It's not reasonable to expect households to monitor their electricity rates or alert emails that closely nor be prepared to drop everything to switch providers at a moment's notice for an entirely unexpected reason. I know I don't immediately read every email I get.
An even if someone was monitoring that closely, or was ready to jump, there's no guarantee they'll be able to switch:
https://6abc.com/griddy-gridy-texas-power-bills-what-is-ener...:
> In a rare move Sunday night, Griddy sent out an email to all 29,000 of its customers, urging them to switch to a different provider. Thigpen says she tried Monday morning, but no one was taking new customers....
> We reached out to a few providers here in Texas. They are not taking customers. Some say they may accept new customers by next Wednesday, when they say the weather has improved. That was the earliest 'maybe' answer we could get.