EXHIBIT 23 Consent of Independent Public Accountants We hereby consent to the incorporation by reference in the Registration Statements on Form S-3 (No. 333-18927, 333-58715, 333-91406, 333-91815 and 333-103674) of SEMCO Energy, Inc. of our report dated February 10, 2003 relating to the financial statements, which appears in the Annual Report to Shareholders, which is incorporated in this Annual Report on Form 10-K. We also consent to the incorporation by reference of our report dated February 10, 2003 relating to the financial statement schedule, which appears in this Form 10-K. PricewaterhouseCoopers LLP Detroit, Michigan March 13, 2003