The large reflecting mirrors that you see when driving by are concentrating the solar energy, and generating heat. This heat eventually boils water, which produces steam; the expansion of the steam forces the fan blades of a turbine to rotate. At the center of the turbine, spinning magnets generate an electric current. At this power plant, the heat from the sun is actually used to melt salt into a molten liquid first. This pool of molten salt acts like a giant battery, storing the energy so it can be dispatched at any time, day or night.
It's a solar plant.
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