Using photovoltaic arrays made of polysilicon isn't the only, or even the most efficient, way to turn the power of the sun into electricity. A rising form of heliocentric electrical generation is called Concentrated Solar Power (CSP).
The basic concept is simple. Use mirrors to focus heat from the Sun's rays on a small area that contains water or some other liquid. The heat is transferred to the liquid, which then turns a generator and creates electricity. Sort of like cooking a hot dog over one of those backyard solar oven kits but writ very, very large.
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