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The problem with wind and solar is not only that they are variable (so require a centralised buffering) but also they have extremely low surface power density.
Because you only get from 2 W/m2 (wind) to 7 W/m2 (PV), you need really vast area to be able to produce reasonable amount of energy. To put that into scale, a 400 MW off-shore wind farm occupies 70 km2 while a 2000 MW nuclear of gas plant maybe 1 km2.