Solar Power After Sunset

Clean, renewable energy. No dependence on foreign oil. The advantages seem clear… when the sun is shining.  But what about after dark?  One increasingly effective way to use solar power after sunset is to have photovoltaic cells charge batteries. There are some interesting new batteries being developed, including Tesla’s Powerwall. Another way is using molten salt to store the energy, like the Crescent Dunes Project. During the day, solar energy heats up the salt, which is then stored in insulated containers. Whenever there’s demand, the heat makes steam which drives turbines. It’s beginning to seem silly not to use the sun.

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