> the overall monetary costs
But it's false, just look at LCOE (levelized cost of energy) for UK. First, it's cheaper than off-shore farms, second, it's not "far bigger" than on-shore wind farms or solar. Third, and most importantly, you physically cannot cover 5'000 km2 in UK or Germany with solar panels or wind farms and equivalent nuclear power plant will occupy <1 km2 at worst.