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==Claim that technically close to (ie 94% say) 100% wind power is feasible in the UK==
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1. If the entire UK national grid annual demand (which is very well defined [[Control of the National Grid (UK)]]and therefore a good example, but could be any other large grid where the facts are known) were supplied by wind power - typically 140 GW, 35,000 turbines, would be needed in the UK. Then self evidently, when the wind is not blowing, all the existing power stations can be started up in sequence to fill in the gaps. The cost of providing this cover is very roughly the Spark Spread and not overwhelmingly significant - about £7.MWh compared to supply prices presently of £70/MWh.
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