Only advantage of DAC is that it decouples location of point source and carbon removal/storage and may make siting easier. But it's going to use more energy at higher cost every time.
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It's actually one scenario that we're preparing for, when DAC is more mature. We can capture CO2 at mine sites and store it there at large scale, avoiding the high costs associated with CO2 transport and handling. However, the efficiencies and costs of DACs need to come down before this makes sense.
I do wonder if we’ll start to see industrial siting take CCS geology into account in coming decades. Some evidence that’s already happening in US ethanol industry (by coincidence, not planning).
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Equipping gas fired backup plants with CCS is:
* CAPEX-intensive (given the low runtime of the plants - very different for baseload stuff like cement) and
* the extra energy for CCS must also come from fossil gas as there is no clean power available that moment
But we might have other problems at that point.