In 2014, Hydro-Québec informed the City of Dollard-des-Ormeaux that it planned to build a new 315-25 kV Saint-Jean substation and install a new 315 kV supply overhead power line of about 3 km. This overhead line will be located in the same hydroelectric corridor as the current 120 kV line. The project aims to ensure the sustainability of the St-Jean substation while meeting the future growth of electrical load in the West Island of Montréal.

This project is necessary because the 120-12 kV substation is now at the end of its service life and Hydro-Québec must meet the growing demand for electricity in the western sector of the Island of Montréal.

Built in 1957, Saint-Jean substation, with a capacity of 120-12 kV, serves approximately 100,000 customers in the municipalities of Dollard-des-Ormeaux, Pointe-Claire, Kirkland, and Beaconsfield.

The project

In 2014, Hydro-Québec informed the City of Dollard-des-Ormeaux that it intends to renovate the St-Jean substation and install a new 315 kV supply line.

Over the years and through several meetings and consultations, the final project is this one:

The plan

To complete a project of this magnitude, Hydro-Québec had to go through several steps.

Click here to see a summary of the file..

  • The public hearing was divided into two parts. The first part, the Commission of Inquiry, held three sessions in Dorval on April 20 and 21, 2016. The sessions in the first part provided a better understanding of the project’s aspects, its context, and its host environment. Hydro-Québec and other resource persons were present to answer questions from the public and from the commission of inquiry.
  • The second part took place in Dollard-des-Ormeaux on May 17, 2016. The purpose of this session was to listen to anyone who had indicated their intention to submit a brief or to make their opinion and suggestions on the project known orally.
  • The panel received 16 briefs, nine of which were presented at the May 17 public meeting.
  • The report was made public on 29 September 2016 (Report 326)
  • All documents for this public consultation can be viewed by clicking on the following link: BAPE hearings
Decree 77-2017 dated February 8 orders that a certificate of authorization be issued to Hydro-Québec with conditions. decree from the Council of Ministers..

Hydro-Québec, the BAPE, and the City also gave residents opportunities to comment on the project. They integrated the residents’ comments as best they could into the project.

Information to residents informing them of the main lines of the project and inviting them to “an information and consultation meeting to be held in the fall of 2014.”
Open house activity at the Civic Centre (December 3, 2014)
Presentation of the solutions selected for the project taking into account, amongst other things, residents’ concerns (April 30, 2015)

Public information session (March 30, 2016)
Public hearings (April 20 and 21, 2016)

Public information evening (October 15, 2018)


For the Saint-Jean Project, Hydro-Québec will build various layouts and landscaping projects.

The pylons for the new 315 kV line will be different from those used for the 120 kV line.

Click to enlarge

As recommended by the Liaison Committee for the 3145 kV line, reduced-width lattice towers will be built. The porosity of the structure reduces the visual range and allows light to pass through. This type of pylon provides visual consistency with 120 kV pylons located in the same right-of-way.

Supply line plan (Click to enlarge)

Type of pylon chosen :

Hydro-Québec plans landscape under the line in the hydroelectric corridor between the des Sources and Saint-Jean substations (approximately 3 km)

St-Jean Station
Corner of Saint-Jean and De Salaberry
Near Centennial Park
Between Tecumseh and Thornhill
des Sources Station


To obtain permission to renovate the Saint-Jean substation and install new pylons on the hydroelectric corridor between Saint-Jean and des Sources, Hydro-Québec took several steps. During that time, the City adopted a resolution concerning the project. Here is the timeline of this project:

December 3, 2014

Hydro-Québec organizes an open house at the Civic Centre to introduce the project to residents.

December 9, 2014

Resolution unanimously adopted by the City of Dollard-des-Ormeaux, citing that it “will accept nothing less than the construction of an underground supply line between the des Sources and Saint-Jean substations “.

October 5, 2015

Hydro-Québec submits an application to the Régie de l’énergie for the construction of the new 315-25-kV Saint-Jean substation and its 315 kV supply line.

January 29, 2016

The Régie de l’énergie authorizes the Saint-Jean project as a whole.

March 30, 2016

A public information session was held by the Bureau d’audiences publiques sur l’environnement (BAPE).

April 20 and 21, 2016

Part 1 of the BAPE public hearings on the Saint-Jean project.

May 17, 2016

Part 2 of the BAPE hearings (submission of briefs).

September 29, 2016

Unveiling of the BAPE Commission of Inquiry report to the public.

February 8, 2017

Decree 77-2017 of the Council of Ministers authorizing the implementation of the Saint-Jean project, with conditions. In its decision, the government requested the creation of a Liaison Committee composed of representatives of Hydro-Québec and the City of Dollard-Des-Ormeaux to improve the project. The committee met about fifteen times. Discussions focused on the configuration of the future substation to maintain a buffer zone between the substation and residents’ properties, the type and number of towers in the right-of-way and their positioning in the line right-of-way, and landscaping in the hydroelectric corridor.

October 15, 2018

Public information evening at the Civic Centre where the Liaison Committee presents the conclusions of its work to citizens.

Spring 2019

Construction work begins on 315-25 kV Saint-Jean substation

December 12, 2019

Construction work of a new 315 kV supply overhead power line

June 2020

End of the 315 kV supply overhead power line works

June to September 2020

Landscaping work under the line in the hydro-electric corridor between des Sources and Saint-Jean substations

September 2020

The new 315 kV supply overhead power line will be in service

Voir plus

Consultation & Committee


Many consultations took place for the Saint-Jean Project.

Open house activity (December 3, 2014)

Public information session (March 30, 2016)
Public hearings (April 20 and 21, 2016)
Second part of public hearings (May 17, 2016)

Public information evening (October 15, 2018)

Liaison committee

Since the start of the the Saint-Jean project, the City of Dollard-des-Ormeaux wished to created a liaison committee to integrate its residents’ requests.

Decree 77-2017 of the Council of Ministers, file in February 2017, established some conditions to which Hydro-Québec must comply, one of which was the creation of this committee.

“Hydro-Québec must set up a liaison committee before work begins. Its role will include collecting and processing complaints from the public, making recommendations for use, including landscaping, and making public the register of noise complaints and the results of follow-up reports. The committee must also provide a communication plan so that citizens can provide feedback, if necessary. […] The committee shall be composed of residents as well as representatives of the City of Dollard-Des-Ormeaux and Hydro-Québec.” – GAZETTE OFFICIELLE DU QUÉBEC, March 1, 2017, 149th year, #9, p.397, translated October 10, 2019.

The Liaison Committee was formed. Its members met 15 times to date. The Committee presented its recommendations during the public information session on October 15, 2018. It continues to meet while the work is in progress.

You can submit your questions to Rousseau.Jean-Philippe@hydro.qc.ca.

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