These stats are quite misleading. Solar + storage can deliver cheap energy, but still somewhat intermittently. Usually it would be something like a 10MW solar array paired with 10MWh of batteries. This only gives you 1 extra hour of runtime at 10MW. If you were to match nuclear's 24/7 output you'd need something like 100MWh of storage connected to a 10MW array. This becomes cripplingly expensive.

I'm aware the grid can balance some of this load, perhaps with wind or solar arrays further away. But solar itself has externality costs of intermittency which the grid has to pick up.