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Vestas Wind Systems A/S is a Danish manufacturer of wind turbines to produce electric energy. It is considered one of the world's leading companies within its field. Measured on the number of units put installed, Vestas is the world's largest producer. In 2010, Vestas had installed more than 41,000 wind turbines in 65 countries across 5 continents. In 2011, all Vestas wind turbines combined produced enough electricity for 21 million people.