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In page Solar power plants in the Mojave Desert:

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Nevada Solar One uses parabolic troughs as thermal solar concentrators, heating tubes of liquid which act as solar receivers. These solar receivers are specially coated tubes made of glass and steel, and about 19,300 of these four meter long tubes are used in the plant. Nevada Solar One also uses a technology that collects extra heat[citation needed] by putting it into phase-changing molten salts, which enable energy to be drawn at night. Using thermal energy storage systems, solar thermal operating periods can even be extended to meet baseload needs. Solar thermal power plants designed for solar-only generation are well matched to summer noon peak loads in prosperous areas with significant cooling demands, such as the south-western United States.[1][2]