Mich. Comp. Laws § 18.1254

Sec. 254. (1) Upon the request of a state agency, the public service commission shall provide to the state agency a certificate of energy cost savings based upon actual energy use and cost data as provided to the commission by the state agency. (2) At the close of each fiscal year, the amount of any unencumbered balance of a state appropriation for fuel or utilities to a state agency which resulted due to energy management actions as certified by the public service commission, as provided in subsection (1), shall be distributed as follows: (a) 75% of the energy cost savings, as certified by the commission, shall be carried forward to the next fiscal year and allocated to a special energy conservation work order or work project account to be used for energy conservation measures in the facilities of the state agency to which the certificate was issued. (b) The remaining unencumbered balance shall be credited to the fund from which appropriated.