The Specator February article seriously doubts the claims around wind energy - and concludes "At bottom, wind is still a medieval technology".
The summary states - "Perhaps the best that can be hoped for, then, is that wind can provide the spinning reserve required for all grids. It is not surprising to find countries like Denmark and Germany topping out at 20 percent. That is the point where spinning reserve ends and base-load responsibilities begin."
And even then - vaguries of wind patterns are at odds with demand - such as during peak hot summer days - when very little wind is available.
For more in-depth issues and analysis - including environmental concerns and impacts - see the article.