Investor Presentaiton

Forward looking statement Any statements contained in this presentation and statements that ALLETE, Inc. representatives may make orally in connection with this presentation that are not historical facts are forward-looking statements. Actual results may differ materially from those projected in the forward-looking statements. These forward-looking statements involve risks and uncertainties and investors are directed to the risks discussed in documents filed by ALLETE, Inc. with the Securities and Exchange Commission. ALLETE's presentation and other communications may include certain non-Generally Accepted Accounting Principles (GAAP) financial measures. A "non-GAAP financial measure" is defined as a numerical measure of a company's financial performance, financial position or cash flows that excludes (or includes) amounts that are included in (or excluded from) the most directly comparable measure calculated and presented in accordance with GAAP in the company's financial statements. Non-GAAP financial measures utilized by the Company may include presentations of earnings (loss) per share and earnings before interest, taxes, depreciation and amortization. ALLETE's management believes that these non-GAAP financial measures provide useful information to investors by removing the effect of variances in GAAP reported results of operations that are not indicative of changes in the fundamental earnings power of the Company's operations. Management believes that the presentation of the non-GAAP financial measures is appropriate and enables investors and analysts to more accurately compare the company's ongoing financial performance over the periods presented. This presentation was prepared as of November 9, 2020, and ALLETE, Inc. assumes no obligation to update the information or the forward-looking statements contained herein. The 2020 outlook contained herein was provided, and is as of, November 9, 2020. For more information, contact: Vince Meyer Director, Investor Relations and Treasury (218) 723-3952 [email protected] Visit our website at www.allete.com 2 ALLETE

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