Should not be surprising. Griddy specialized in using the spot market pricing. People were flocking to then a few years ago to take advantage of the free power offered by wind generation.
Now, when the spot market pegged at $9000/kWh, they want to complain?
I have long known that the only way to purchase retail electricity is with a term contract. It also helps to shop.
In CA some years ago, there was a desert cold snap down near zero.
Natural gas regulators froze; why check them for water, it never gets cold here.
Gas stopped, pilots went out.
Houses with pipes overhead froze and broke and spewed water. Some folks were gone for Christmas vacation.
PG&E, the gas provider paid for damage as I recall. I was using wood stove and was home so no problem for me, but many bad cases around town.
What is the liability for damages in Texas, I wonder?