The LCOE of brownfield CO 2 -based power plants is less than the LCOE of water-based power plants for almost the entire parameter space, with some small exceptions (e.g., the upper righthand corner of Figure ). As a result, Figure demonstrates, for the first time, that using CO 2 as the heat extraction fluid in sedimentary basin geothermal power plants (i.e. CPG power plants) has cost advantages compared to using water. Further, the reservoir data of Figure suggests that most sedimentary basins in the U.S. could be used to generate electricity at a lower cost with brownfield CO 2 -based power plants compared to water-based power plants, and some even with a greenfield CO 2 -based power plant.