### Wind | Xcel Energy

As a national leader in wind power for over a decade, more than 20 percent of our energy supply company-wide comes from wind energy — about seven times the wind generation on our system than in 2005. Wind continues to produce more power for our customers. Plans for the nation''s largest multi-state investment in wind energy

### Wind Statistics and the Weibull distribution

15. Wind statistics and the Weibull distribution. This is equivalent to a standard deviation of 52% of the mean wind speed and is taken as the default value in the WindPower program. However, in the program, this ratio can easily be scrolled from 20% to and the effect of this on mean power instantly displayed.