"There is the potential, we believe, out there, using the resources that there are around the UK to generate maybe all of the electricity that households need ... from offshore wind sources," he said.
http://news.bbc.co.uk/1/hi/uk_politics/7135930.stm

And, that no one can think of any other measure of the success of a windfarm development - like, say, how much thermal capacity will be shut down due to this development.

I fear there will never be any thermal shut down by any or all the wind installations.
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muymalestado