Note, TX electricity is "deregulated" and the deregulation attempt learned a lot from the follies of CA's approach. They took the single company (TXU, so not really privatized per se) and broke it into the actual ones managing the infrastructure (e.g. Oncor) and limited TXUs ability to change pricing during an incubation period while other private companies sprang up.

So now TX electrical companies are just a bunch of middle men. They only compete on price and customer service, and price IIUC is basically a margin game of futures and size, not actual electricity innovation. By law, only one company can setup the lines, fix the lines, etc. Not sure how privatized that is if it's the state by another name.

I'd say the privatization or lack of between TX and CA has little to do with costs or quality. In this case, CA just had a bad company and TX a better one (or ones).