Siemens Gamesa Renewable Energy, S.A. was formed in 2017 in a merger of Siemens' Wind Power division with Gamesa Corporación Tecnológica, S.A.; it is a Spanish-German wind engineering company based in Zamudio, Biscay, Spain. The company has two other main sites in Spain: one in Madrid and the other in Sarriguren. Other than its headquarters, its onshore business is primarily based in Spain, while the offshore business is based in Germany and Denmark. It is the world's second largest wind turbine manufacturer behind Vestas.