 1-3548 41-0418150 (State or other jurisdiction of (Commission File Number) (IRS Employer inc

Rule 13a-14(a)/15d-14(a) Certification by the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(b) Rule 13a-14(a)/15d-14(a) Certification by the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Steven W.

ALLETE News Release dated May 3, 2023, announcing 2023 first quarter earnings. (This exhibit has been furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, except as shall be expressly set forth by specific reference in such filing.)

Exhibit 99 For Release: May 3, 2023 Investor Contact: Vince Meyer 218-723-3952 NEWS vmeyer@allete.

Rule 13a-14(a)/15d-14(a) Certification by the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(a) Rule 13a-14(a)/15d-14(a) Certification by the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Bethany M.

Mine Safety.

Exhibit 95 Mine Safety Disclosure Mine or Operating Name/MSHA Identification Number Section 104 S&S Citations (#) Section 104(b) Orders (#) Section 104(d) Citations and Orders (#) Section 110(b)(2) Violations (#) Section 107(a) Orders (#) Total Dollar Value of MSHA Assessments Proposed ($) Total Number of Mining Related Fatalities (#) Received Notice of Pattern of Violation Under Section 104(e) (y

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended March 31, 2023 or ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File Number 1-3548 ALLETE, Inc.

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.) Filed by the Registrant x Filed by a Party other than the Registrant

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.) Filed by the Registrant x Filed by a Party other than the Registrant o Check the appropriate box: o Preliminary Proxy Statement o Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) x Defini

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.) Filed by the Registrant x Filed by a Party other than the Registrant

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.) Filed by the Registrant x Filed by a Party other than the Registrant o Check the appropriate box: o Preliminary Proxy Statement o Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) o Defini

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 Date of Report (Date of Earliest Event Reported) - February 16, 2023 ALLETE, Inc. (

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 Date of Report (Date of Earliest Event Reported) - February 16, 2023 ALLETE, Inc. (Exact name of registrant as specified in its charter) Minnesota 1-3548 41-0418150 (State or other jurisdiction of (Commission File Number) (IRS Employ

Rule 13a-14(a)/15d-14(a) Certification by the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(b) Rule 13a-14(a)/15d-14(a) Certification by the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Steven W.

United States Securities and Exchange Commission Washington, D.C. 20549 Form 10-K (Mark One) ☒ Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

United States Securities and Exchange Commission Washington, D.C. 20549 Form 10-K (Mark One) ☒ Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the 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 Number 1-3548 ALLETE, Inc. (Exact name of

. (This exhibit has been furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, except as shall be expressly set forth by specific reference in such filing.)

Exhibit 99 For Release: February 16, 2023 Investor Contact: Vince Meyer 218-723-3952 NEWS vmeyer@allete.

Form of ALLETE Executive Long-Term Incentive Compensation Plan Performance Share Grant Effective 2023 (filed as Exhibit 10(h)17 to the 2022 Form 10-K, File No. 1-3548).

Exhibit 10(h)17 ALLETE EXECUTIVE LONG-TERM INCENTIVE COMPENSATION PLAN PERFORMANCE SHARE GRANT Name In accordance with the terms of ALLETE’s Executive Long-Term Incentive Compensation Plan, as amended (the "Plan"), and as determined by and through the Executive Compensation Committee of ALLETE’s Board of Directors, ALLETE hereby grants to you (the "Participant") Performance Shares, as set forth be

ALLETE Non-Employee Director Compensation Summary effective January 1, 2023 (filed as Exhibit 10(j)6 to the 2022 Form 10-K, File No. 1-3548).

Exhibit 10(j)6 ALLETE, INC. Non-Employee Director Compensation Effective January 1, 2023 Board Retainers (1) (2) Stock Cash $110,000 $85,000 Committee Cash Retainers (1) (2) Audit Executive Compensation & Human Capital Corporate Governance & Nominating $10,000 $10,000 $10,000 Chair Cash Retainers (1) (2) Audit Executive Compensation & Human Capital Corporate Governance & Nominating $12,000 $7,500

ALLETE Executive Annual Incentive Plan Form of Award Effective 2023 (filed as Exhibit 10(e)8 to the 2022 Form 10-K, File No. 1-3548).

Exhibit 10(e)8 ALLETE Executive Annual Incentive Plan Form of Award Effective 2023 [Eligible Executive Employees] Target Award Opportunity Base Salary $ Times Award Opportunity (percent of base salary) % Equals Target Award $ Performance Levels and Award Amounts Goal Performance Level Payout as Percent of Target Award Award Amount Superior 200% $ Target 100% $ Threshold 44% $ Below Threshold 0% $ Goals Goal Weighting Financial Goals Net Income 50% Cash from Operating Activities 20% Strategic & Operational & Values Goals 30% 100% Compensation Subject to Compensation Recovery Policy Annual Incentive Plan Compensation is subject to recoupment as defined in the Compensation Recovery policy.

Subsidiaries of the Registrant.

Exhibit 21 SUBSIDIARIES OF THE REGISTRANT As of December 31, 2022 Name of Organization (a) State or Country ALLETE, Inc.

ALLETE Executive Annual Incentive Plan Form of Award ALLETE Clean Energy Effective 2023 (filed as Exhibit 10(e)9 to the 2022 Form 10-K, File No. 1-3548).

Exhibit 10(e)9 ALLETE Executive Annual Incentive Plan Form of Award Effective 2023 [Eligible ALLETE Clean Energy Employees] Target Award Opportunity Base Salary $ Times Award Opportunity (percent of base salary) % Equals Target Award $ Performance Levels and Award Amounts Goal Performance Level Payout as Percent of Target Award Award Amount Superior 200% $ Target 100% $ Threshold 50% $ Below Threshold 0% $ Goals Goal Weighting Financial Goals ALLETE Net Income 15% ALLETE Clean Energy Net Income 45% Strategic and Operational & Values Goals 40% 100% Compensation Subject to Compensation Recovery Policy Annual Incentive Plan Compensation is subject to recoupment as defined in the Compensation Recovery policy.

Mine Safety.

Exhibit 95 Mine Safety Disclosure Mine or Operating Name/MSHA Identification Number Section 104 S&S Citations (#) Section 104(b) Orders (#) Section 104(d) Citations and Orders (#) Section 110(b)(2) Violations (#) Section 107(a) Orders (#) Total Dollar Value of MSHA Assessments Proposed ($) Total Number of Mining- Related Fatalities (#) Received Notice of Pattern of Violation Under Section 104(e) (

Form of ALLETE Executive Long-Term Incentive Compensation Plan Restricted Stock Unit Grant Effective 2023 (filed as Exhibit 10(h)16 to the 2022 Form 10-K, File No. 1-3548).

Exhibit 10(h)16 ALLETE EXECUTIVE LONG-TERM INCENTIVE COMPENSATION PLAN RESTRICTED STOCK UNIT GRANT Name In accordance with the terms of ALLETE’s Executive Long-Term Incentive Compensation Plan, as amended (the "Plan"), and as determined by and through the Executive Compensation Committee of ALLETE’s Board of Directors, ALLETE hereby grants to you (the "Participant") Restricted Stock Units (“RSU’s”

Rule 13a-14(a)/15d-14(a) Certification by the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(a) Rule 13a-14(a)/15d-14(a) Certification by the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Bethany M.

ALE / ALLETE Inc / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SC 13G/A 1 tv0007-alleteinc.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: ALLETE Inc. Title of Class of Securities: Common Stock CUSIP Number: 018522300 Date of Event Which Requires Filing of this Statement: December 30, 2022 Check the appropriate box to designate the rule pur

Page 1 of 2 ALLETE, Inc. 30 West Superior Street, Duluth, Minnesota 55802

December 13, 2022 Mr. Ethan Horowitz Accounting Branch Chief United States Securities and Exchange Commission Division of Corporate Finance Washington, D.C. 20549 RE: ALLETE, Inc. Form 10-K for Fiscal Year Ended December 31, 2021 Filed February 16, 2022 Response dated October 26, 2022 Response dated November 18, 2022 File No. 001-03548 Dear Mr. Horowitz: Set forth below is the response of ALLETE,

Page 1 of 2 ALLETE, Inc. 30 West Superior Street, Duluth, Minnesota 55802

November 18, 2022 United States Securities and Exchange Commission Division of Corporate Finance Office of Energy & Transportation Washington, D.

Mine Safety.

Exhibit 95 Mine Safety Disclosure Mine or Operating Name/MSHA Identification Number Section 104 S&S Citations (#) Section 104(b) Orders (#) Section 104(d) Citations and Orders (#) Section 110(b)(2) Violations (#) Section 107(a) Orders (#) Total Dollar Value of MSHA Assessments Proposed ($) Total Number of Mining Related Fatalities (#) Received Notice of Pattern of Violation Under Section 104(e) (y

1-3548 (Sept. 30, 2022, Form 10-Q)

Exhibit 4 ALLETE, Inc. (formerly Minnesota Power & Light Company and formerly Minnesota Power, Inc.) TO THE BANK OF NEW YORK MELLON (formerly The Bank of New York (formerly Irving Trust Company)) AND JANET LEE (successor to Richard H. West, J. A. Austin, E. J. McCabe, D. W. May, J. A. Vaughan, W. T. Cunningham, Douglas J. MacInnes, Ming Ryan, Philip L. Watson, Andres Serrano and Eva Waite) As Trus

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended September 30, 2022 or ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File Number 1-3548 ALLETE, I

quarter earnings. (This exhibit has been furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, except as shall be expressly set forth by specific reference in such filing.)

Exhibit 99 For Release: November 9, 2022 Investor Contact: Vince Meyer 218-723-3952 NEWS vmeyer@allete.

Rule 13a-14(a)/15d-14(a) Certification by the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(b) Rule 13a-14(a)/15d-14(a) Certification by the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Steven W.

Rule 13a-14(a)/15d-14(a) Certification by the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(a) Rule 13a-14(a)/15d-14(a) Certification by the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Bethany M.

Page 1 of 4 ALLETE, Inc. 30 West Superior Street, Duluth, Minnesota 55802

CORRESP 1 filename1.htm October 26, 2022 United States Securities and Exchange Commission Division of Corporate Finance Office of Energy & Transportation Washington, D.C. 20549 RE: ALLETE, Inc. Form 10-K for Fiscal Year Ended December 31, 2021 Filed February 16, 2022 File No. 001-03548 Dear Mr. Horowitz: Set forth below is the response of ALLETE, Inc. to the comments of the staff (the “Staff”) of

Page 1 of 1 ALLETE, Inc. · 30 West Superior Street, Duluth, Minnesota 55802

CORRESP 1 filename1.htm September 28, 2022 United States Securities and Exchange Commission Division of Corporate Finance Office of Energy & Transportation Washington, D.C. 20549 RE: ALLETE, Inc. Form 10-K for Fiscal Year Ended December 31, 2021 Filed February 16, 2022 File No. 001-03548 Dear Ms. Majmudar and Mr. Horowitz: We acknowledge receipt of your comment letter dated September 21, 2022, reg

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 Date of Report (Date of Earliest Event Reported) - August 22, 2022 ALLETE, Inc. (Exact name of registrant as specified in its charter) Minnesota 1-3548 41-0418150 (State or other jurisdiction of (Commission File Number) (IRS Employer

Rule 13a-14(a)/15d-14(a) Certification by the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(a) Rule 13a-14(a)/15d-14(a) Certification by the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Bethany M.

Rule 13a-14(a)/15d-14(a) Certification by the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(b) Rule 13a-14(a)/15d-14(a) Certification by the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Steven W.

Mine Safety.

Exhibit 95 Mine Safety Disclosure Mine or Operating Name/MSHA Identification Number Section 104 S&S Citations (#) Section 104(b) Orders (#) Section 104(d) Citations and Orders (#) Section 110(b)(2) Violations (#) Section 107(a) Orders (#) Total Dollar Value of MSHA Assessments Proposed ($) Total Number of Mining Related Fatalities (#) Received Notice of Pattern of Violation Under Section 104(e) (y

ALLETE News Release dated August 3, 2022, announcing 2022 second quarter earnings. (This exhibit has been furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, except as shall be expressly set forth by specific reference in such filing.)

Exhibit 99 For Release: August 3, 2022 Investor Contact: Vince Meyer 218-723-3952 NEWS vmeyer@allete.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ? Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended June 30, 2022 or ? Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File Number 1-3548 ALLETE, Inc. (

AMENDMENT NO. 1 TO FOURTH AMENDED AND RESTATED DISTRIBUTION AGREEMENT

Exhibit 1(d) AMENDMENT NO. 1 TO FOURTH AMENDED AND RESTATED DISTRIBUTION AGREEMENT August 5, 2016 Lampert Capital Markets, Inc. 477 Madison Avenue, Ste. 230 New York, NY 10022 Attention: Randy Lampert Ladies and Gentlemen: Reference is hereby made to that certain Fourth Amended and Restated Distribution Agreement, dated February 25, 2015, between the parties hereto and thereto (the ?Fourth Amended

Amendment No. 2 to Fourth Amended and Restated Distribution Agreement between ALLETE, Inc. and Lampert Capital Markets, Inc., dated May 6, 2020 (filed as Exhibit 1(e), File No. 333-266383).

Exhibit 1(e) AMENDMENT NO. 2 TO FOURTH AMENDED AND RESTATED DISTRIBUTION AGREEMENT May 6, 2020 Lampert Capital Markets, Inc. 477 Madison Avenue, Ste. 230 New York, NY 10022 Attention: Randy Lampert Ladies and Gentlemen: Reference is hereby made to that certain Fourth Amended and Restated Distribution Agreement, dated February 25, 2015, between the parties hereto and thereto, as amended by Amendmen

As filed with the Securities and Exchange Commission on July 29, 2022

As filed with the Securities and Exchange Commission on July 29, 2022 Registration Statement No.

Statement of Eligibility on Form T‑2 of

Exhibit 25(b) UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-2 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF AN INDIVIDUAL DESIGNATED TO ACT AS TRUSTEE CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b)(2) [ ] JANET LEE (Name of trustee) 240 Greenwich Street Floor 7E New York, NY 10286 (Business address: stre

Consent of Independent Registered Public Accounting Firm.

Exhibit 23(a) CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We hereby consent to the incorporation by reference in this Registration Statement on Form S-3 of ALLETE, Inc.

, of Margaret A. Thickens, Esq., Vice President, Chief Legal Counsel and Corporate Secretary of ALLETE.

Exhibit 5(a) MARGARET A. THICKENS Vice President, Chief Legal Officer and Corporate Secretary 218-723-3950 E-mail [email protected] July 28, 2022 ALLETE, Inc. 30 West Superior Street Duluth, Minnesota 55802 Ladies and Gentlemen: Reference is made to the Registration Statement on Form S?3 (the ?Registration Statement?) to be filed by ALLETE, Inc. (?Company?), on or about the date hereof, with th

Form of Amendment No. 3 to Fourth Amended and Restated Distribution Agreement between ALLETE, Inc. and Lampert Capital Markets, Inc.

Exhibit 1(f) AMENDMENT NO. 3 TO FOURTH AMENDED AND RESTATED DISTRIBUTION AGREEMENT , 202 Lampert Capital Markets, Inc. 444 Madison Avenue, 4th Floor New York, NY 10022 Attention: Randy Lampert Ladies and Gentlemen: Reference is hereby made to that certain Fourth Amended and Restated Distribution Agreement, dated February 25, 2015, between the parties hereto and thereto, as amended by Amendment No.

Calculation of Filing Fee Tables Form S-3 (Form Type) ALLETE, Inc. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities and Carry Forward Securities Security type Security class title Fee calculation or carry fo

Exhibit 107 Calculation of Filing Fee Tables Form S-3 (Form Type) ALLETE, Inc. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities and Carry Forward Securities Security type Security class title Fee calculation or carry forward rule Amount registered Proposed maximum offering price per unit Maximum aggregate offering price Fee rate Amount of registration fee

Consent of Morgan, Lewis & Bockius LLP (included in opinion, attached hereto as Exhibit 5(b)).

Exhibit 5(b) July 28, 2022 ALLETE, Inc. 30 West Superior Street Duluth, Minnesota 55802 Ladies and Gentlemen: Reference is made to the Registration Statement on Form S?3 (the ?Registration Statement?) to be filed by ALLETE, Inc. (?Company?), on or about the date hereof, with the Securities and Exchange Commission (?Commission?) under the Securities Act of 1933, as amended (?Securities Act?), for t

Statement of Eligibility on Form T‑1 of The Bank of New York Mellon with respect to the Mortgage.

Exhibit 25(a) 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 YORK MELLON (Exact name of trustee as specified in its charter) New York (Jurisdicti

Form of Supplemental Indenture relating to the first mortgage bonds.

Exhibit 4(c)(3) ALLETE, Inc. (formerly Minnesota Power & Light Company and formerly Minnesota Power, Inc.) TO THE BANK OF NEW YORK MELLON (formerly The Bank of New York (formerly Irving Trust Company)) AND JANET LEE (successor to Richard H. West, J. A. Austin, E. J. McCabe, D. W. May, J. A. Vaughan, W. T. Cunningham, Douglas J. MacInnes, Ming Ryan, Philip L. Watson, Andres Serrano and Eva Waite) A

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 Date of Report (Date of Earliest Event Reported) - July 6, 2022 ALLETE, Inc. (Exact name of registrant as specified in its charter) Minnesota 1-3548 41-0418150 (State or other jurisdiction of (Commission File Number) (IRS Employer in

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K (Mark One) x Annual Report Pursuant to Section 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended December 31, 2021

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K (Mark One) x Annual Report Pursuant to Section 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended December 31, 2021 or ? Transition Report Pursuant to Section 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File Number 1-3548 ALLETE AND AFFILIATED COMPANIE

Consent of Morgan, Lewis & Bockius LLP (included in opinion, attached hereto as Exhibit 5(b)).

Exhibit 5(b) May 25, 2022 ALLETE, Inc. 30 West Superior Street Duluth, Minnesota 55802-2093 Ladies and Gentlemen: Reference is made to the Registration Statement on Form S‑8 (the “Registration Statement”) to be filed by ALLETE, Inc. (“Company”), on or about the date hereof, with the Securities and Exchange Commission (“Commission”) under the Securities Act of 1933, as amended (“Securities Act”), f

As filed with the Securities and Exchange Commission on May 25, 2022

As filed with the Securities and Exchange Commission on May 25, 2022 Registration Statement No.

Consent of Independent Registered Public Accounting Firm of PricewaterhouseCoopers LLP.

Exhibit 23(a) CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We hereby consent to the incorporation by reference in this Registration Statement on Form S-8 of ALLETE, Inc.

Filing Fee Table.

Exhibit 107 Calculation of Filing Fee Tables Form S-8 (Form Type) ALLETE, Inc. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities and Carry Forward Securities Security type Security class title Fee calculation or carry forward rule Amount registered (1) Proposed maximum offering price per unit (2) Maximum aggregate offering price (2) Fee rate Amount of regi

Amended and Restated ALLETE Non-Employee Director Stock Plan, effective May 10, 2022 (filed as Exhibit 99 to Form S-8, File No. 333-265211).

EX-99 6 exhibit99.htm EX-99 Exhibit 99 ALLETE NON-EMPLOYEE DIRECTOR STOCK PLAN (As Amended and Restated Effective May 10, 2022) Exhibit 99 ALLETE NON-EMPLOYEE DIRECTOR STOCK PLAN (As Amended and Restated Effective May 10, 2022) Article 1 Establishment and Purpose This document includes the terms of the ALLETE Non-Employee Director Stock Plan (the “Plan”), the purpose of which is to provide ownersh

, of Margaret A. Thickens, Esq., Vice President, Chief Legal Counsel and Corporate Secretary of ALLETE.

Exhibit 5(a) Margaret A. Thickens Vice President, Chief Legal Officer and Corporate Secretary May 25, 2022 ALLETE, Inc. 30 West Superior Street Duluth, Minnesota 55802?2093 Ladies and Gentlemen: Reference is made to the Registration Statement on Form S?8 (the ?Registration Statement?) to be filed by ALLETE, Inc. (?Company?), on or about the date hereof, with the Securities and Exchange Commission

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 Date of Report (Date of Earliest Event Reported) - May 10, 2022 ALLETE, Inc. (Exact name of registrant as specified in its charter) Minnesota 1-3548 41-0418150 (State or other jurisdiction of (Commission File Number) (IRS Employer in

Rule 13a-14(a)/15d-14(a) Certification by the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(a) Rule 13a-14(a)/15d-14(a) Certification by the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Bethany M.

Mine Safety.

Exhibit 95 Mine Safety Disclosure Mine or Operating Name/MSHA Identification Number Section 104 S&S Citations (#) Section 104(b) Orders (#) Section 104(d) Citations and Orders (#) Section 110(b)(2) Violations (#) Section 107(a) Orders (#) Total Dollar Value of MSHA Assessments Proposed ($) Total Number of Mining Related Fatalities (#) Received Notice of Pattern of Violation Under Section 104(e) (y

quarter earnings. (This exhibit has been furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, except as shall be expressly set forth by specific reference in such filing.)

Exhibit 99 For Release: May 5, 2022 Investor Contact: Vince Meyer 218-723-3952 NEWS vmeyer@allete.

Rule 13a-14(a)/15d-14(a) Certification by the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(b) Rule 13a-14(a)/15d-14(a) Certification by the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Steven W.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ? Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended March 31, 2022 or ? Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File Number 1-3548 ALLETE, 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 Date of Report (Date of Earliest Event Reported) - April 5, 2022 ALLETE, Inc. (Exact name of registrant as specified in its charter) Minnesota 1-3548 41-0418150 (State or other jurisdiction of (Commission File Number) (IRS Employer i

Underwriting Agreement, dated March 31, 2022, among ALLETE, Inc., J.P. Morgan Securities LLC and BofA Securities,

EX-1 2 ex-1underwritingagreement.htm EX-1 ALLETE, INC. 3,200,000 Shares of Common Stock Underwriting Agreement March 31, 2022 J.P. Morgan Securities LLC BofA Securities, Inc. As Representatives of the several Underwriters listed in Schedule 1 hereto c/o J.P. Morgan Securities LLC 383 Madison Avenue New York, New York 10179 c/o BofA Securities, Inc. One Bryant Park New York, New York 10036 Ladies a

Calculation of Filing Fee Tables (1) Form 424(b)(2) (Form Type) ALLETE, Inc. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities and Carry Forward Securities

? Exhibit 107? Calculation of Filing Fee Tables (1) Form 424(b)(2) (Form Type) ALLETE, Inc.

3,200,000 Shares ALLETE, Inc. Common Stock

424B2 1 tm2210855-2424b2.htm 424B2 TABLE OF CONTENTS  Filed pursuant to Rule 424(b)(2)  Registration Statement No: 333-232905 PROSPECTUS SUPPLEMENT (To prospectus dated July 31, 2019) 3,200,000 Shares ALLETE, Inc. Common Stock We are offering 3,200,000 shares of our common stock, without par value. Our common stock is listed on the New York Stock Exchange under the symbol “ALE.” On March 30, 2022,

Subject to completion, dated March 31, 2022

TABLE OF CONTENTS The information in this prospectus supplement is not complete and may be changed.

definitive proxy statement for our 2022 Annual Meeting of Shareholders filed on March 24, 2022

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.) Filed by the Registrant x Filed by a Party other than the Registrant o Check the appropriate box: o Preliminary Proxy Statement o Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) x Defini

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.) Filed by the Registrant x Filed by a Party other than the Registrant

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.) Filed by the Registrant x Filed by a Party other than the Registrant o Check the appropriate box: o Preliminary Proxy Statement o Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) o Defini

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant, 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 Date of Report (Date of Earliest Event Reported) - February 28, 2022 ALLETE, Inc. (Exact name of registrant as specified in its charter) Minnesota 1-3548 41-0418150 (State or other jurisdiction of (Commission File Number) (IRS Employ

ALLETE and Affiliated Companies Supplemental Executive Retirement Plan II (SERP II), as amended and restated, effective January 1, 2021 (filed as Exhibit 10(f)5 to the 2021 Form 10-K, File No. 1-3548)

Exhibit 10(f)5 ALLETE AND AFFILIATED COMPANIES SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN II Amended and Restated Effective January 1, 2021 Exhibit 10(f)5 TABLE OF CONTENTS Page ARTICLE 1 Establishment and Purpose 2 1.

ALLETE Non-Employee Director Compensation Summary effective January 1, 2022 (filed as Exhibit 10(k)4 to the 2021 Form 10-K, File No. 1-3548).

Exhibit 10(k)4 ALLETE, INC. Non-Employee Director Compensation Effective January 1, 2022 Board Retainers (1) (2) Stock Cash $97,500 $80,000 Committee Cash Retainers (1) (2) Audit Executive Compensation Corporate Governance & Nominating $9,000 $7,500 $7,500 Chair Cash Retainers (1) (2) Audit Executive Compensation Corporate Governance & Nominating $10,000 $7,500 $5,000 Lead Director (1) (2) (3) Boa

ALLETE News Release dated February 16, 2022, announcing earnings for the year ended December 31, 2021. (This exhibit has been furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, except as shall be expressly set forth by specific reference in such filing.)

Exhibit 99 For Release: February 16, 2022 Investor Contact: Vince Meyer 218-723-3952 vmeyer@allete.

Filing Fee Table.

Exhibit 107 Calculation of Filing Fee Tables Form S-3 (Form Type) ALLETE, Inc. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities and Carry Forward Securities Security type Security class title Fee calculation or carry forward rule Amount registered Proposed maximum offering price per unit Maximum aggregate offering price Fee rate Amount of registration fee

Consent of Morgan, Lewis & Bockius LLP (included in opinion, attached hereto as Exhibit 5(b)).

Exhibit 5(b) February 16, 2022 ALLETE, Inc. 30 West Superior Street Duluth, Minnesota 55802 Ladies and Gentlemen: Reference is made to the Registration Statement on Form S-3 (the “Registration Statement”) to be filed by ALLETE, Inc. (“Company”), on or about the date hereof, with the Securities and Exchange Commission (“Commission”) under the Securities Act of 1933, as amended (“Securities Act”), f

ALLETE Executive Annual Incentive Plan Form of Award Effective 2022 (filed as Exhibit 10(e)9 to the 2021 Form 10-K, File No. 1-3548).

Exhibit 10(e)9 ALLETE Executive Annual Incentive Plan Form of Award Effective 2022 [Eligible Executive Employees] Target Award Opportunity Base Salary $ Times Award Opportunity (percent of base salary) % Equals Target Award $ Performance Levels and Award Amounts Goal Performance Level Payout as Percent of Target Award Award Amount Superior 200% $ Target 100% $ Threshold 44% $ Below Threshold 0% $ Goals Goal Weighting Financial Goals Net Income 50% Cash from Operating Activities 20% Strategic & Operational & Values Goals 30% 100% Compensation Subject to Compensation Recovery Policy Annual Incentive Plan Compensation is subject to recoupment as defined in the Compensation Recovery policy.

Rule 13a-14(a)/15d-14(a) Certification by the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(b) Rule 13a-14(a)/15d-14(a) Certification by the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Steven W.

Subsidiaries of the Registrant.

Exhibit 21 SUBSIDIARIES OF THE REGISTRANT As of December 31, 2021 Name of Organization (a) State or Country ALLETE, Inc.

Regulation FD Disclosure

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 Date of Report (Date of Earliest Event Reported) - February 16, 2022 ALLETE, Inc. (Exact name of registrant as specified in its charter) Minnesota 1-3548 41-0418150 (State or other jurisdiction of (Commission File Number) (IRS Employ

Form of ALLETE Executive Long-Term Incentive Compensation Plan Restricted Stock Unit Grant Effective 2022 (filed as Exhibit 10(i)17 to the 2021 Form 10-K, File No. 1-3548).

Exhibit 10(i)17 ALLETE EXECUTIVE LONG-TERM INCENTIVE COMPENSATION PLAN RESTRICTED STOCK UNIT GRANT [Effective 2022] [Eligible Executive Employees] Name In accordance with the terms of ALLETE?s Executive Long-Term Incentive Compensation Plan, as amended (the "Plan"), and as determined by and through the Executive Compensation Committee of ALLETE?s Board of Directors, ALLETE hereby grants to you (th

As filed with the Securities and Exchange Commission on February 16, 2022

As filed with the Securities and Exchange Commission on February 16, 2022 Registration Statement No.

Consent of Independent Registered Public Accounting Firm.

Exhibit 23(a) CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We hereby consent to the incorporation by reference in this Registration Statement on Form S-3 of ALLETE, Inc.

Form of ALLETE Executive Long-Term Incentive Compensation Plan Performance Share Grant Effective 2022 (filed as Exhibit 10(i)18 to the 2021 Form 10-K, File No. 1-3548).

Exhibit 10(i)18 ALLETE EXECUTIVE LONG-TERM INCENTIVE COMPENSATION PLAN PERFORMANCE SHARE GRANT [Effective 2022] [Eligible Executive Employees] Name In accordance with the terms of ALLETE?s Executive Long-Term Incentive Compensation Plan, as amended (the "Plan"), and as determined by and through the Executive Compensation Committee of ALLETE?s Board of Directors, ALLETE hereby grants to you (the "P

, of Margaret A. Thickens, Esq., Vice President, Chief Legal Counsel and Corporate Secretary of ALLETE.

Exhibit 5(a) MARGARET A. THICKENS Vice President, Chief Legal Officer and Corporate Secretary 218-723-3950 E-mail [email protected] February 16, 2022 ALLETE, Inc. 30 West Superior Street Duluth, Minnesota 55802 Ladies and Gentlemen: Reference is made to the Registration Statement on Form S?3 (the ?Registration Statement?) to be filed by ALLETE, Inc. (?Company?), on or about the date hereof, wit

Rule 13a-14(a)/15d-14(a) Certification by the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(a) Rule 13a-14(a)/15d-14(a) Certification by the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Bethany M.

Second Amendment to Credit Agreement dated November 23, 2021, among ALLETE, as Borrower, the lenders party thereto, and JPMorgan Chase Bank, N.A., as Administrative Agent. (filed as Exhibit 10(b)3 to the 2021 Form 10-K, File No. 1-3548).

Exhibit 10(b)3 SECOND AMENDMENT TO CREDIT AGREEMENT THIS SECOND AMENDMENT TO CREDIT AGREEMENT dated as of November 23, 2021 (this ?Amendment?) is among ALLETE, INC.

Mine Safety.

Exhibit 95 Mine Safety Disclosure Mine or Operating Name/MSHA Identification Number Section 104 S&S Citations (#) Section 104(b) Orders (#) Section 104(d) Citations and Orders (#) Section 110(b)(2) Violations (#) Section 107(a) Orders (#) Total Dollar Value of MSHA Assessments Proposed ($) Total Number of Mining- Related Fatalities (#) Received Notice of Pattern of Violation Under Section 104(e) (

United States Securities and Exchange Commission Washington, D.C. 20549 Form 10-K (Mark One) ☒ Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

United States Securities and Exchange Commission Washington, D.C. 20549 Form 10-K (Mark One) ? Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the 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 Number 1-3548 ALLETE, Inc. (Exact name of

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 Date of Report (Date of Earliest Event Reported) - February 9, 2022 ALLETE, Inc. (Exact name of registrant as specified in its charter) Minnesota 1-3548 41-0418150 (State or other jurisdiction of (Commission File Number) (IRS Employe

ALE / ALLETE 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: ALLETE Inc. Title of Class of Securities: Common Stock CUSIP Number: 018522300 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: ??Rule 1

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, 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 Date of Report (Date of Earliest Event Reported) - February 1, 2022 ALLETE, Inc. (Exact name of registrant as specified in its charter) Minnesota 1-3548 41-0418150 (State or other jurisdiction of (Commission File Number) (IRS Employe

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 Date of Report (Date of Earliest Event Reported) - January 11, 2022 ALLETE, Inc. (Exact name of registrant as specified in its charter) Minnesota 1-3548 41-0418150 (State or other jurisdiction of (Commission File Number) (IRS Employe

quarter earnings. (This exhibit has been furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, except as shall be expressly set forth by specific reference in such filing.)

Exhibit 99 For Release: November 4, 2021 Investor Contact: Vince Meyer 218-723-3952 NEWS vmeyer@allete.

Rule 13a-14(a)/15d-14(a) Certification by the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(a) Rule 13a-14(a)/15d-14(a) Certification by the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Bethany M.

Rule 13a-14(a)/15d-14(a) Certification by the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(b) Rule 13a-14(a)/15d-14(a) Certification by the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Robert J.

1-3548 (Sept. 30, 2021, Form 10-Q)

EX-4 2 ale9-30x2021exx4.htm EX-4 Exhibit 4 ALLETE, Inc. (formerly Minnesota Power & Light Company and formerly Minnesota Power, Inc.) TO THE BANK OF NEW YORK MELLON (formerly The Bank of New York (formerly Irving Trust Company)) AND Eva Waite (successor to Richard H. West, J. A. Austin, E. J. McCabe, D. W. May, J. A. Vaughan, W. T. Cunningham, Douglas J. MacInnes, Ming Ryan, Philip L. Watson and A

Mine Safety.

EX-95 6 ale9-30x2021exx95.htm EX-95 Exhibit 95 Mine Safety Disclosure Mine or Operating Name/MSHA Identification Number Section 104 S&S Citations (#) Section 104(b) Orders (#) Section 104(d) Citations and Orders (#) Section 110(b)(2) Violations (#) Section 107(a) Orders (#) Total Dollar Value of MSHA Assessments Proposed ($) Total Number of Mining Related Fatalities (#) Received Notice of Pattern

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ? Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended September 30, 2021 or ? Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File Number 1-3548 ALLETE, I

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 Date of Report (Date of Earliest Event Reported) - October 1, 2021 ALLETE, Inc. (Exact name of registrant as specified in its charter) Minnesota 1-3548 41-0418150 (State or other jurisdiction of (Commission File Number) (IRS Employer

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 Date of Report (Date of Earliest Event Reported) - September 22, 2021 ALLETE, Inc. (Exact name of registrant as specified in its charter) Minnesota 1-3548 41-0418150 (State or other jurisdiction of (Commission File Number) (IRS Emplo

ALLETE announces third partner in Nemadji Trail Energy Center Project Basin Electric joins Dairyland Power and ALLETE as an investor and owner of the planned Superior, WI plant

Exhibit 99 For Release: September 28, 2021 Investor Contact: Vince Meyer 218-723-3952 NEWS vmeyer@allete.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ? Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended June 30, 2021 or ? Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File Number 1-3548 ALLETE, Inc. (

Rule 13a-14(a)/15d-14(a) Certification by the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(a) Rule 13a-14(a)/15d-14(a) Certification by the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Bethany M.

Rule 13a-14(a)/15d-14(a) Certification by the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(b) Rule 13a-14(a)/15d-14(a) Certification by the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Robert J.

1-3548 (June 30, 2021, Form 10-Q)

EX-4.A 2 ale6-30x2021exx4a.htm EX-4.A Exhibit 4A Execution Copy SUPERIOR WATER, LIGHT AND POWER COMPANY 2915 Hill Avenue, Superior, WI 54880 To U.S. BANK NATIONAL ASSOCIATION (formerly First Bank (N.A.)) As Trustee Under Superior Water, Light and Power Company's Mortgage and Deed of Trust, Dated as of March 1, 1943 FOURTEENTH SUPPLEMENTAL INDENTURE Dated as of June 14, 2021 This instrument drafted

Mine Safety.

EX-95 7 ale6-30x2021exx95.htm EX-95 Exhibit 95 Mine Safety Disclosure Mine or Operating Name/MSHA Identification Number Section 104 S&S Citations (#) Section 104(b) Orders (#) Section 104(d) Citations and Orders (#) Section 110(b)(2) Violations (#) Section 107(a) Orders (#) Total Dollar Value of MSHA Assessments Proposed ($) Total Number of Mining Related Fatalities (#) Received Notice of Pattern

quarter earnings. (This exhibit has been furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, except as shall be expressly set forth by specific reference in such filing.)

EX-99 8 ale6-30x2021exx99.htm EX-99 Exhibit 99 For Release: August 4, 2021 Investor Contact: Vince Meyer 218-723-3952 NEWS [email protected] ALLETE, Inc. reports second quarter earnings of 53 cents per share DULUTH, Minn. - ALLETE, Inc. (NYSE: ALE) today reported second quarter 2021 earnings of 53 cents per share on net income of $27.9 million. Last year’s results were 39 cents per share on net in

1-3548 (June 30, 2021, Form 10-Q)

EX-4.B 3 ale6-30x2021exx4b.htm EX-4.B Exhibit 4B Execution Copy SUPERIOR WATER, LIGHT AND POWER COMPANY 2915 Hill Avenue, Superior, WI 54880 To U.S. BANK NATIONAL ASSOCIATION (formerly First Bank (N.A.)) As Trustee Under Superior Water, Light and Power Company's Mortgage and Deed of Trust, Dated as of March 1, 1943 FIFTEENTH SUPPLEMENTAL INDENTURE Dated as of June 14, 2021 This instrument drafted

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K/A (Mark One) x Annual Report Pursuant to Section 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended December 31, 2020

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K/A (Mark One) x Annual Report Pursuant to Section 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended December 31, 2020 or ? Transition Report Pursuant to Section 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File Number 1-3548 ALLETE AND AFFILIATED COMPAN

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K (Mark One) x Annual Report Pursuant to Section 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended December 31, 2020

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K (Mark One) x Annual Report Pursuant to Section 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended December 31, 2020 or ? Transition Report Pursuant to Section 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File Number 1-3548 ALLETE AND AFFILIATED COMPANIE

Bethany M. Owen named Chair of ALLETE Board of Directors

Exhibit 99 For Release: May 11, 2021 Contact: Amy Rutledge Mgr. Corporate Comm. NEWS [email protected] Bethany M. Owen named Chair of ALLETE Board of Directors Duluth, Minn. ? The ALLETE Inc. (NYSE:ALE) board of directors has named President and Chief Executive Officer Bethany M. Owen chair of the ALLETE board of directors effective May 11, 2021. Owen has served as ALLETE?s president since 2019

Regulation FD Disclosure, Financial Statements and Exhibits, Other Events, 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 Date of Report (Date of Earliest Event Reported) - May 11, 2021 ALLETE, Inc. (Exact name of registrant as specified in its charter) Minnesota 1-3548 41-0418150 (State or other jurisdiction of (Commission File Number) (IRS Employer in

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ? Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended March 31, 2021 or ? Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File Number 1-3548 ALLETE, Inc.

Rule 13a-14(a)/15d-14(a) Certification by the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(a) Rule 13a-14(a)/15d-14(a) Certification by the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Bethany M.

Mine Safety.

Exhibit 95 Mine Safety Disclosure Mine or Operating Name/MSHA Identification Number Section 104 S&S Citations (#) Section 104(b) Orders (#) Section 104(d) Citations and Orders (#) Section 110(b)(2) Violations (#) Section 107(a) Orders (#) Total Dollar Value of MSHA Assessments Proposed ($) Total Number of Mining Related Fatalities (#) Received Notice of Pattern of Violation Under Section 104(e) (y

Rule 13a-14(a)/15d-14(a) Certification by the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(b) Rule 13a-14(a)/15d-14(a) Certification by the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Robert J.

quarter earnings. (This exhibit has been furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, except as shall be expressly set forth by specific reference in such filing.)

EX-99 6 ale3-31x2021exx99.htm EX-99 Exhibit 99 For Release: Date: May 6, 2021 Investor Contact: Vince Meyer 218-723-3952 NEWS [email protected] ALLETE, Inc. reports first quarter earnings of 99 cents per share Reaffirms 2021 earnings guidance range of $3.00 - $3.30 per share DULUTH, Minn. - ALLETE, Inc. (NYSE: ALE) today reported first quarter 2021 earnings of 99 cents per share on net income of $

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 11)*

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 11)* Name of issuer: ALLETE Inc. Title of Class of Securities: Common Stock CUSIP Number: 018522300 Date of Event Which Requires Filing of this Statement: March 31, 2021 Check the appropriate box to designate the rule pursuant to which this Schedule is filed: ??Rule 13d-

- DEFA14A

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.) Filed by the Registrant x Filed by a Party other than the Registrant o Check the appropriate box: o Preliminary Proxy Statement o Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) o Defini

- DEF 14A

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.) Filed by the Registrant x Filed by a Party other than the Registrant o Check the appropriate box: o Preliminary Proxy Statement o Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) x Defini