ESID Lookup Tool
Search and locate your ESID (also commonly styled as ESI-ID or ESI ID) by address using our free ERCOT ESID lookup tool. Enter the address of your Texas home or business to find your ESID.
What is an ESID (ESI-ID)?
An ESID — also written as ESI-ID, ESI ID, or ESIID — stands for Electric Service Identifier. It is a unique 17-22 digit number assigned by ERCOT (the Electric Reliability Council of Texas) to every electricity meter location in the deregulated Texas electricity market.
Think of it as a permanent address ID for your electrical service. It identifies exactly where electricity is delivered, regardless of which retail electric provider (REP) you choose. Every home, apartment, and business in deregulated Texas has an ESID. This number never changes for your address — even when you switch providers, change your name, or update your account. The ESID stays with the physical location permanently.
When you sign up for electricity service or switch providers in Texas, your new provider uses your ESID to ensure the switch happens at the correct location. Without the right ESID, your switch could be delayed or applied to the wrong address.
Why Do You Need Your ESID Number?
Your ESID is required any time electricity service is set up, changed, or verified at your address. Here are the most common situations where you'll need it:
- Switching electricity providers — Your new REP uses your ESID to process the switch at the correct meter.
- Starting new service — Moving into a new home or opening a business in Texas requires your ESID to activate service.
- Reporting a power outage — Your utility company (TDU) can locate your meter faster with your ESID.
- Verifying your billing — Confirm that your electricity bill matches the correct service address and meter.
- Smart Meter Texas registration — Setting up a Smart Meter Texas account requires your ESID as a security identifier.
What Does the ESID Number Mean?
An ESID is a 17 or 22 digit number. The structure breaks down as follows:
- First 7 digits (TDU prefix) — Identify which Transmission and Distribution Utility delivers electricity to your address. For example, 1008901 = CenterPoint Energy (Houston) and 1017699 = Oncor (Dallas/Fort Worth).
- Remaining digits — Uniquely identify your specific meter location within that utility territory. No two addresses share the same ESID.
The ESID is not the same as your meter number. Your meter number is a serial number printed on the physical device and changes if your meter is replaced. Your ESID is tied to the address, not the hardware, and stays the same permanently. The ESID also does not appear on your physical meter — you'll find it on your electricity bill or by using our free ERCOT ESID lookup tool above.
ESID Prefix by Utility (TDU)
The first 7 digits of your ESID identify which utility delivers electricity to your address. All Texas ESIDs are assigned through ERCOT and begin with "10".
Texas ESID Prefix Map by County
Hover over any county to see which utility (TDU) serves it and its ESID prefix
Utility Territories
Frequently Asked Questions
Common questions about ESI-IDs answered
What is an ESI-ID and why do I need it?
An ESI-ID (Electric Service Identifier) is a unique 17-22 digit number that identifies your specific electricity meter location in Texas. You need it when switching electricity providers or starting new service — it ensures your switch is processed for the correct address.
Where can I find my ESI-ID number?
You can find your ESI-ID in several places: on your electricity bill (look for a 17-22 digit number starting with 10), using our free lookup tool above by entering your address, or by contacting your utility company directly.
Is an ESI-ID the same as a meter number?
No, they are different. An ESI-ID identifies your service location (address), while a meter number identifies the physical meter device. If your meter is replaced, you get a new meter number, but your ESI-ID stays the same.
What do the numbers in my ESI-ID mean?
The first 7 digits identify which utility (TDU) serves your area: 1008901 = CenterPoint (Houston), 1017699 = Oncor (Dallas/Fort Worth), 1003278 = AEP Texas Central (South Texas), 1020404 = AEP Texas North (West Texas), 1040051 = TNMP, 1011292 = Lubbock Power & Light, 1013830 = Nueces Electric Coop. The remaining digits are unique to your meter location.
Does my ESI-ID change when I move?
No, your ESI-ID does not follow you when you move. Each address has its own permanent ESI-ID. When you move to a new address in Texas, you will need to look up the ESI-ID for your new location.
The ESID lookup didn't find my address. What should I do?
If the lookup returns no results, your address may be new construction. New meters must be assigned an ESID by the local utility company after the builder requests a meter set. The ESID typically appears in the ERCOT database within 24 hours of activation. Your address may also be in a non-deregulated area of Texas.