The percent increase in energy production with corresponding increase in hub-height for wind energy
conversion system (WECS) from different manufacturers was compared in this study. It was seen that an
increase of 10m in hub-height from 40 to 50m resulted in an increase of 3.17% in energy production for
wind turbines from Nordex, while a change of 3.48% from Vestas, and so on. The overall mean increase
in energy production was found to be 2.92% while changing the hub-height from 40 to 50 m. Further
increase of 10m in hub-height from 50 to 60 m, showed an increase of 7.55%, 7.90%, 7.88%, 8.25%, 8.14%
and 7.75% for WECS from Nordex, Vestas, DeWind, GE, Bonus and Enercon respectively. The overall mean
increase in energy production was found to be 7.91% for this change of hub-height from 50 to 60 m.
Similarly, an increase of 3.02% in energy production was obtained for an additional of 10m increase in
hub-height i.e. from 70 to 80 m. On the average the maximum increase in energy production of 7.91%
was obtained while changing hub-height from 50 to 60 m.