Michigan Compiled Laws, Chapter 141. Municipal Financing § 141.1163

(a) The tax shall be imposed on all intrastate telephone communication services, furnished by a public utility. The term “intrastate telephone communication services” shall not include any telephone service originating or terminating outside Michigan, telephone services by coin-operated installations, directory advertising proceeds, telephone services not taxable under section 4251 of Title 26 of the United States Code as of December 31, 1969, as amended, centrex and multi-line key switching systems, mobile telephone service, and any types of services or equipment, furnished by telephone companies subject to public utility regulation, during any period in which such services or equipment are in competition with services or equipment furnished by or available from persons other than telephone companies subject to public utility regulation.

(b) The tax shall be on all electrical energy and steam provided by a public utility or a resale customer. The term “electrical energy and steam provided” shall include amounts paid for metered energy and steam, and minimum charges for service, including user charges, service charges, demand charges, standby charges, and annual and monthly charges. The term shall not include electrical energy or steam sold to or exchanged with for resale by, another public utility, or used or consumed in the conduct of the business of an electric or steam public utility or a combination gas and electric utility.

(c) The tax shall be on all gas, natural or artificial provided by a public utility or a resale customer. The term “gas, natural or artificial provided” shall not include any gas sold for use in the generation of electrical energy by a public utility, any gas sold to or exchanged with for resale by, another gas public utility, or any gas used or consumed in the conduct of the business of a gas public utility or a combination gas and electric utility.