1. There are more geologic conditions in which the LCOE of CO 2 -based power plants are less than water-based power plants. The LCOE for brownfield CO 2 -based power plants is less than the LCOE for water-based power plants for almost every geologic condition we investigated except for basins with depths greater than about 5 km and transmissivities above about 10,000 mD-m (Figure ). Assuming p50 USGS data, all sedimentary basins in the U.S. have conditions in which brownfield CO 2 -based power plants cost less than water-based power plants and many where greenfield CO 2 plants cost less than water-based power plants (Figure ).