TNMP interconnection application

Documents TNMP asks for

• Interconnection application formDG application in PowerClerk with equipment tab (manufacturer, model, quantity, voltages) Gridpol prepares this.
• Single-line diagram (one-line)One-line: service address, ESI ID, TNMP meter number, all equipment labeled, VLLD written out, VLLD-meter distance in feet; 1 page (2 if placards), flattened PDF < 2 MB Gridpol prepares this.
• Site plan / site layoutLayout sketch/site plan: ESI ID, TNMP meter number and location, AC disconnect location, North arrow; Google Earth/bird's-eye OK as PDF Gridpol prepares this.
• Inverter spec sheetSpecification of the proposed inverter
• Customer signatureCustomer email confirmation in PowerClerk + signed Interconnection Agreement
• Interconnection agreementSent by TNMP to customer after review/study
• Other utility-specific documentPlacard proofs (Class 1 within 10 ft; Class 2/3 otherwise); Notice of Installation form and Inspection Form in PowerClerk
• Photos (meter, main panel, equipment)5-photo limit: full PV array (countable), system overview meter-VLLD-panel, meter+VLLD locations if >10 ft, TNMP meter close-up with labels, inverter(s)
• Final inspection sign-off (when applicable)Installer records completion of local city/county inspection if required

How the TNMP process runs

1. Installer submits DG application, site plan, one-line and inverter specification via TNMP DG Portal (PowerClerk).
2. Customer affirms via Customer Confirmation email that installer is authorized and information is correct.
3. TNMP reviews application and performs study.
4. TNMP sends Interconnection Agreement; customer returns it signed.
5. TNMP issues Letter of No Objection approving installation.
6. Installer submits Notice of Installation/Notification of Completion and Inspection Form with photos (and local inspection if required).
7. TNMP may inspect/test (TNMP's option); corrections returned to installer.
8. TNMP installs DG meter ($227 meter change fee) = Permission to Operate; automated email to applicant.
9. TNMP revises load profile (30-45 days after meter); REP handles any buyback.

Fees

Utility fees are paid by the installer or customer; they are not part of the Gridpol plan.

Size levels and limits

No TNMP-specific thresholds found; §25.211 applies (fee-exempt pre-certified ≤500 kW radial meeting 15%/25% screens; DG ≤10 MW <60 kV). Separate transmission interconnection PowerClerk portal for large projects.

Storage, EV and stamps

Common issues the utility lists

• Photos not showing current NEC labeling (dual source, AC disconnect, rapid shutdown, nominal voltage, layout placard)
• Installation not matching one-line/layout sketch (upload corrected drawings)
• AC disconnect without physical handle, not labeled, or not open at inspection
• AC disconnect > 10 ft from meter without site-map placards at disconnect and meter
• Line and load crossed at meter box
• Service entrance inside covered patio/enclosed area
• Meter can/service riser condition (customer responsibility)
• Unsuitable/insufficient photo quality

Gridpol’s pre-submission check covers these before we file.

Sources

• TNMP - Interconnecting: https://www.tnmp.com/customers/interconnecting (retrieved 2026-11-13)
• TNMP DG Permission to Operate Guidelines for Installers: https://www.tnmp.com/sites/default/files/TNMP%20DG%20Permission%20to%20Operate%20Guidelines%20for%20Installers.pdf (retrieved 2026-11-13)
• TNMP Small Commercial and Residential Project Requirements: https://www.tnmp.com/sites/default/files/TNMP%20Small%20Commercial%20and%20Residential%20Project%20Requirements.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)