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> Offshore wind is pretty constant
Yes, which gives it 40% annual efficiency at best.
Which means a 400 MW off-shore wind farm at best location will on average produce 40% of the energy it would produce if it worked at 400 MW all the time.
Which means to replace one 400 MW non-intermittent plant (coal, gas, nuclear) you need to build 2.5x larger off-shore wind farm.