Figure shows the learning curve ranges obtained from the analysis for the United States paired with intermittent renewable electricity for comparison to Figure and provides a key insight. The ranges in Figure are much larger than the ranges in Figure , essentially due to the large range of intermittent renewable capacity factors across the United States, indicating that pairing DACS to intermittent renewables is unlikely to be cost-effective unless the renewable electricity comes from installations with high capacity factors, like some offshore wind installations as implied in Figure . This counters the argument that DACS could run on cheap curtailed renewable energy, for instance, as the sharing of the capital investment over the total amount of CO2 removed would be insufficient. Ideally, DACS would run constantly on an almost completely decarbonised grid. Email: jpy1@hw.ac.uk RCCS, Heriot-Watt University