That website shows California as currently worse. It looks like Larger states just have more power outages, which is to be expected. Texas also is a weird state that is very large it gets Tornadoes, extreme heat, and hurricanes, while also having several very large metro areas in it. There also isn't anything indicated differences in grid monitoring, are all grids (like large rural grids) monitored to the same levels?
California has power outages as a matter of routine in some places. When I went there the rural areas were constantly experiencing load-shedding power outages and some of the rural lodging advertised that they had backup generators because this is so routine there.
90% of the Texas grid is independent from the rest of the country
We also have a lot more growth in the past few years than most other places, both in relative terms, and in absolute (big state + high growth introduces more absolute friction than small state). Demand is forecast to rise over 20% from 2024 levels vs. an American average under 5%: https://www.eia.gov/todayinenergy/images/2025.07.31/main.svg
We have high power demand in both winter and summer: in the latter, air conditioners use a lot; in the former, about half of Texans heat with electricity because we have less cold and so less usage of cost-effective, grid-preserving furnaces.
Texas has been building a ton of wind and solar to supplement generation capacity and is taking some leadership in the next-gen nuclear stuff for a reliable base load, but in the mean time the shortage of CCGTs is going to bite in a state where demand goes up this much, this fast. SB6 passed this summer also should help with reasonable control and oversight.