Mich. Comp. Laws § 79.11
The respective actions of the councils of all villages organized under the general laws of the state, heretofore granting franchises to and making contracts with persons or corporations to use the streets, alleys and public places of such villages for the purpose of supplying such villages or the inhabitants thereof or both, with gas, electric light or other lights for periods of time exceeding 10 years, but not exceeding 30 years, are hereby legalized and made valid: Provided, however, That the action of the said respective councils of said villages granting the said franchises shall have been approved by 3/5 of the electors of such villages voting thereon, at a regular or special municipal election as required by section 25 of article 8 of the constitution of this state.
MCL 79.11