www.generalplastics.com kinetic energy in the wind to rotational energy transmitted through the drivetrain to the generator. Generated electricity can be connected directly to the load or feed to the utility grid [4]. The weight and cost of the turbine is the key to making wind energy competitive with other power sources, because research programs have significantly improved the efficiency of the rotor and maximized the energy capture of the machine. The real opportunity today is through better, low cost materials and though high volume production, while ensuring the reliability is maintained. The typical weight and cost of the primary turbine components today are shown in Table 1. In addition there are foundations and conventional ground-mounted systems, including transformers, switching and other power equipment. There appear to be several areas where technological progress and cost reduction are needed. Turbine subsystem costs are generally evenly split between rotor, nacelle, drivetrain power systems, and the tower. There is no single component that dominates turbine cost. The rotor is the highest cost item on most machines and must be the most reliable. Towers are normally the heaviest component and could benefit from weight reduction, but lightening the rotor or tower-top weight has a multiplier effect throughout the system including the foundation. Expected Technology Evolution The components of turbines are changing as the technology improves and evolves. There is a trend toward lighter weight systems. Light weight, low cost materials are especially important in blades and towers for several reasons. First the weight of the blades and rotor is multiplied through out the machine.