Union de Producteurs de Saint-Émilion is a cooperative wine group in Bordeaux producing a range of red wines. These are based mainly on the Merlot grape, which is sourced from 750 hectares (1850 acres) of Saint-Émilion and Saint-Émilion Grand Cru vineyards. The cooperative was founded in 1931 during a period of economic depression. The main instigator was Robert Villepigue, who had managed Château Figeac from 1905-1928, and who later owned Château Cadet Piola. To begin with, there were just six member estates but today there are nearer 170, and the Union is responsible for around 12 percent of all production from Saint-Émilion. In 2003, Union de Producteurs constructed a new gravity-flow cellar, featuring 141 stainless steel vats. It is the largest facility of its type in Europe, and also has hi-tech optical sorting equipment, eight large vertical presses and a cellar housing 5000 barrels. Union de Producteurs has an extensive portfolio of brands and separately vinified château wines, including châteaux Le Loup, Viramiere and Galius. The company's annual production reaches 4,600,000 bottles.