http://www.windygrid.org/uncertainty-and-variability-of-electrical-wind-power.htm2011-09-28 http://www.windygrid.org/software/index.php2011-09-28 http://www.windygrid.org/pfc1997.htm2011-09-28 http://www.windygrid.org/software/instructions.txt2011-09-24 http://www.windygrid.org/software/windfreedom_100902_(old).nbp2011-09-24 http://www.windygrid.org/software/windfreedom_100910.nbp2011-09-24 http://www.windygrid.org/instructions.txt2011-09-24 http://www.windygrid.org/windfreedom_100902_(old).nbp2011-09-24 http://www.windygrid.org/windfreedom_100910.nbp2011-09-28