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Request a connection

You need your facilities connected to the Hydro-Québec power system.

Connection involves running a line from the power grid to your electrical system. The connection point marks where Hydro-Québec’s responsibility ends and yours begins.

Connection is always done by Hydro-Québec, and must be requested by a master electrician.

Service charges apply, depending on the scope of the work required.


Procedure for requesting connection

Business Customers −

Step 1

Authorize your master electrician to submit a connection request to Hydro-Québec.

Business Customers −

Step 1

Prepare for connection to the power grid by asking a master electrician or a consulting engineer to

  • compile a list of your electrical devices (lighting, heating, ventilation, air conditioning, motors, etc.) and estimate the maximum power demand by adding up the power requirements of all devices used simultaneously;
  • ensure that your electrical system meets the standards of the Canadian Standards Association (CSA), manufacturers’ recommendations and Hydro-Québec’s standards and regulations.

Step 2

Authorize your master electrician to submit a connection request to Hydro-Québec.

Connection fees

Energization $361
Service call without energization $172
Disconnection charge
At delivery point $50
Elsewhere $361

If connecting your electrical installation entails extending or modifying the distribution system,

Service charges may change subject to approval by the Régie de l’énergie.

Here are the steps to follow for connecting to Hydro-Québec’s .

You should allow 6 to 18 months for a connection, depending on the complexity of the project.

The first stage in the process is requesting electrical service.

Ask a master electrician or consulting engineer to prepare the facilities to be connected to the grid, as follows:

  • Perform an inventory of your electrical equipment (lighting, heating, ventilation, air-conditioning, etc.) and estimate the maximum power demand by adding up the power draws of all systems and equipment to be used simultaneously
  • Certify your facility’s compliance with Canadian Standards Association (CSA) standards, manufacturer’s recommendations and Hydro-Québec standards and regulations

To open a file, we must receive an official application using the Régie du bâtiment du Québec form from a master electrician (member of the Corporation des Maîtres électriciens du Québec) or a consulting engineer on your behalf.

During this stage, Hydro-Québec assigns a technician who will oversee the project until the connection has been completed.

You must provide the following in writing:

  • Single-line diagram
  • Layout plan
  • Description of loads to be connected:
    • Under the Conditions of Electricity Service, three-phase medium-voltage electricity is supplied at a maximum of 260 A, which is equivalent to 5.6 MVA at 12 kV, 11.2 MVA at 25 kV and 15.5 MVA at 34 kV.
    • If the planned maximum amperage is greater than 260 A, Hydro-Québec must conduct a special study to determine the voltage level and mode of supply.
    • Single-phase medium-voltage power is supplied by means of an overhead line at a maximum of 50 A.
  • Any other technical information requested by the technician.

Based on that information, Hydro-Québec will provide you with the following:

  • Supply scenario
  • Preliminary cost estimate (to within 30%)

The draft-design stage starts when you accept the preliminary cost estimate. The technician will be able to give you details about the work to be done and the time it will take.

You must provide the following in writing:

  1. Your acceptance of the preliminary cost estimate
  2. An undertaking to repay costs incurred by Hydro-Québec if you abandon the project
  3. Technical data and engineering plans requested by the technician or metering inspector

For connections at 260 A or over, you must sign a draft-design agreement and provide a financial guarantee covering the amounts incurred by Hydro-Québec during the draft-design stage.

During this stage, the contribution agreement is signed, the connection work is done and your electrical installation is energized.

This agreement includes an adjustment charge, which means that you pay the difference between the power you have agreed to consume and your actual power demand over a five-year period.

For connections at 260 A or over, you must give us a financial guarantee covering the total amount of the allowance paid by Hydro-Québec. You must agree to consume a certain amount of power over a given period, at the end of which, if you have met your commitment, your financial guarantee will be returned.

Note: Hydro-Québec cannot begin work until the contribution agreement has been signed, the requested contribution has been paid, the financial guarantees have been provided and the necessary environmental authorization certificates have been obtained. The costs are adjusted to reflect actual costs once the work has been completed.

Business customers −

If your company is a data centre or has a power demand of 5,000 kW or more, please contact us at ConnectionLP@hydro.qc.ca. We’ll be happy to provide you with rapid answers to your questions.

Note that there are different connection procedures depending on whether you require supply at medium voltage or high voltage.

Here are the steps to follow for connecting to Hydro-Québec’s .

Here are the steps to follow for connecting to Hydro-Québec’s .

Hydro-Québec performs an exploratory study to determine the best option for supplying electricity to the site.

To request a study, write to Hydro-Québec, providing the following information:

  • Planned site
  • Anticipated power demand, based on 10-year operations forecasts
  • Type of facility and process
  • Disturbance-producing equipment and sensitive equipment that will be used
  • Anticipated number of years of operation, in the case of mining companies
  • Any specific needs
  • Desired time frame

Hydro-Québec will then provide you with the following:

  • Possible supply scenario for the site
  • Very general estimate of costs (to within 50%)
  • Availability of grid to handle anticipated loads
  • Typical timeframe

Estimated duration of this stage: Hydro-Québec does its best to provide this information within six weeks of receiving your written request.

Hydro-Québec performs a planning study to determine the best connection scenario.

In this step, we determine the optimal supply solution for all your loads, estimate the costs of the draft design and project, and draw up the completion schedules and technical requirements.

Send Hydro-Québec a written request including the following for the selected site:

Hydro-Québec will then provide you with a summary of the planning study results, including the following:

  • Baseline solution for the connection and options
  • Estimated costs of the draft design and project (to within 30%)
  • Completion schedule
  • Preliminary draft-design agreement

Estimated duration of this stage: Hydro-Québec does its best to provide this information within six months of receiving your written request.

Hydro-Québec starts the draft design once you have decided to go ahead with your project. In this stage, technical aspects are detailed, a more precise timeframe and schedule are established and project costs are firmed up (to within 10%).

The environmental studies required to obtain government approvals are conducted at this time.

Send Hydro-Québec a written request along with Appendix A, Part 2, of the Technical Requirements for Customer Facilities connected to the Hydro-Québec Transmission System, duly completed.

You must also sign the draft-design agreement and provide financial guarantees to cover the cost of the draft design.

During this stage, you must carry out the studies required by Hydro-Québec to demonstrate that the technical specifications are met and provide any additional information requested, all within the agreed-upon time frame. The studies must be approved by Hydro-Québec.

At the end of this stage, Hydro-Québec will provide you with the following:

  • Summary of work to be done to connect your facilities
  • Any special requirements
  • Project cost (to within 10%)
  • Draft contribution agreement

Estimated duration of this stage: Hydro-Québec does its best to provide this information within 15 months of receiving your written request, including all the documents listed above, along with the financial guarantees required for the draft design.

Note: During this stage, you and Hydro-Québec sign a draft-design agreement to make sure that the actual cost of the draft design will be covered if you postpone or abandon the project. Hydro-Québec cannot begin the draft-design phase until you have signed the agreement and provided the financial guarantees.

Hydro-Québec starts the work and energizes your electrical installation once you have signed the contribution agreement, put up the financial guarantees and paid your contribution in full.

While the project is being carried out, you must provide any information requested, perform any technical testing required and comply with any special requirements.

You must also agree to consume a certain amount of power over a given period, at the end of which, if you have met this commitment, your financial guarantee will be returned.

When the work is nearing completion, Hydro-Québec will give you an operating agreement to sign.

Estimated duration of this stage: one to five years

Note: Hydro-Québec cannot begin work until the contribution agreement has been signed, the requested contribution has been paid, the financial guarantees have been provided and the necessary environmental authorization certificates have been obtained. The costs and the required financial contribution will be adjusted to reflect the actual costs once the work has been completed.