As per the record, at the end of 2009 worldwide wind energy generating capacity was 159.2 GW and Energy production was
340 TWh, which is about 2% of worldwide electricity usage. It is growing rapidly, having doubled since 2006 [1]. In present time, global wind power potential is of the order of13,000 GW. It is about 6% of the global installed power generating capacity. But the higher target is to achieve 12% of the world’s electricity from wind power by 2020 [1]. The average
annual growth rate of wind turbine installation has been around 30% during last 10 years.