In geothermal power plants, the production mass flowrate can be set to maximize power or minimize cost. For this reason, the default setting in genGEO is to optimize the heat extraction mass flowrate based on the user inputs. This feature is an improvement upon the method used within GEOPHIRES or GETEM, which respectively require the user to specify the mass flowrate as an input or use a default value of 110 kg/s per well that can be changed if desired.