Distributor of natural gas to residential, commercial and industrial customers in Michigan and Alaska. The company through its subsidiaries SEMCO Energy Gas and Enstar Natural Gas, distributes natural gas in the U.S. SEMCO Energy Gas distributes natural gas to 282,500 customers in 24 counties in Michigan's upper and lower peninsulas. ENSTAR Natural Gas Company distributes natural gas to approximately 126,000 customers in the Anchorage, Alaska area. The company also has operations and investments in information technology services, propane distribution, intrastate natural gas pipelines and a natural gas storage facility. Its operations include propane distribution in Michigan and Wisconsin; pipeline and storage facility operation and information technology outsourcing.