Michigan Compiled Laws, Chapter 460. Public Utilities § 460.552

Sec. 2. The Michigan public utilities commission, hereinafter referred to as “the commission” shall have control and supervision of the business of transmitting and supplying electricity as mentioned in the first section of this act and no public utility supplying electricity shall put into force any rate or charge for the same without first petitioning said commission for authority to initiate or put into force such rate or charge and securing the affirmative action of the commission approving said rate or charge.