For example, the GETEM turbine-generator cost is limited to a minimum value with growing capacity which is not consistent with other sources (Figure ), and the turbine costs substantially contributes to total LCOE (e.g. 4% in Figure ). Similarly, GETEM assumes an overall heat transfer coefficient which reduces the heat exchanger cost by a factor of 2 to 4, compared to other sources (Section S3.2.4). We also found a wide variability in reported O&M costs (see Section S4 in the SI) and when we assumed a reasonable estimate of 5.5% based on these data, O&M contributed to about half of LCOE (Figure ). There is generally little discussion of O&M costs throughout the geothermal energy community broadly, and our findings suggest that this cost, and others (e.g. turbines, cooling towers, etc.), should be more thoroughly examined.