Section R. 460.872 - DiscriminationRule 22.
(1) Common purchasers and common carriers are expressly prohibited from discrimination in amount of gas taken, price paid for or rates charged for like grades of natural gas or facilities as between producers or persons; and if a common purchaser or common carrier is likewise a producer, it shall not discriminate in favor of its own production or of production in which it may be interested directly or indirectly. The commission shall have authority to relieve any such common purchaser or common carrier, after due application, notice and hearing, from the obligation of purchasing or receiving gas from wells which due to variation in quality and pressure, or for economic reasons, are not at the time a practicable source of supply.(2) Except in cases where exigency of service requires emergency measures, common purchasers or common carriers shall not abandon nor curtail withdrawals or purchases of gas from any pool or section of pool in favor of another pool or section thereof, because of temporary or permanent decline in reservoir or producing pressure without having first received the approval of the commission.Mich. Admin. Code R. 460.872