Judith-Jasmin substation

Video: Judith-Jasmin substation in Terrebonne

Welcome to the jobsite!

There aren’t many people who can say they’ve toured a transmission substation construction site.

Project manager Martin Lavoie takes us to Judith-Jasmin substation currently being built in Terrebonne.

The substation will meet electricity needs on three levels: local, regional and provincial.

At present, the project involves some 200 workers. Earlier stages from design through approvals involved the input of close to 1,000.

In April 2016, Hydro-Québec began construction of Judith-Jasmin substation in Terrebonne. This 735/120/25-kV substation is located north of the 640-Côté-Est industrial park. The year 2017 is when work on the substation was at its most intense, with more than 200 workers on site. The substation will be able to transform more than 2,300 MW, enough to power about 800,000 homes.

Read the Project News bulletin to see the substation map and consult the project schedule (in French only) [pdf — 2,63 Mb]

This new substation has two objectives:

  • Meet the growing demand for electricity on the north shore, including the regional county municipality of Des Moulins. In the Mascouche and Terrebonne areas, the demand for electricity is experiencing strong growth, due in large part to the Urbanova major residential development and the new Mascouche commuter rail line.
  • Connect the new line from Chamouchouane substation in the Lac-Saint-Jean region.

To supply electricity to the surrounding areas, Hydro-Québec will build a network of underground conduits some 24 km long, which will include crossing under Highway 640.

An optimal solution for the Terrebonne area

The new substation will reduce the number of lines in the existing right-of-way leading to Duvernay substation in Laval, thereby minimizing the impact on the woods surrounding the TransTerrebonne bicycle path. In addition, by combining the infrastructure north of Highway 640, Hydro-Québec will not have to build a substation near residential areas.

Underground infrastructure work in Terrebonne

To deliver electricity to the surrounding area, Hydro-Québec will build a 24-km-long network of underground conduits, including three crossings under highway 640. Civil engineering work for the distribution lines in the area around Boulevard des Seigneurs, south of highway 640, began in fall 2017 and will continue until December 1, 2017. Local residents can consult the map for details about work that is under way.

Project in images

The following slide show contains images from: Judith-Jasmin substation

  • November 2017 – Delivery of a single-phase 735-kV shunt reactor. This piece of equipment stabilizes the voltage in the substation.
  • November 2017 – Deicing of the concrete base of a shunt reactor prior to its installation.
  • November 2017 – Installation of a shunt reactor on its concrete base in the oil containment basin.
  • November 2017 – Installation of equipment for the 735-kV section of the substation.
  • November 2017 – Installation of equipment for the 735-kV section of the substation.
  • November 2017 – View of the 735-kV section of the substation, including towers and support systems for electrical equipment, such as current transformers, insulators, etc.
  • November 2017 – Thermite welding for the grounding of electrical equipment. Grounding ensures the safety of workers and equipment, particularly in case of short circuit.
  • July 2017 – At the heart of the jobsite: In the distance are substation buildings. In the foreground foundations are being laid and the drainage system is being installed.
  • July 2017 – 735/120-kV control building.
  • July 2017 – Installation of equipment support structures and busbar assemblies.
  • July 2017 – Preparation of the base for a foundation. Next step: installation of formwork.
  • July 2017 – Framework for foundation pads. Next step: placing reinforcing steel.
  • July 2017 – Aerial view of foundations for some of the substation equipment.
  • July 2017 – Visual simulation of Judith-Jasmin substation
  • May 19, 2016 – Preparing the ground and overview of the new substation’s site.
  • May 19, 2016 – Preparing the ground and overview of the new substation’s site.
  • July 2017 – Aerial view.