ERCOT doesn't have equipment. They are a regulatory council.
And while snow happens in TX almost every year, it is most often the wet fat stuff that sticks around for a few days and then melts off. The once-in-a-century event was a solid week of single digit lows, mid-teen highs, and two nights around 0°F.
The Feb 16 high at DFW International was 14. That was two degrees below the previous record low.
There are colder years than others.
Shockingly, those tend to follow the El Nino / La Nina cycles.