Home › Utilities › Texas › Oncor
Investor-owned utilityOncor interconnection application
Oncor is an investor-owned utility serving 3,545,814 residential customers in Texas (EIA-861, 2025). Applications: Third-party portal (Oncor installer portal (eTRACK / DERTRACK, hosted by anbetrack)). Gridpol files Oncor interconnection applications for licensed installers – solar, storage and EV chargers – with single-line diagram and site plan, unlimited for $500 a month.
Get started Look up another ZIP
Process verified from Oncor’s official sources (see below). Portal, documents, steps and fees confirmed from Oncor pages/tariff. Portal is hosted on anbetrack.com but linked from Oncor's official installer page. Contact dg@oncor.com, 1-866-728-3674. PUCT rule text read from LII reprint (puc.texas.gov blocked); check whether PUCT has amended §25.211/25.212 since 2017.
Oncor at a glance
Oncor Electric Delivery Company LLC (Sempra (majority owner))
TypeInvestor-owned utility
EIA utility ID44372
Residential customers3,545,814 (EIA-861, 2025)
Net-metered residential customersnone reported
Service territory99 counties in Texas
How to applyThird-party portal – Oncor installer portal (eTRACK / DERTRACK, hosted by anbetrack) · official link
Who submitsInstaller registers on the installer portal and submits on the customer's behalf; installer sends the customer the tariff application for signature. Tariff Application and Interconnection Agreement must be signed by the customer. If DG owner/end-use customer is not an individual (small commercial), a Signature Authorization Letter (company, signer name, title, signature) must be uploaded. Application includes an Authorized Release of Information list (project manager, electrical contractor, consultant).
Review time (official)Oncor: installation time frame 'a few days to several months'; surplus data to REP within 30-60 days (first full billing cycle) after PTO/meter set. 16 TAC §25.211(m): interconnection within 4 weeks of receipt of a completed application for pre-certified equipment, 6 weeks for other facilities (longer if substantial capital upgrades). §25.211(g)/(i): pre-interconnection studies max 4 weeks.
Documents Oncor asks for
- Interconnection application formTariff application (Oncor Tariff for Retail Delivery Service, 6.3 Agreements and Forms), entered in portal with equipment tab (manufacturer, model, quantity, voltage of panels, inverters, batteries, generator) Gridpol prepares this.
- Customer signatureCustomer signs tariff application and Interconnection Agreement
- Site plan / site layoutLayout Sketch: 1 page (2 if placards), bird's-eye view, service address, ESI ID (or 7-digit premise no.), North arrow, street name, driveway, all equipment labeled, utility meter, VLLD and distance VLLD-meter in feet; flattened PDF < 2 MB Gridpol prepares this.
- Single-line diagram (one-line)One-line diagram: 1 page, service address, ESI ID, order of equipment connections, all existing equipment, separate VLLD between customer equipment and Oncor meter; ATS mode (open/closed transition) if generator; flattened PDF < 2 MB; no markups of example drawings Gridpol prepares this.
- PV module spec sheet (when applicable)Equipment data entered in portal equipment tab; must match drawings exactly
- Inverter spec sheet (when applicable)Equipment tab; UL 1741 certified = pre-certified system
- Battery spec sheet (when applicable)Batteries/ESS listed with manufacturer, model, quantity, voltage
- Other utility-specific documentPlacard proofs (Class 1 if VLLD within 10 ft of meter; Class 2/3 otherwise) uploaded separately in Placards section per Oncor Placard Guideline
- Photos (meter, main panel, equipment)Min. 5 inspection photos at 'Agreement Available' step: street view with house number, equipment nameplates (site-specific, no stock), exterior wall showing equipment/meter/main panel, installed equipment, all VLLDs and placards
- Letter of authorization / designated agent form (when applicable)Signature Authorization Letter when owner/customer is not an individual
- Interconnection agreementPrepared by Oncor after review/study; signed by all parties
How the Oncor process runs
- Customer selects an installer.
- Installer sends the customer the tariff application for signature.
- Installer submits the project via the web-based installer portal (layout sketch, one-line, equipment tab, placard proofs).
- Oncor reviews application and documentation, performs a study, prepares the Interconnection Agreement.
- Interconnection Agreement signed by all parties; inspection photos uploaded at 'Agreement Available' step.
- Oncor issues Permission To Operate (PTO) letter to customer and installer.
- Oncor programs the advanced meter to measure surplus (out-flow) kWh.
- Surplus generation data provided to the customer's REP within 30-60 days of PTO; customer arranges buyback with REP.
Fees
| Fee | Applies to | Note |
|---|---|---|
| $0 | Pre-interconnection study, 0-10 kW pre-certified, not on network (exporting or non-exporting) | Tariff DD36, effective June 1, 2026 |
| $166.20 | 0-10 kW: not pre-certified, or on network | DD36; * no cost for inverter systems < 20 kW on network |
| $341.70 | 10+ to 500 kW (all categories) | DD36; ** no cost for pre-certified, not on network if generator supplies < 15% of feeder load and < 25% of feeder fault current (per §25.211(g)(1)) |
| $4,566.70-$10,605.15 | > 500 kW | DD36 tiers 500-2000 kW and 2000+ kW |
| As calculated | DD37 Distributed Renewable Generation Metering (on request per §25.213(b)) | Installed within 30 days of request |
Utility fees are paid by the installer or customer; they are not part of the Gridpol plan.
Size levels and limits
| Level | Up to | Note |
|---|---|---|
| Residential / small commercial (inverter and small systems) via installer portal | No kW cap stated on page | |
| Fee-exempt pre-certified (§25.211(g)(1)) | 500 kW | Pre-certified, radial, export ≤15% feeder load and ≤25% short-circuit contribution |
| Energy system developers (large DG) | 10000 kW | DER < 10 MW and < 60 kV per Oncor page; separate application + study fee |
16 TAC §25.211 covers on-site DG ≤10 MW at <60 kV.
Storage, EV and stamps
Battery storage
Batteries/energy storage are listed DG equipment; must be shown on layout sketch and one-line (manufacturer, model, qty, voltage). Oncor provides example one-lines for solar+micro-inverter+battery, solar+ESS and battery-only. Single VLLD between Oncor meter and ALL DG sources. No meter collars (meter socket reserved for Oncor, ESG 500.06). Identical-equipment replacement needs no change; non-identical equipment voids the IA (new project).
Common issues the utility lists
- Markups or copies of Oncor example drawings
- Drawings not matching installed system or portal equipment tab
- Missing ESI ID / service address / North arrow on drawings
- 'Visible Lockable Labeled Disconnect' not written out; VLLD distance to meter missing
- Molded-case breaker used as VLLD; VLLD not accessible/exterior
- Meter collars in meter socket
- Placard proofs missing or buried in design packet
- Stock or reused equipment photos
- Duplicate hold: premise already has a project (requires email on add/replace or customer's written installer preference)
- Missing Signature Authorization Letter for non-individual owners
Gridpol’s pre-submission check covers these before we file.
Sources
- Oncor - Renewables, Solar and More: https://www.oncor.com/content/oncorwww/us/en/home/smart-energy/renewables-solar-and-more.html (retrieved 2026-11-13)
- Oncor - For Installers: https://www.oncor.com/content/oncorwww/us/en/home/smart-energy/renewables-solar-and-more/for-installers.html (retrieved 2026-11-13)
- Oncor - Thinking About Solar? (interconnection process): https://www.oncor.com/content/oncorwww/us/en/home/smart-energy/renewables-solar-and-more/residential-small-commercial-thinking-about-solar.html (retrieved 2026-11-13)
- Oncor Residential/Small Commercial Project Requirements (rev. May 1, 2025): https://www.oncor.com/content/dam/oncorwww/documents/for-installers/New-Residential-Requirements-2025.pdf.coredownload.pdf (retrieved 2026-11-13)
- Oncor Placard Guideline: https://www.oncor.com/content/dam/oncorwww/documents/for-installers/Placard%20Guideline.pdf (retrieved 2026-11-13)
- Oncor Tariff for Retail Delivery Service (6.1.2.4 DD36 eff. June 1, 2026): https://www.oncor.com/content/dam/oncorwww/documents/about-us/regulatory/tariff-and-rate-schedules/Tariff%20for%20Retail%20Delivery%20Service.pdf.coredownload.pdf (retrieved 2026-11-13)
- 16 TAC §25.211 Interconnection of On-Site Distributed Generation (LII reprint of Texas Administrative Code; PUCT site puc.texas.gov returns HTTP 403 to this server): https://www.law.cornell.edu/regulations/texas/16-Tex-Admin-Code-SS-25-211 (retrieved 2026-11-13)
$500 / month
Unlimited interconnection applications. 12-month agreement, signed online. The agreement starts the day you sign; first invoice right away, then monthly.
- Unlimited interconnection applications
- Single-line diagram and site plan for every application
- Pre-submission check against the utility’s requirements
- Homeowner e-signature link for the authorization
- Filing in your utility portal accounts or by the utility’s method
- Utility questions, corrections and resubmissions
- Follow-up through approval, inspection and PTO
- Customer list, exports, API and webhooks
Applications are typically submitted within 2 business days after complete documents. Utility review times are set by each utility.