Mich. Comp. Laws § 483.3

Sec. 3. (1) Subject to subsection (2), the commission is granted the power to control, investigate, and regulate a person doing any of the following: (a) Exercising or claiming the right to carry or transport crude oil or petroleum, or any of the products thereof, or carbon dioxide substances, by or through pipe line or lines, for hire, compensation, or otherwise within this state. (b) Exercising or claiming the right to engage in the business of piping, transporting, or storing crude oil or petroleum, or any of the products thereof, or carbon dioxide substances within this state. (c) Engaging in the business of buying, selling, or dealing in crude oil or petroleum or carbon dioxide substances within this state. (2) Producers or refiners of crude oil or petroleum or carbon dioxide substances or operators of private trunk or gathering lines or other methods of conveying those products, are not subject to this act if the nature and extent of their business is private and no public interest is involved in the conduct of the business.