Interconnection is the process and agreement through which a utility allows a customer-owned generator, such as rooftop solar or a battery, to connect to its grid. The installer usually submits an application with the system's design, equipment and size, and the utility checks that the local circuit can accept it safely. Larger systems may need a more detailed study and higher fees. The application date can determine which export rate or tariff version you receive, so it matters when rules are changing. After approval and inspection, the utility issues permission to operate. Your interconnection agreement also sets obligations such as keeping the required disconnect switch accessible and notifying the utility before adding batteries.
Related terms and pages
- Permission to operate (PTO): The utility's written approval to switch on a grid-connected solar system.
- Net metering: Billing in which solar power you export offsets power you buy, kWh for kWh, at the retail price.
- Utility rules by state