In this study, we address this knowledge gap by developing and using the generalizable GEOthermal simulator (genGEO), which can estimate the electricity generation and cost of geothermal power plants. genGEO is built from the bottom-up using publicly available data and is comprised of five standalone, but integrated, models: 1) a geologic model to simulate reservoir pressure and temperature change, 2) a well model that simulates the energy and pressure loss (or gain) of fluid flowing to and from the subsurface, 3) a power cycle model that thermodynamically simulates electricity generation, 4) a capital cost model that estimates the capital cost of the geothermal power plant, and 5) a levelized cost of electricity (LCOE) model that estimates the LCOE of the geothermal power plant, which is a standard metric for cost throughout the electricity sector.