Houston and surrounding areas

• CenterPoint Energy
  (713) 207-2222, or toll free (800) 332-7143

• Texas New Mexico Power
  (888) 866-7456 

Dallas/Ft Worth and surrounding areas

• Oncor Electric Delivery (formerly TXU)
  (888) 313-4747

• Texas New Mexico Power
  (888) 866-7456

South Texas

• AEP
  (866) 223-8508

West Texas

• AEP
  (866) 223-8508
  

• Oncor Electric Delivery (formerly TXU)
  (888) 313-4747

• Texas New Mexico Power
  (888) 866-7456

Sharyland 

• Sharyland Utilities
  (956) 668-9551