Connecting to our grid

Our electrical grid is a network that delivers electricity from our generating stations to homes and businesses. If you have a generator, or plan to install a generator, and are interested in selling us your excess electricity, contact us to discuss your plans.

We will determine if your interconnection is feasible and how it may affect our grid. If it is approved, then we will outline any work to be done and any costs.

Your project is called non-utility generation (NUG) and your generator is a non-utility generator.

Standby generation

Standby generation creates electricity as a backup for your own use. There are 2 types of standby generation: open transition switching; and, momentary closed transition switching.

Read more about standby electric generators.

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.

You do not require our approval to connect this generator, but you must:

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

Interconnection requirements

For all other non-utility generator interconnections, you must have our approval, and:

Technical requirement resources for interconnection to our electrical system:

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 DRIP approval of your momentary closed transition switching, you must:

  • meet all interconnection requirements;
  • use a CSA-approved closed-transition transfer switch;
  • provide the transfer switch’s data sheets (that specify <100 milliseconds parallel overlap);
  • be responsible for potential engineering review costs.

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Parallel generation

Parallel generation receives electricity from your generator and our grid at the same time. There are 3 types of parallel non-utility generation: load displacement only interconnection; load displacement plus excess to grid interconnection; and, independent power producer of 10 MW or less (AC).

Load displacement only interconnection

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

For DRIP approval of your load displacement only interconnection, you must:

  • meet all interconnection requirements;
  • use a CSA-approved closed-transition transfer switch;
  • install a reverse power relay to prevent power flow back into our grid;
  • be responsible for potential engineering review costs.

Load displacement plus excess to grid interconnection

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 (which we determine) and size of your existing facility electrical service.

For DRIP approval of your load displacement plus excess to grid interconnection, you must:

  • meet all interconnection requirements;
  • enter into an Engineering Study Agreement (PDF, 203 KB) (for larger, complex interconnections);
  • use a CSA-approved closed-transition transfer switch, or approved grid-tie inverters for PV solar installations;
  • pay for a bi-directional meter and any upgrades required for our grid to allow the interconnection.

If an Engineering Study Agreement is required, a deposit (determined by Manitoba Hydro) must be placed, and you will be responsible for all actual engineering costs incurred. You may need to retain a consultant. If the study identifies potential impacts to our grid, you may be required to apply through our Open Access Interconnection Tariff.

An Interconnection and Operating Agreement (PDF, 389 KB) may be required for operating, procuring, installing, and paying for upgrades.

Independent power producer of 10 MW or less (AC)

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

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.

The DRIP approval for this type of non-utility generation interconnection is extensive. For project approval, you must:

The Engineering Study Agreement will require a deposit (determined by Manitoba Hydro) and you will be responsible for all actual engineering costs incurred. You may need to retain a consultant. If the study identifies potential impacts to our grid, you may be required to apply through our Open Access Interconnection Tariff.

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Generation greater than 10 MW AC

For proposed non-utility generation greater than 10 MW (AC), or a 25 kV or more connection to our grid, you may be required to apply for interconnection through our Open Access Interconnection Tariff. Contact an Energy Services Advisor to discuss this type of interconnection project.

Learn more about selling electricity to Manitoba Hydro.

Contact us

For more information about non-utility generation interconnections, email our Energy Services Advisors.

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