Solar power is an intermittent energy source. It’s only available when the sun is “up” and even then it’s best on cloudless days. It would be difficult to rely soley on solar power, but at the same time every day there is enough solar energy striking the planet to supply all the “energy” needs our society currently uses. Solar energy is fetchingly attractive in many ways and the obvious thing to mitigate solar energy’s intermittency is through energy storage.

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