[ncmncm]

Such giant storms are rare, and short-lived. A few days' storage outlasts them.

[ascar]

A few days of storage is a lot though isn't it?

[ncmncm]

How much NG do utilities stockpile?

A few days' would be a lot of batteries, but you don't use batteries for that. A few days' pumped hydro, e.g., is not much at all.