"You can pay your TXU Energy bill online, by mail, or in person at a TXU payment location. For more information go on the site itself. As they are the ones that do know."

See the contact information on the TXU website: http://www.txu.com/contact.htm

TXU Electric is located in the State of Texas. The company claims to have a thermostat that can save a home owner $360 over a two year period. There are good and bad reviews of TXU Electric.

Reading some reviews and forum posts, it looks like Reliant has a slightly better reputation than TXU, but TXU looks like a fine choice for an electricity provider.