Study area

Before determining the line routes and location of the substation, Hydro-Québec surveyed a study area of some 40 km2 to better understand the host environment.

Map of the study area for the Patriotes project [PDF — 327 Ko]

Consult the project map to see the location of the planned substation and line routes on Google Earth.

Biophysical and human environment

The biophysical and human environment map below shows the elements that could be impacted by the project.

Biophysical and human environment map for Patriotes project (in French only) [PDF — 3.3  Mb]

Project components

Hydro-Québec plans to build the new Patriotes substation in Saint-Eustache’s industrial sector. In the first phase, the substation will include three high-to-medium-voltage transformers (315/25 kV) in order to meet customers’ needs. Another transformer may eventually be added to respond to changes to development in the regional county municipality of Deux-Montagnes.

Visual simulation of the proposed Patriotes substation

A new 315-Kv supply line will connect the planned substation to the existing 315-kV line located north of Boulevard Arthur-Sauvé. The new support structures will be four-legged lattice towers or reduced-footprint lattice towers, which reduce the line’s impact on farmland.

Examples of four-legged and reduced-footprint lattice towers

Hydro-Québec then set out line routes and locations for the substations based on the following criteria.

Substation and line

  • Avoid the most environmentally sensitive areas: the built environment and residential developments, sugar bushes, land reserved for horticulture and specialized crops, wetlands and erosion zones.


  • Build the substation as close to the load centre as possible.
  • Avoid protected agricultural land.


  • Trace routes that do not require the relocation of homes or important farm buildings.
  • Determine the shortest possible route to reduce construction costs and the number of elements and spaces that may be affected by the project.
  • Limit landscape impacts.
  • Respect property and lot boundaries whenever possible.
  • Limit the number of landowners affected by the project.

Proposed substation sites and line routes

Map of the proposed substation sites and line routes for the Patriotes project

Proposed substation sites

Two sites are currently under study for the transformer substation. Site 1 is located north of the Agence métropolitaine de transport (AMT) railway. The site would be accessed via the Boulevard Industriel.

Site 2 is located south of the AMT railway. The site would be accessed via the Boulevard Albert-Mondou.

Proposed line routes

Route A

Route A is 4.7 km in length. It is the shortest route and affects fewer landowners than route B. However, where the route crosses Chemin de la Rivière Nord, there is a small shed that must be relocated.

Route B

Route B is 5.5 km in length. It crosses a sugar bush over 600 m, a wetland over 200 m and land reserved for specialized crops over nearly 200 m.

Routes A and B cross roads near homes, especially at Chemin de la Rivière Nord.

Both routes mainly cross farm land with open views. However, the woodlots and vegetation along the roads would partially hide the towers.

Next steps

At the conclusion of the study and consultation process, Hydro-Québec will submit an environmental impact statement to the Ministère du Développement durable, de l’Environnement et de la Lutte contre les changements climatiques du Québec to obtain the required permits.