Gday Peter
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so it appears that the novelty in the system is within the thermal storage stages.
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I think part of it is also going back to ( relatively) efficent piston based steam engines. By doing this, they get efficiency at low pressure and hence the storage mechanisms become simpler and cheaper.
They never claimed to be able to replace large scale base power but they do seem to be aiming for maybe small towns or rural industry type applications. Still looks very interesting.
Andrew