Mich. Comp. Laws § 460.844

Sec. 44. (1) A joint agency may sell or exchange the excess capacity or output of a project not required by any of its members for consideration upon terms and conditions as determined by the parties. (2) A joint agency may do 1 or more of the following: (a) Transfer all or part of its interest in or functional control of transmission facilities to a multistate regional transmission system organization approved by the federal government and operating in this state or to 1 or more of its transmission-owning members. (b) Purchase, acquire, sell, or otherwise transfer stock, membership units, or any other interest in a multistate regional transmission system organization approved by the federal government and operating in this state or in 1 or more of its transmission-owning members.