United Gas Improvement Company, Philadelphia Electriccompany, Petitioners in No. 12,797, v. Federal Power Commission, Respondent.public Service Commission of the State of New York,petitioner in No. 12,805, v. Federal Power Commission, Respondent.pan American Petroleum Corporation, Atlantic Refiningcompany, Cities Service Production Company, Humble Oil &refining Company, Ohio Oil Company, Oil Participationsincorporated, Tidewater Oil Company, Transcontinental Gaspipe Line Corporation, Continental Oil Company, Magnoliapetroleum Company, Pure Oil Company, Sun Oil Company, Unionoil Company of California, W. H. Hunt, Trustee for Hassiehunt Trust, Phillips Petroleum Company, Intervenors