This modular design WES Hybrid (wind-diesel) system provides up to 100% wind power - from nominal wind speed and up - and can be connected to a virtually unlimited number of diesel generators and WES type wind turbines. The 80 kW WES18 Classic and 250 kW WES30 Classic models were in 2005 further optimised by incorporating a power control cabinet that includes an IGBT type frequency converter. This new control system complies with the latest international power quality standards and ensures reliable stable operation even under complex weak grid conditions. The new patent-pending WES Hybrid load management technology continuously adjusts system output to the actual power consumption, and thus eliminates the need for a wasteful ‘traditional’ system dump load.