Bonus (now Siemens) was a leading manufacturer of wind turbines, and in 2004 it was acquired by Siemens. With Bonus’ expertise in turbine manufacturing and Siemens’ expertise in project management, it reinforced the company's position as one of the main players in the industry.  Some of Bonus' wind turbine models include: B120, B95, B150, B250, B300, B450, B500, B600, B1000, B1300, B2000, B2300, among others.