best defined how? Solar & wind might not be better than coal in a climate change scenario with frequent high energy storms.
By high energy storms do you mean CME's? If anything it would be smart to also spend on preventing that problem at the same time. Faraday cages in transformers and such.
Ah, yes. Each place has advantages for different power. Nuclear is the best for a strong backbone for the grid. Batteries make the grid more stable though.