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The Gemasolar Station, a solar power station in Fuentes De Andalucia, Spain, is able to generate electricity all day and night.  Thank to it's special energy storage system, it produce electricity during cloudy days and even during the night when the sun is not shining.
 
The Gemasolar station is located in the plains of Andalusia.  It consists of a central tower that is illuminated likea powerful beacon by 2,600 solar mirrors, each 120 square metres, arranged in a giant 195-hectare circle.  The mirrors reflect the suns rays on to the tower, transmitting energy with an intensity 1,000 times higher than that of the sun's rays reaching the earth.  This energy is stored by heating a huge vat filled with salt.  The heat is so intense that the salt is reduced to a molten state.  The temperature of the molten salts is more than 500 degrees C.  The molten salts are used to heat water to produce steam to drive the turbines which will produce electricity.  With the ability to store energy, the Gemasolar station produces 60 percent more energy than a solar power station without storage capacity. It can generate energy 6,400 hours a year as compared to 1,200-2,000 hours for other more conventional solar power stations.