Coal Seams Not So Efficient

A correspondent mentioned a recent article he had read – probably in New Scientist – which reported on the efficiency of coal seams in capturing and storing solar energy. He couldn’t retrieve the article at the time, but it calculated that less than 0.1% of the solar energy originally captured by plants has actually made its way into coal.

So that means that a coal-fired power station, at about 40% thermal efficiency, is actually 0.04% efficient, in terms of primary solar energy. Since solar panels turn about 10-12% of the solar energy that falls on them into electricity, they leave coal in the dust.

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