Mich. Comp. Laws § 460.845: Eminent domain.

Sec. 45.

A joint agency may take private property under Act No. 149 of the Public Acts of 1911, as amended, or any other applicable law as determined necessary by a joint agency for carrying out its purpose, except that a joint agency shall not exercise its power of eminent domain to acquire an existing electrical generation or transmission facility or a part thereof held in private ownership, including, without limitation, nonprofit corporation, without first securing in writing the approval of the lawful private owner or owners.