The problem with wind energy is<br>If the m/s is too low they dont work eg usually at night as the day breeze dissipates <br>If the m/s is too high they go into prop feather mode  <br>So the window of opportunity is narrow <br>Ans in summer when you get a long period of good high pressure weather then they are of no use at all,(reply>), <i>"So the window of opportunity is narrow "</i> No. It is not. I bet you have never looked up the working wind speeds for wind turbines.<br><i>"Ans in summer when you get a long period of good high pressure weather then they are of no use at all"</i> That'S why you don't build them where this can happen. (also during such a period solar cells produce more tan enough power)