The level of energy and peak demand savings that could be achieved in New York State over a period of 10 to 20 years as a result of cost-effective utility conservation programs is examined in this report. Conservation programs at Niagara Mohawk, Consolidated Edison and Long Island Lighting Company were analyzed for energy and demand savings, costs and cost- effectiveness. Prepared for the New York State Energy Research and Development Authority (NY residents may request the report directly from NYSERDA).