I don’t think you want to be prepared for truly out of the ordinary weather. A couple of years ago Tucson had a strong rain couple with a big dip in the temps, left all of our bridges iced up. We only have one de-icing truck to deal with that, some folks complained that we were “unprepared” but it was the first time in Tucson history anything like that had happened. Should the tax payers have been footing the bill for a whole bunch of unused de-icing trucks for all those decades “just in case”? Of course not. Similar with this storm. Their electrical demand nearly doubled, and 10% of their plants were rendered in-operable, I don’t see how anybody is supposed to prepare for that. Should they double the number of plants they have keeping them barely running decade after decade “just in case”? That’s silly.
See#25
"Therefore, this is not a 1 in a 100 years storm but 1 in about 15 years - thus they should plan for it."