Quote:
Originally Posted by P-hack
The efficiency of any storage solution is of course of primary concern, and is limited by physics. Not sure "synthetic CNG" is all that efficient, though I have not looked into it.
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While the laws of physics mean we lose useable energy in any energy conversion, this is energy that'd otherwise have been lost (currently, excess energy is being destroyed if no further production unit can be throttled down or shut down) or not generated at all (shutting down the windmill, reducing its lifetime efficiency).
Audi uses CO2 to make CH4 - for carbon, that's a balanced one-for-one situation. Ideally, not considering conversion losses.
But as the plant is run on wind energy, the losses are also renewable, rather than simply
gone forever when fossil fuel is used.