There are 39 data points in the marked area of the graph: 39 days when there was low wind farm output in both SA and NSW. (ramblingsdc.net)
Forecasts of wind farm output are increasingly accurate, and drops in output can be predicted and compensated for using conventional power stations. (newscientist.com)
Last time Stuart Young completed research on wind farm output an independent analysis showed serious discrepancies. (environmentalresearchweb.org)