This is a misleading article quoting the wholesale market rates that are normally paid by factories, utility providers, etc. The vast majority of Texans pay a set rate every month to their utility provider, who ideally generates enough to cover demand, but has to buy from the wholesale market if they fall short (or can sell back to the wholesale market if they over-produce).
There’s a small number of people who pay wholesale rates for their residential service, but many of them learned their lesson after that big freeze a few years back. Generally that kind of plan is geared to people who have their own generator, solar, etc and only buy from the grid in rare situations.