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Today the supply of fossil energy resources which is increasingly depleting will have a significant impact on every aspect of life in Indonesia. One attempt to overcome this problem by using the Organic Rankine Cycle (ORC) Cycle System. The types of refrigerants used in this study were R141b, R123 and R245fa using Aspen plus software simulation. This research focused on journal review and using aspen plus software simulation using the working fluid refrigerant R141b, R123, and R245fa on the ORC as a 1 kW scale electric energy generating machine. The results obtained from the simulation using aspen software plus Organic cycle Rankine Cycle (ORC) using a working fluid refrigerant R141b, R245fa, and R123 at a pressure of 3 bar to a pressure of 11 bar at a temperature of 95 degree Celcius. The maximum efficiency produced is 8.65 %, 7.79 %, and 8.36 %. Turbine power produced 1005 watts, 896 watts and 770 watts From the simulation results used in the Organic Cycle Rankine Cycle R245fa has the efficiency value that is best used as a 1 kW electric energy generating plant with an efficiency value of 8.65 %.