Texas ESI ID Lookup by Address

Find the Texas Electric Service Identifier (ESI ID) for any residential address. Required for solar enrollment, plan switching, Smart Meter Texas data access, and TDU coordination. Returns ESI ID, formatted address, serving utility (Oncor / CenterPoint / AEP / TNMP / LPPL), and a confidence indicator. Backed by Light API's address-search endpoint (private API made public via this tool).

Every Texas residential meter has a 17-22 digit Electric Service Identifier (ESI ID). It's the primary key for everything in the deregulated electric market: enrollment, plan switching, billing, Smart Meter Texas data access, and any TDU coordination.

Customers usually find their ESI ID printed on their electricity bill. Solar installers, energy advisors, and AI agents that don't have a bill in hand need to look it up by address — that's what this tool does.

The lookup is fuzzy: pass a partial address (street + city OR street + ZIP) and the tool returns up to N matches with full address normalization. Each match includes the ESI ID and the serving utility.

PII note: Addresses returned by Light contain real residential service points. The tool returns the data but does NOT log raw addresses or ESI IDs in our application logs (PostHog event captures only the count of matches, not the matches themselves). Agents should treat results as sensitive and confirm with the end user before acting on them.

Why this tool exists: Light API's address-search isn't publicly accessible. Other Texas energy retailers run "ESI ID lookup" SEO landing pages because the demand is so high — this tool is the API equivalent.