Developing CO₂-based power plants (i.e. CPG power plants) requires a substantial amount of geologic CO 2 storage. For example, realizing the lowest cost 5 GW e (131% of current installed U.S. geothermal capacity) of electricity generation capacity in Figure with CO 2 would require geologically storing approximately 40 GtCO 2 . The amount of CO 2 required for power generation varies across sedimentary basins based on the porosity of the reservoir, and our results suggest this requirement ranges from 0.14 to 0.48 MW e /MtCO 2 (inverse of slope of blue lines in Figure ).