Mich. Comp. Laws § 123.101

Sec. 1. That it shall be lawful for any city or incorporated village in this state not having more than 10,000 inhabitants, which now own and operate works for the purpose of supplying such city or village with electric light and lighting their streets and other public places with electric light, to furnish and supply electric light to the inhabitants of such cities or villages upon such terms and under such conditions as the common council may deem expedient.