British Windfarms Work at 21% Efficency

British Wind Farms consistently fail to deliver quoted levels of output

A report from a British Conservation charity, The John Muir Trust has shown that our heavily subsidised wind farms operate at 21% efficency not the 29 – 30% efficency claimed by the Green evangelists.

1. ‘Wind turbines will generate on average 30% of their rated capacity over a year’
In fact, the average output from wind was 27.18% of metered capacity in 2009, 21.14% in 2010, and 24.08% between November 2008 and December 2010 inclusive.

2. ‘The wind is always blowing somewhere’
On 124 separate occasions from November 2008 to December 2010, the total generation from the windfarms metered by National Grid was less than 20MW (a fraction of the 450MW expected from a capacity in excess of 1600 MW). These periods of low wind lasted an average of 4.5 hours.

3. ‘Periods of widespread low wind are infrequent.’
Actually, low wind occurred every six days throughout the 26-month study period. The report finds that the average frequency and duration of a low wind event of 20MW or less between November 2008 and December 2010 was once every 6.38 days for a period of 4.93 hours.

4. ‘The probability of very low wind output coinciding with peak electricity demand is slight.’
At each of the four highest peak demand points of 2010, wind output was extremely low at 4.72%, 5.51%, 2.59% and 2.51% of capacity at peak demand.

5. ‘Pumped storage hydro can fill the generation gap during prolonged low wind periods.’
The entire pumped storage hydro capacity in the UK can provide up to 2788MW for only 5 hours then it drops to 1060MW, and finally runs out of water after 22 hours.

About Tory Aardvark

Climate Realist, Conservative and proud NRA member. I don't buy into the Man Made Global Warming Scam, science is never settled. http://toryaardvark.com @ToryAardvark on Twitter ToryAardvark on Facebook

Posted on April 7, 2011, in Anthropogenic Global Warming, Cancun COP16, Church Of Climatology, Climategate, COP16, Green Jobs Lie, Green Lies, Oh FFS, Renewables, Wind Power and tagged , , , , . Bookmark the permalink. 3 Comments.

  1. Amazing it’s even as high as the claimed 21%

    IPCC = insincere politicians confiscating cash

  1. Pingback: Climate Change – Belief Is A Regional Thing « Tory Aardvark

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