SEMCO ENERGY Gas serves more than 266,000 customers in 24 counties in Michigan's upper and lower peninsulas. The company provides residential, commercial and industrial services. SEMCO ENERGY Gas is headquartered in Port Huron, Mich. It is a division of SEMCO ENERGY, which is also headquartered in Port Huron, and is a company that distributes natural gas to more than 391,000 customers in Michigan and Alaska. The company owns and operates businesses involved in propane distribution, intrastate pipelines and natural gas storage in various regions of the United States. In addition, it provides information technology and outsourcing services, specializing in the mid-range computer market.