While GETEM uses an excel MACRO code to minimize cost, it is difficult to verify or investigate this optimization because it is deeply embedded within the tool and relies on unpublished ASPEN simulations. Further, GEOPHIRES built its characterized ASPEN simulation results using a maximum-power optimization method. Our findings suggest that these differences can result in a wide range of ORC costs, especially at production temperatures below 140°C (Figure ), which could have further ramifications to increased cost estimates for entire facilities (Figure ).