Vestas Wind Systems A/S is a Danish manufacturer, seller, installer, and servicer of wind turbines. It was founded in 1945, and as of 2013, it is the largest wind turbine company in the world. Vestas Wind Systems A/S develops, manufactures, sells, and services wind turbines worldwide. The company operates in two segments, Project and Service. The Project segment sells wind power plants, wind turbines, etc. The Service segment engages in the sale of service contracts, spare parts, and related activities.