We introduced a new hierarchy for classifying DAC technologies that supports understanding of the key DAC performance indicators and the quality of the underlying data, on which claims on energy requirements and future cost can be built. We then harmonized available energy and cost data, to allow for a like-for-like comparison between DAC technologies with available data. We conclude that there is a wide gap between companies' future cost estimates of below USD100/tCO 2 removal and a path to achieve this objective.