In a traditional coal-fired power plant, coal that has been pulverized into a fine dust is burned to heat water until it becomes steam. The steam then turns the blades of a large turbine, which turns the generator and produces electricity. But if the fresh water is heated before it enters the boiler, less coal is needed in order to make the steam -- and that is the principal behind Xcel Energy's brand new solar-coal hybrid power plant in western Colorado.
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