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This research is about optimizing the dry-system geothermal power plant. To optimizing the performance of a Geothermal Power Plant (PLTP) can be done in various ways, one method which can be use is add an Organic Rankine Cycle (ORC). The ORC would be install on the PLTP turbine output. Use the heat of the steam that come out after expansion process in the turbine to evaporated the working fluid (WF) on the ORC evaporator. The ORC is consisting of 4 main systems or components, Evaporator system, Turbine system, Condenser and Pumping system and the Reservoir Tank as additional equipment. Choose R290 as working fluid (WF) among four other candidates such as R134a, R600, R600a, and R152a. The ORC system optimization is focused on the number of WF masses that can generated on the ORC evaporator system. The ORC analysis results in a total energy of 11589 kW with thermal efficiency of 17%. Energy produced by ORC can increase PLTP energy production by 9%.