The PS10 Solar Power Plant (Spanish: Planta Solar 10), is a solar mirror farm. It is the world’s first commercial concentrating solar power tower operating near Seville, in Andalusia, Spain. The 11 megawatt (MW) solar power tower produces electricity with 624 large movable mirrors called heliostats.^[2] It took four years to build and so far cost €35 million (US$46 million).^[3] PS10 produces about 23,400 megawatt-hours (MW·h) per year, for which it receives €271 (US$360) per MW·h under its power purchase agreement; equating to a revenue of €6.3 million per year.^[4]