Electric motors are by far the biggest consumers of energy produced in the world. According to the Department of Energy, of the total energy produced in the U.S., about 60 percent to 65 percent is consumed by electric motors. Among the largest components of this are home and commercial refrigeration appliances and HVAC systems. It is estimated that by building more efficient drives, the U.S. can save about 25 percent in home refrigeration costs, 80 percent in HVAC costs and about 60 percent in pump and fan control costs.