In the heart of Andalusia the PS10 is the world's first commercial solar tower power plant. The 11 megawatt PS10 solar power plant will generate 24.3 GW/hr per year of clean energy and comprises 624 movable heliostats (mirrors). Each of the mirrors has a surface area of 120 square meters (1292 square feet) which concentrates the Sun's rays to the top of a 115-meter (377 foot) high tower where the solar receiver and a steam turbine are located. The turbine drives a generator, producing electricity. The two axis heliostats move automatically as a function of the solar calendar. This power plant alone will prevent the emission of 18,000 tons of CO2 per year.