At present, there are at least three major local clusters, all of which are located in special economic development zones in large cities in the north-eastern part of the country: Tianjin, Baoding and Shenyang. Each one houses a mix of domestic and foreign turbine manufacturers, component suppliers and technology services. Tianjin is also home to Winergy Drive Systems (owned by Siemens), a leading supplier of gear units and complete drive systems for wind turbines, located in Beichen Economic Development Area, which is adjacent to the Binhai Hi-Tech Area.