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I think wind makes more sense at sea than solar. It can operate 24x7 if things stay breezey. In these chosen locations, that is indeed most of the time, and what sets them apart from most land-based locations.

Going to the expense of making a large offshore solar farm which is useless for half the day doesn't seem like as good an investment, even if all the other technical and weather issues were OK.

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There's a page with German electricity production by source [1]. According to that, wind is still more reliable than solar but even offshore wind seems to be far from 24x7. It looks like yesterday there was virtually no wind on the North Sea. It still makes most sense to combine both and then use batteries to match production with demand. Relying on one source won't work.

[1] https://www.energy-charts.de/power.htm?source=solar-wind&wee...

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