As far as the UK is concerned, practice appears to be proving them wrong.
Quote:
RenewableUK says a record high of 22% of the UKs electricity was generated by wind on Sunday 17th August,
22% is the highest proportion of the UKs electricity needs ever generated from wind over a 24-hour period (5,797MW average over the 24-hour period on Sunday 17th Aug).
The highest ever average amount of electricity generated from wind over a 24-hour period stands at 7,234MW - a record set on 3rd January 2014.
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RenewableUK | RenewableUK News - New record high: 22% of UK electricity from wind
That's only electricity generation and also the best rather than average 24 hour period but the technology keeps developing and costs keep reducing.