Wind Falls

Moreover, this estimate is undoubtedly too optimistic. Wind frequently does not blow when we need it. For example, as the BBC reported, the cold weather on Dec. 21, 2010, was typical of a prolonged cold front, with high-pressure areas and little wind. Whereas wind power, on average, supplies 5 percent of the UK?s electricity, its share fell to just 0.04 percent that day. With demand understandably peaking, other sources, such as coal and gas, had to fill the gap.

Source: http://feeds.slate.com/click.phdo?i=91f0fc080b9a339a050bea7283fda536

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