Appliances Washers Cold water washes and rinses save a tremendous amount of electricity – 85 to 90% of energy used is to heat water. Use your washing machine after 8 p.m. when electricity demand is less. Use only the water level you really need. When buying a new model, look for an ENERGY STAR qualified front-load model to reduce water use by almost 45% and energy use by about 65%. More Do laundry only when you have a full load. Consider a compact model if your usual laundry loads are small.