Court of Appeals for the Fifth Circuit September 15, 1975, 75-1496, 75-1748, 75-1498, 75-1740, 75-1519, 75-1765 and 75-2232 (Continental Oil Company, the Superior Oil Company, Mitchell Energy Corporation, and Mapco Inc. v. Federal Power Commission)

CLARK, Circuit Judge:

Acting under its rulemaking power and after notice, the Federal Power Commission (FPC) issued Order No. 521, requiring disclosure by interstate natural gas companies of detailed intrastate sales information, including the names of purchasers, date and location of the sale, pressure base, annual sales volume and price terms.