Until it's winter, the ground is frozen, and they have no reserves to burn. Then there's a panic to get the same nonrenewables they would normally flare off when the weather is sunny and breezy.
> That's why Texas has so much renewable power.
It has tons of underdeveloped land in a region with good wind and favorable sunlight. That's it.
Texas, like Germany's lignite (shit coal) renaissance, is a terrible example of good energy policy. Keep in mind Texas is also on its own grid and struggles to pay people to burn the excess energy they can't use since they also can't easily send it outside their grid and have almost no means to store the excess.