Each 2MW windmill costs $3 - $4 million installed! Each gear box costs more than $150,000. There are around 1,200 incidents of gearbox failures reported each year – one failure per 145 turbines. There are 341000 windmills to date and more coming on stream before the end of 2019. In the GE 1.5-megawatt model, the nacelle alone weighs more than 56 tons, the blade assembly weighs more than 36 tons, and the tower itself weighs about 71 tons — a total weight of 164 tons. The gearbox in the largest windmill generator weighs 86 tonnes it is the largest wind turbine gearbox ever built.
Bessler said his wheel would run winter and summer, rain or shine.