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Synthetic methane production has a theoretical maximum efficiency of 30-40%. So we'd need to build 3x as much power and is actually needed, and a bunch of electrolysis and Sabatier reaction plants on top of that.

Or we can just follow France's example and build nuclear plants.

Those numbers are outdated. Round-trip efficiencies of up to 80% have been claimed:


If that's legit and can be made cost-effective, the case for nuclear is largely gone...

Efficiencies of over 100% have been claimed. Over 50% of the US patent office's applications are for entropy-reversing devices.

Come back to me once these claimed figures are actually implemented.

Reverse fuel cells aren't magic, though. I agree that 80% seems rather ambitous...

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