Solar panels provide less than 1.5% of Texas electricity generation, so the fact that they can't be used under snow isn't the cause of the deficiency today.
Texas is pretty large and their solar resources are way the hell out in Pecos County where it hasn't been snowing. This is actual ideal to have your solar power plant far to the west of your population centers, to handle the evening load peak. If Texas had California-scale solar power installations, they would be warm and happy right now.
