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SEMCO ENERGY, Inc. distributes natural gas to approximately 461,402 customers combined in Michigan and Alaska. It owns and operates businesses involved in natural gas distribution, propane distribution, intrastate pipelines and natural gas storage.

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SEMCO ENERGY GAS COMPANY provides natural gas and associated services and products to more than 312,524 combined residential, commercial and industrial customers in Michigan. Its chief markets are in the populous southeastern, central, western and northern regions of Michigan.
ENSTAR NATURAL GAS is the sole provider of natural gas and associated services to more than 148,878 customers in Anchorage, Alaska, and the growing areas surrounding the Cook Inlet, constituting approximately half of the total Alaskan population. As the only natural gas distribution and transmission system in the area, it has the highest usage per residential customer among investor- owned utilities.