St. Michaels Utilities Commission and Commissioners of St. Michaels, Maryland, Petitioners, v. Federal Power Commission, Respondent.delmarva Power & Light Company, Delmarva Power & Light Company of Maryland, and Delmarva Power & Light Company of Virginia, and Accomac-northampton Electric Cooperative, Choptank Electric Cooperative, Inc., and Delaware Electric Cooperative, Inc., Intervenors.stockton Light & Power Company of Maryland, and Stockton Light & Power Company of Virginia, Petitioners, v. Federal Power Commission, Respondent.delmarva Power & Light Company, Delmarva Power & Light Company of Maryland, and Delmarva Power & Light Company of Virginia, Accomac-northampton Electric Cooperative, and Choptank Electric Cooperative, Inc., and Delaware Electric Cooperative, Inc., Intervenors