The London Array wind farm is actually more competitive with nuclear. It did 2500GWh in 2015. which is an average of .285 GW. So a little more than 1/4 of an AP1000. The installed price is stated as $2.5B. So adding a days storage and scaling up to match puts it at $11B. So just 1.5 times the price of nuclear. But a footprint of 500km^2.
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https://en.wikipedia.org/wiki/London_Array
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