Figure shows there is wide variability in O&M cost fraction, between roughly 1% and 12%, and when only geothermal facilities are included, this range only decreases slightly to between 3% and 12%. It is worth noting that O&M costs reported from within the geothermal industry (i.e. Sanyal (2004; 2007), Calpine, and Ormat) have higher O&M cost fractions than typically used sources such as Lazard and GETEM. Sanyal (2004) and Sanyal et al. (2007) are published works of GeothermEx, a Schlumberger geothermal consulting company that cooperates closely with the Geysers. The Geysers is operated by Calpine and is the largest geothermal installation in the world. Conversely, the O&M fraction from Calpine (2020) is lower than Sanyal (2004). This may be attributed to the small fraction of geothermal generation within Calpine's generation portfolio. Only ~3% of Calpine's generation is geothermal, the remainder are fossil facilities. When more than one cost fraction is provided, the error bars in Figure and the variation in Table show the range which contains 95% of data points. For GETEM and GEOPHIRES, this range is determined by simulating geothermal resources between 125°C and 200°C and capacities between 1 MW e and 100 MW e for a depth of 2.5 km. For the Neff (2019) and Lazard (2019) sources, the variability represents the results from all combinations of capital cost, capacity factor, and O&M costs given. The NETL (2012) dataset contains eight data points representing 550 MW e coal, IGCC, and NGCC plants both with and without CO₂ capture.