4 1 form4dwt.txt FORM 4 FOR DWT FOR PERIOD ENDED 04/21/03 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 4 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP [ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. 1. Name and Address of Reporting Person(s) Thomason, Donald W. 1105 Capital Avenue, S.W. Battle Creek, MI 49015 2. Issuer Name and Ticker or Trading Symbol SEMCO Energy, Inc. (SEN) 3. I.R.S. Identification Number of Reporting Person, if an entity (Voluntary) 4. Statement for Month/Day/Year 4/21/2003 5. If Amendment, Date of Original (Month/Day/Year) 6. Relationship of Reporting Person(s) to Issuer (Check all applicable) [X] Director [ ] 10% Owner [ ] Officer (give title below) [ ] Other (specify below) 7. Individual or Joint/Group Filing (Check Applicable Line) [X] Form filed by One Reporting Person [ ] Form filed by More than One Reporting Person

SIGNATURE OF REPORTING PERSON /S/ By: Sherry L. Abbott For: Donald W. Thomason DATE 04/22/03

THOMASON DONALD W 4