This paper analyses the consequences of the Energy Efficient Act, which is foreseen to take effect in 2010. These new Brazilian MEPS are compatible with those implemented in other countries. The cost-benefit analysis, considered for different scenarios for industrial consumers, showed that motor substitution (from standard to high efficiency) is generally advantageous. A sample of 9,000 industrial motors has been used, with measured operation in actual conditions, to analyze the investment cost benefit in three different scenarios. This analysis also demonstrated the benefit of motor substitution, with an average megawatt-hour cost from US$20 to US$35 and with only a few substitutions presenting an unfavorable cost-benefit relationship to the user.