"From our long-term database of multiple global models, we have observed periods of over - or underperformance that can last for several years and, in some cases, as long as a decade."
A January 2015 wind resource map from Vaisala confirms the lack of wind at the beginning of the year. The map confirms that that wind speeds were off 20% from their normal January averages. And within some western U.S. locations, Vaisala confirms that wind resources may be off as much as 45% from their long-term January averages. To view the map, click here.
http://www.vaisala.com/Vaisala%20Docume ... _final.jpg
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