Detroit Edison Company, Duke Power Company, Gulf Powercompany, Kansas Gas & Electric Company, Mississippi Power &light Company, Pacific Gas & Electric Company, Potomacelectric Power Company, San Diego Gas & Electric Company,savannah Electric & Power Company, South Carolina Electric &gas Company, Southern California Edison Company,southwestern Electric Power Company, Wisconsin Power & Lightcompany, Wisconsin Public Service Corporation, Plaintiffs-appellants, v. Pacific Insurance Company, Defendant-appellee,andsed, Incorporated, James B. Caldwell, John H. Olmsted, Defendants