The condenser pressure is assumed to be 7.381 kPa at steady-state operating conditions. However, it is essential to study the effect of this pressure on the overall system performances. Hence, Fig. 12 depicts the effect of condenser pressure on the power plant energetic and exergetic efficiencies. At lower condenser pressures, higher system efficiencies are observed. For instance, the energetic efficiencies of the single, double, triple, and quadruple power plants increase from 26.3%, 23.6%, 22.3%, and 21.6% to 31.2%, 28.9%, 27.7%, and 27.1%, respectively, as the condenser pressure is varied from 12 kPa to 2.7 kPa. Similarly, the exergetic efficiencies of these plants increase from 67.2%, 64.9%, 63.8%, and 63.2% to 83.1%, 82.54%, 82.51%, and 82.55%, respectively, for the same change in condenser pressure. This is attributed to an increase in turbine power outputs. As the condenser pressure is lowered, the turbine power outputs increase, hence resulting in higher system energetic and exergetic efficiencies. It is thus recommended to conduct a comprehensive thermodynamic study of geothermal power plants and determine the optimum operating parameters that can be implemented to achieve optimal system performances.