Gear Technology and Hydraulics for Wind Turbines Wind energy continues on its road to success by greatly increasing its share in electrical power production on a worldwide basis. The nominal power of wind turbines has risen from 100 kW to 3,000 kW. Now the first 5-MW installations are harvesting power. As producer of hydraulic and gear technology systems Rexroth is a competent partner and comprehensive supplier to manufacturers of wind turbines.