EXHIBIT 1 AGREEMENT AND PLAN OF MERGER BETWEEN YANKEE ENERGY SYSTEM, INC. AND NORTHEAST UTILITIES dated as of June 14, 1999 AGREEMENT AND PLAN OF MERGER, dated as of June 14, 1999 (this "Agreement"), between Yankee Energy System, Inc., a Connecticut...Merger Agreement • June 16th, 1999 • Northeast Utilities System • Electric services
