Connecting to our grid
Our electrical grid is a network that delivers electricity from our generating stations to homes and businesses.
We will determine if your interconnection is feasible and how it may affect our grid. If your interconnection request is approved, we will outline any work to be done and any costs.
Customer-owned generation interconnections
There are 3 classifications of interconnection to our system:
- interconnection for generation 10 MW (AC) or less;
- interconnection for generation greater than 10 MW (AC);
- standby generation (no excess energy purchase agreement required).
Before the installation of a new service can be approved, you must:
- Submit a signed Excess Energy Purchase Agreement (PDF, 476 KB) (if applicable) and an Interconnection Request (PDF, 175 KB) to both Independent Power and Energy Services Advisors.
- Apply for an electrical permit and any other applicable permits and licenses.
- Submit a commercial service request to install a bi-directional meter (if applicable) for all customer types including residential.
Our interconnection guidelines outline additional requirements of each interconnection type.
Generation 10 MW (AC) or less
There are 3 interconnection types for customer-owned generation 10 MW (AC) or less:
- Load displacement only
Any electricity your system generates will reduce the amount of energy you need to buy at that time. If you use more energy than your system generates, you will purchase that energy from us at the current electricity rate, just like you did before you installed your system.
- Load displacement plus excess to grid
Similar to load displacement only, you can reduce the volume of energy you purchase by using your own generation. When your system generates more energy than you use, you can sell the excess generation back to us. This type of interconnection is typically used for residential and small commercial solar installations.
- Independent power with full generation to grid
This type of interconnection is typically used for larger independent power projects with intent to sell their full generation to the grid rather than displace load. This interconnection type may be limited by the available hosting capacity on our system. Hosting capacity is the amount of electricity generated at your site without causing unacceptable reliability or voltage quality for you or other local customers. Hosting capacity can also be affected by system fault levels, conductor ampacity limits, protection schemes, and feeder loading.
Generation greater than 10 MW (AC)
Standby generation creates electricity as a backup for your own use. There are 2 types of standby generation:
- Open transition switching
A manual or automatic transfer switch breaks the connection from our grid before connecting the generation output to your residence or business.
- Momentary closed transition switching
To assist monthly load testing of backup generation without outages to your service, your electricity output is in parallel with our grid for 100 milliseconds or less before contact is broken. Your generator then powers your facility.
For more information about non-utility generation interconnections, email our Energy Services Advisors.