The report describes motor systems and their potential to be a cost-effective source for industrial energy efficiency savings. A major barrier to effective policymaking, and to more global acceptance of the energy efficiency potential in industrial motor systems, is the lack of a transparent methodology for quantifying the magnitude and cost-effectiveness of these energy savings. This report presents the results of groundbreaking analyses conducted for five countries and one region to begin to address this barrier. Using a combination of expert opinion and available data from the United States, Canada, the European Union, Thailand, Vietnam, and Brazil, bottom-up Energy Efficiency Supply Curve models were constructed to estimate the cost-effective electricity efficiency potentials and CO2 emission reduction for three types of motor systems (compressed air, pumping, and fan).