National energy stability has a very important role in support of the national development sustainable. However, the problem is often the rate of energy availability not balanced with the rate of energy needs, therefore it is necessary to do the efficiency of energy consumption on the user side. The industrial sector becomes the largest energy consumer in Indonesia. In this study author will conduct analysis energy efficiency potential by raising a case of study on one of the garment industry in semarang, namely PT. SAI Apparel. The energy efficiency will be based on production and energy consumption data during 2016, and evaluate the measurement of the electrical power quality. Based on the results of data analysis obtained from PT. SAI Apparel, it is known that electric power quality values for current imbalance parameters, voltage imbalance, and power factor have values that are not in accordance with the standard and risk increase the loss of power. Based on the analysis of electrical power quality of PT. SAI Apparel is known some quantity of power quality of PT. SAI Apparel has values that are not in accordance with the standards and risk increase the loss of power. Seeing these conditions obtained three energy saving recommendations that can be implemented at PT. SAI Apparel, that is.RST phase load balancing to reduce voltage and current imbalance, replacement of TL lamp by using LED lamp will produce energy saving 449.687kWh/year, replacement sewing machine induction motor with servo motor will produce energy saving 616.223kWh/ year, and improvement of the power factor will produce energy savings 5.774, 5kWh/year.