EXHIBIT  21
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                               SEMCO ENERGY, INC.

                              List of Subsidiaries
                         Exhibit 21 to Form 10-K (2001)


As of December 31, 2001, the subsidiaries of SEMCO Energy, Inc. (the Registrant)
were:


- --    Alaska  Pipeline  Company,  an  Alaska  corporation
- --   NORSTAR  Pipeline  Company,  Inc.,  an  Alaska corporation (a subsidiary of
Alaska  Pipeline  Company)
- --   Aretech  Information  Services,  Inc.,  a  Michigan  corporation
- --   Hotflame  Gas,  Inc.,  a  Michigan  corporation
- --   NATCOMM,  Inc.,  a  Michigan  corporation
- --   Flint Construction Company, a Georgia corporation (a subsidiary of NATCOMM,
Inc.)
- --   Iowa  Pipeline  Associates,  Inc.,  a Michigan corporation (a subsidiary of
NATCOMM,  Inc.)
- --   K  &  B  Construction,  Inc.,  a  Kansas  corporation (a subsidiary of Iowa
Pipeline  Associates,  Inc.)
- --   KLP  Construction  Co., Inc., an Illinois corporation (a subsidiary of Iowa
Pipeline  Associates,  Inc.)
- --   Long's Underground Technologies, Inc., a Michigan corporation (a subsidiary
of  NATCOMM,  Inc.)
- --   NATCOMM Engineering, Inc., a Michigan corporation (a subsidiary of NATCOMM,
Inc.)
- --   Maverick  Pipeline  Services, Inc., a Michigan corporation (a subsidiary of
NATCOMM  Engineering,  Inc.)
- --   Oilfield  Materials Consultants, Inc., a Michigan corporation (a subsidiary
of  NATCOMM  Engineering,  Inc.)
- --   Sub-Surface  Construction  Co.,  a  Michigan  corporation  (a subsidiary of
NATCOMM,  Inc.)
- --   SEMCO  Energy  Ventures,  Inc.,  a  Michigan  corporation
- --   SEMCO  Arkansas  Pipeline  Company, a Michigan corporation (a subsidiary of
SEMCO  Energy  Ventures,  Inc.)
- --   SEMCO  Gas  Storage  Company, a Michigan corporation (a subsidiary of SEMCO
Energy  Ventures,  Inc.)
- --   SEMCO  Pipeline  Company,  a  Michigan  corporation  (a subsidiary of SEMCO
Energy  Ventures,  Inc.)
- --   Southeastern  Development  Company, a Michigan corporation (a subsidiary of
SEMCO  Energy  Ventures,  Inc.)
- --   Southeastern Financial Services, Inc., a Michigan corporation (a subsidiary
of  SEMCO  Energy  Ventures,  Inc.)


Each  of  the  above-listed  companies  does  business only under its respective
corporate  name  as  indicated  above,  except  as  follows:

- --   SEMCO  Energy,  Inc.  does business in Alaska under the name ENSTAR Natural
Gas  Company  and  in  Michigan  as  SEMCO  Energy  Gas  Company.
- --   Aretech Information Services, Inc. does business in Michigan under the name
Arenet.net  and  Arenet.
- --   Oilfield  Materials Consultants, Inc. does business in Texas under the name
Michigan  Oilfield  Materials  Consultants,  Inc.
- --   Sub-Surface  Construction  Co.  does  business  in  Ohio under the name Sub
Surface  Gas  Services  and  Main  Construction  Co.