Mich. Comp. Laws § 388.1764f

Sec. 164f. The intermediate board of an intermediate district, the board of a district, or the board of directors of a public school academy may use funds appropriated under this article to enter into a swap, hedge, derivative, or similar agreement in connection with the procurement of diesel fuel. However, not more than 25% of a district's, public school academy's, or intermediate district's annual diesel fuel budget may be procured in the manner allowed under this section.