Exhibit 5(b) THELEN REID & PRIEST LLP NEW YORK ATTORNEYS AT LAW SAN FRANCISCO 40 WEST 57TH STREET WASHINGTON, D.C. NEW YORK, N.Y. 10019-4097 LOS ANGELES TEL (212) 603-2000 FAX (212) 603-2001 SILICON VALLEY www. thelenreid.com MORRISTOWN, N.J. June 27, 2002 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. (the "Company"), on or about the date hereof with the Securities and Exchange Commission under the Securities Act of 1933, as amended, for the registration of 46,481 shares of the Company's common stock, without par value ("Common Stock"), and the Preferred Share Purchase Rights attached thereto ("Rights"), which were issued pursuant to the Stock Exchange Agreement, dated as of May 10, 2002, by and among the Company, ALLETE Automotive Services, Inc., ADESA Corporation, ADESA Southern Indiana, Inc. and Gary G. Pedigo. In connection therewith, we have reviewed such documents and records as we have deemed necessary to enable us to express an opinion on the matters covered hereby. Based upon the foregoing, we are of the opinion that: 1. The Company is a corporation validly organized and existing under the laws of the State of Minnesota. 2. The Common Stock has been validly issued, and is fully paid and non-assessable. 3. The Rights have been validly issued in accordance with the terms of the Rights Agreement, dated as of July 24, 1996 ("Rights Agreement"), between the Company and the Corporate Secretary of the Company, as Rights Agent. The opinion set forth in paragraph 3 above with respect to the Rights is limited to the valid issuance of the Rights under the corporation laws of the State of Minnesota. In this connection, we have not been asked to express, and accordingly do not express, any opinion herein with respect to any other aspect of the Rights, the effect of any equitable principles or fiduciary considerations relating to the adoption of the Rights Agreement or the issuance of the Rights or the enforceability of any particular provision of the Rights Agreement. We are members of the New York Bar and do not hold ourselves out as experts on the laws of the State of Minnesota. As to all matters of Minnesota law, we have relied with your consent upon an opinion of even date herewith June 27, 2002 Page 2 addressed to you by Philip R. Halverson, Esq., Vice President, General Counsel and Secretary of the Company. We hereby consent to the filing of this opinion as an exhibit to the Registration Statement. We also consent to the reference to us in the Prospectus included in the Registration Statement under the caption "Legal Opinions." In giving the foregoing consents, we do not hereby admit that we belong to the class of persons whose consent is required under Section 7 of the Securities Act, or the rules and regulations promulgated thereunder. Very truly yours, /s/ Thelen Reid & Priest LLP THELEN REID & PRIEST LLP