Nos. 78-1099, 78-1105. Argued September 11, 1978. Decided December 18, 1978. R. Malcolm Graham, Boston, Mass. with whom Melvin Pierce, Frank Giso, III, and Peabody, Brown, Rowley Storey, Boston, Mass., were on brief, for Western Massachusetts Elec. Co. Peter M. Bernstein, Atty., Washington, D.C., with whom John S. Irving, Gen. Counsel, John E. Higgins, Jr., Deputy Gen. Counsel, Carl L. Taylor, Assoc. Gen. Counsel, Elliott Moore, Deputy Assoc. Gen. Counsel, and Susan Tepper Papadopoulos, Atty., Washington