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" Efficient fuel cells for recovering energy from hydrogen gas oxidation are an available technology"I would like to query this do not fuel cells require expensive and rare metals as a catalyst and very pure Hydrogen.
On balance, I feel that the silicon technology is well worth further exploration, mainly because I am one of a large minority who thinks that the hydrogen economy is a blind alley.
I did question the usefulness of consuming useful energy to produce 48% (demonstrated) or 68% (project plan) of the useful energy that you started with. [CSIRO] pointed out that the advantage came in the possibility of storing the energy for consumption at a place and/or time where it was more needed. If you use excess off-peak generated electricity to pump water from low storage to high storage and then use the hydro power to boost generation for peak demand, the energy efficiency is about 15%-25%, so 48%-68% represents a huge advance, but only if you have also addressed storing/safe handling issues.