MOUNTAIN VIEW (KPIX) — While wind energy is the fastest-growing energy source in the world, wind farms provide less than five percent of the energy in the U.S. Original article: http://sanfrancisco.cbslocal.com/2017/05/12/small-turbines-from-silicon-valley-firm-may-shift-wind-energy-market/#.WRdAm_hJYdo.twitter