Michigan constitution
Article IX
Section 5

The legislature shall provide for the assessment by the state of the property of those
public service businesses assessed by the state at the date this constitution becomes effective,
and of other property as designated by the legislature, and for the imposition and collection of
taxes thereon. Property assessed by the state shall be assessed at the same proportion of its
true cash value as the legislature shall specify for property subject to general ad valorem taxation.
The rate of taxation on such property shall be the average rate levied upon other commercial,
industrial, and utility property in this state under the general ad valorem tax law, or, if the
legislature provides, the rate of tax applicable to the property of each business enterprise
assessed by the state shall be the average rate of ad valorem taxation levied upon other
commercial, industrial, and utility property in all counties in which any of such property is
situated.