Connecting to our grid

Our electrical grid is a network that delivers electricity from our generating stations to homes and businesses. If you are interested in selling us your excess electricity, we will determine if the connection is realistic, and how it could affect our grid.

One of our Energy Service Advisors will review your interconnection.

We will purchase your excess electricity (produced at 200 kW or less) for $0.03949/kWh between April 1, 2019 to March 31, 2020. The price of excess electricity is reviewed annually.

Types of non-utility generation

There are 2 types of non-utility generation – standby and parallel.

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. Your generator does not need interconnection approval.

You must:

  • have a Canadian Standards Association (CSA) approved open-transition transfer switch;
  • have your generator inspected by our electrical inspectors.

DR interconnection requirements for Types I to IV

You must:

Type I: momentary closed transition switching

To help monthly load testing of backup generation without outages to your service, your electricity output is parallel with our grid for 100 milliseconds or less before contact is broken. Your generation source will then power your facility.

For interconnection approval you must:

  • meet all requirements listed above;
  • use a CSA-approved closed-transition transfer switch;
  • provide the transfer switch’s data sheets, that specify <100 milliseconds parallel overlap.

Read more about standby electric generators.

Type II: load displacement only

This system can parallel indefinitely and is used for load displacement. It meets some of your electricity needs and reduces your energy bill while we provide the rest of your electricity requirements.

For interconnection approval you must:

  • meet all requirements listed above;
  • use a CSA-approved closed-transition transfer switch;
  • install a reverse power relay to prevent power flow back onto the grid.

Type III: load displacement plus excess to grid

This system can parallel indefinitely and allows excess electricity that you generate to flow into our grid. Power flow is limited by the local hosting capacity and size of your existing facility electrical service.

For interconnection approval you must:

  • meet all requirements listed above;
  • may require an Engineering Study (PDF, 147 KB) which may require a consultant;
  • use a CSA-approved closed-transition transfer switch;
  • pay for a bi-directional meter and any utility service upgrades.

Type IV: independent power producer

This type of generation produces electricity only to sell it to us, and can be very costly to install and maintain. We will determine allowable hosting capacity at the proposed installation site.

Hosting capacity can be affected by:

  • system fault levels;
  • conductor ampacity limits;
  • protection schemes;
  • feeder loading.

Interconnection approval is extensive; you must:

Generation greater than 10 MW alternating current

For generation greater than 10 MW (AC), or a 25 kV or more connection to our grid, discuss your interconnection project with an Energy Services Advisor. Read about our Open Access Interconnection Tariff.

Contact us

For more information about non-utility generation interconnection, email an Energy Services Advisor.