How do I know if I have CoServ or Oncor?
How do I know if I have CoServ or Oncor? In our area, it should be either Oncor or CoServ. The easiest way to determine your TDU is to look at your electric statement and see who it says to contact in case of emergency or outage (your TDU maintains the lines and actually provides the electricity). If it says to call CoServ, you’re done.