Petal Gas Storage, L.L.C. v. Federal Energy Regulatory Commission

Opinion for the Court filed by Circuit Judge BROWN.

BROWN, Circuit Judge:

This case features two natural gas pipeline companies, Petal Gas Storage, L.L.C., and High Island Offshore System, L.L.C., that challenge ratemaking orders from the Federal Energy Regulatory Commission. The chief issue — the only one Petal and HIOS share in common, and the one that brings the Interstate Natural Gas Association of America (representing most of North America’s natural gas transportation companies) into this case as interve-nor — is whether the Commission erred in its selection of the “proxy groups” used to…