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Concentrating solar thermal power plants Concentrating solar thermal power (CSP) plants are a promising option for power generation in regions with high direct solar irradiation. The principle seems to be very simple: Large mirrors are used, to concentrate rays of sunlight on an absorber tube to evaporate water. Inside the absorber tubes, steam is produced directly through phase change. The generated vapour streams through the turbine to power its blades which produces electricity in the generator (see figure below). S un lig h