Comment by stevenwoo

There is something else going on, Texas home energy usage only accounts for about 1/8 of their total so even eliminating home usage (and commercial, too) would still leave a large difference. Maybe the cheaper gas probably insulates drivers from the costs of poor fuel efficiency and this lets people choose long commutes in spite of the driving time, and the laxer industrial standards encourages a concentration of some processes like the chemical plants in East Texas.