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It would require about 31 hectares of corn ethanol to produce the same amount of energy generated by 1 ha of solar panels
(www.anthropocenemagazine.org)
Everything about energy production and storage.
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I'm surprised that the difference is apparently that low considering the efficiency of photosynthesis vs the photovoltaic effect, the fact that not all of the plant gets turned into ethanol, and the efficiency of the combustion process.