The motion to substitute Humble Oil & Refining Company, a Delaware corporation, in the place of Humble Oil & Refining Company, a Texas corporation, as a party respondent, is granted. The motions of Public Service Electric and Gas Company and the Alabama League of Municipalities for leave to file briefs, as amici curiae, are granted.

*197The petitions for writs of certiorari are granted. The judgment of the Court of Appeals is vacated and the cases are remanded to that court with directions to remand the cases to the Federal Power Commission for reconsideration and redetermination in the light of Atlantic Refining Co. v. Public Service Commission of New York, 360 U. S. 378.