If it was only a matter of 'once-every-few-years' then current emergency capacity will suffice. The problem is that:

A) It happens often enough to be a problem emergency capacity can't handle.

B) Natural gas is not always an option (especially when Russia is the only readily available seller in the area and you DON'T want to be dependent on a potentially hostile neighbor).

C) Existing storage solutions require a massive investment in local solutions, or in the national grid if storage is centralized.

We need to re-think the entire idea about energy always being cheap and available, while somehow preventing those with more money from simply monopolizing supply by outbidding everyone else. You won't solve that with batteries. Many therefore try to maintain the current situation by doing this the old way.