The other component of the power outages is that - get this - wind turbines can freeze up. Doesn't matter if the wind is blowing if the turbines can't move. Same with solar. If it's cloudy and covered with snow, those panels don't work.
The central part of the state is very reliant on renewable power coming from the west. If there is no power from the west, the resources in the east have to work that much harder to power East Texas AND Central Texas and there might not be enough to go around. Joe Bastardi was saying in an update last night that it could be like a "statewide hurricane" with all the power outages everywhere.
I happen to live pretty near (< 10 miles) the Parish power plant south of Houston, which runs on coal. We probably won't lose power unless some lines fall or something. But the further you are from a reliable fossil generating station, the more likely you are to possibly have issues. It's the same reason Henry Hub NG is trading ~$6 this morning but it's over $100 in the upper plains. The few wells they have up there are all frozen up and there's not enough capacity (or transmission) down here to get more up to them.