What does the term “utility grid” refer to in the context of Article 690?

The term “utility grid” refers to the local electric supply source that delivers electricity to consumers. In the context of Article 690 of the National Electrical Code (NEC), which addresses solar photovoltaic systems, the utility grid is significant because it represents the electrical network that connects multiple users and generators, allowing for the exchange of electricity. When solar systems are connected to the utility grid, they can either supply excess power back to the grid or draw power from it when needed, facilitating a more flexible and reliable power supply for users.

Considering the other options, an independent energy storage system typically operates separately from the grid, such as batteries that store energy for later use. A renewable energy source could include solar panels, wind turbines, and other technologies, but the term “utility grid” specifically denotes the electrical network rather than energy generation methods. Lastly, an off-grid system functions independently of the utility grid, relying on self-contained energy sources like solar panels and batteries without being connected to the local electric supply. Thus, the definition of “utility grid” in this context is firmly associated with the local electricity supply infrastructure.