Petrobras has announced that the Potiguar, Cabugi, Juruti and Mangue Seco wind power plants, which make up the Mangue Seco Wind Farm, are now commercially operating in Rio Grande do Norte, Northeastern Brazil. With a total investment of BRL 424 million, Petrobras’ first Wind Power Plant began commercial operations eight months earlier than the Company had agreed on with Aneel (the Brazilian Power Regulator). The 20 year power sale agreements were contracted during the first wind power auction, held in December 2009. The 2009 auction predicted that the energy generated by the plants would be supplied to the National Interconnected System from 1 July 2012, but Petrobras advanced the schedule and the entire plant was in commercial operation as of 1 November 2011, after the last plant, Juriti, went online. The plants are fitted with 52 2-megawatt (MW) aerogenerators each; the Mangue Seco Wind Power Part has the largest installed capacity in Brazil operating with this type of aerogenerator (104MW). Each aerogenerator is composed of a concrete and steel tower measuring 108m in height and three sets of 42m long fiberglass blades, weighing a total of around 300tons. Each unit’s transmission system is equipped with an internal 34.5kV distribution network, a 34.5/138-kV transformer substation, and a 138-kV transmission line. The Cabugi plant was built in partnership with Eletrobrás; Mangue Seco with Alubar Energia; and the Potiguar and Juruti plants in partnership with Wobben WindPower.