Look, this is super misleading information and I keep seeing it repeated. They're first in the nation in total electricity generation from renewable sources, but that's mainly because of how big they are. If you look at what percentage of their consumption is from renewable sources, they're not even in the top ten.
The reason Texas is #1 in renewables is actually Rick Perry, bless his heart. He pushed for a massive expansion of wind generation capacity back in the early 00s and was instrumental in building high voltage transmission lines between west Texas wind and the more eastern population centers. He would be drummed out of today's Republican party
Which is why he became Secretary of Energy under Trump. Also I think he was kicked off Dancing with the Stars in one of the early rounds. Certainly makes him qualified to occupy the same chair as Steven Chu.