Adequate and reliable supply of energy is required to ensure sustainable development of anyrncountry. However, the use and conversion of primary energy results in energy waste, high costrnenergy and emission. In addition, developing countries (like Ethiopia) have low awareness onrnenergy conservation and faced to generate more energy rather than to use the existing energyrnefficiently. This studies on energy utilization and efficiency improvement opportunities ofrnMessebo cement factory. It aims to improve the energy efficiency of the factory by proposingrnenergy conservation options such as improving energy intensive equipments such as lightingrnsystem and electric motors of the factory.rnFor the purpose of data analysis, a historical data regarding their energy consumption and energyrnintensive equipments, such as electric motors and lighting systems were collected. Energyrnefficient cement plants were selected as a benchmark to compare the energy efficiency of thernfactory. As the result of data analysis the factory looses 34% of their total energy (electrical andrnfuel) due to inefficient consumption and pays 45,197,841.70 birr per annum. The factoryrnaccomplishes its activities with excess and inefficient lamps and also with low efficiency ofrnelectric motor due to under load operating of the motor for the specific application.rnBy optimizing the illumination of the existing lighting system 49.87MWh of energy is saved perrnannum. The respective annual cost saving is 24,936.80 birr. Another way of improving thernlighting system is through replacement of existing lamps with energy efficient lamps 49.02rnMWh/year of energy is saved and the respective annual cost saving is 24,510.5 birr.rnIn this study, MotorMaster + international software used to select a proper electric motor inrnterms of efficiency, cost effectiveness & energy saving potential. The simulation result fromrnMotorMaster + international also shows that through replacing low energy efficiency of electricrnmotors 275.5MWh of energy is saved and the respective annual cost saving is 218,970 birr perrnannum with small payback period.rnKey Word: Cement industry, energy utilization, energy efficiency, energy efficiencyrnimprovement opportunities, MotorMaster + international software and energy saving