Mich. Comp. Laws § 460.1009

Sec. 9. As used in this act: (a) "Natural gas provider" means an investor-owned business engaged in the sale and distribution at retail of natural gas within this state whose rates are regulated by the commission. (b) "Pet coke" means a solid carbonaceous residue produced from a coker after cracking and distillation from petroleum refining operations. (c) "Provider" means an electric provider or a natural gas provider. (d) "PURPA" means the public utility regulatory policies act of 1978, Public Law 95-617.