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Efficiency is not everything, pumped storage is for instance only 60% efficient. The forte of the liquid air storage is its capability to drive very cheap, reliable and compact engines, and if combined with fossil fuels, this power could be variable & admirable. So it could find its niche uses in peaking plants, harbor tugs, heavy cranes, floating docks, emergency pumps in nuke plants, fire truck pumps, etc., but in cars hardly. Its energy density and efficiency are too low, and its evaporation too fast.
Posted by praoss