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Interconnection with Oncor

  • Your installer files the application in Oncor's portal. Oncor reviews it, performs a study and prepares an interconnection agreement, then issues permission to operate (PTO). Surplus generation data reaches your retail electric provider within 30 to 60 days of PTO. Source: https://www.oncor.com/content/oncorwww/us/en/home/smart-energy/renewables-solar-and-more/residential-small-commercial-thinking-about-solar.html (accessed 2026-10-20)
  • Oncor requires a visible, lockable, labeled AC disconnect between the meter and all distributed generation equipment. Source: https://www.oncor.com/content/dam/oncorwww/documents/for-installers/New-Residential-Requirements-2025.pdf.coredownload.pdf (accessed 2026-10-20)
  • Buyback depends on your retail electric plan. Source: PUCT, https://www.puc.texas.gov/consumer-help/electricity/solar/Default.aspx (accessed 2026-10-20)

A note on the federal tax credit

The federal residential clean energy credit (25D) doesn't apply to expenditures made after December 31, 2025. The IRS treats an expenditure as made when installation is completed. Source: https://www.irs.gov/newsroom/faqs-for-modification-of-sections-25c-25d-25e-30c-30d-45l-45w-and-179d-under-public-law-119-21-139-stat-72-july-4-2025-commonly-known-as-the-one-big-beautiful-bill-obbb (accessed 2026-10-20). This page isn't tax advice.

Questions to ask

  1. Which Oncor net metering or export rule will my system be on, and what is the current credit rate?
  2. How did you size the system against my last 12 months of usage, and what export share did you assume?
  3. Who files the interconnection application, and how long does permission to operate usually take here?
  4. What's included in the price (permits, inspections, monitoring), and what warranties cover panels, inverter and workmanship?

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