Souligny substation and supply line
- Region
- Montréal
- Status
- Under study
- Type
- Transport
- Expected completion
- 2031
Construction and connection of a 315/25‑kilovolt (kV) substation in Montréal's east end to replace the 120/12‑kV Longue‑Pointe substation, which will be dismantled.
Project description
Upgrading the power system in Montréal’s east end
To meet electricity needs in the Mercier–Hochelaga‑Maisonneuve and Anjou boroughs, Hydro‑Québec plans to build a new 315/25‑kV substation and supply line that will be connected to an existing line.
The project is part of the plan to develop the transmission system on the island of Montréal, which aims, among other objectives, to ensure system reliability and improve service quality.
The planned substation and supply line will replace the existing 120/12‑kV Longue‑Pointe substation, which will be dismantled. Once the new equipment is operational, the load will be gradually transferred to the new substation to maintain uninterrupted service.
Did you know?
Longue‑Pointe substation was commissioned in 1957, nearly 70 years ago. After decades of exposure to the elements, the substation and its equipment have reached the end of their service life and must be replaced to continue to supply approximately 30,000 customers.
Studies and consultations
In the coming months, an analysis of the proposed site and consultations with stakeholders will guide the development of a project with the least environmental, social and economic impacts.
Study area and proposed site
Hydro‑Québec has identified the area where it will determine the location of the substation and line route with the least impact. It considers the natural and human environments that could be affected and the technical requirements to build a substation and line in an urban area. To minimize the project's footprint, the study area is located near the existing Longue‑Pointe substation and 315‑kV line.
Hydro‑Québec carefully assessed several potential sites within this area. After analyzing the options and consulting with community representatives, the site selected to build the substation is the Primo International lot at 7000, rue Hochelaga. Because the property is largely developed, it limits the necessary transformation of natural spaces and meets the technical requirements for construction. Hydro‑Québec is purchasing the land in order to pursue its environmental assessment and public consultation.
The line route that will connect the substation to the existing 315‑kV line on Rue Trianon has not yet been determined.
– in French only]
Map of the study area
The area is located between Rue Notre‑Dame, Rue Sherbrooke, Avenue Haig and Autoroute 25.
– in French only]Work schedule
-
2025–2027
Draft design phase (technical studies, environmental assessment and public consultation)
-
2027–2028
Government approvals
-
2028–2031
Construction
-
2031
Commissioning of the new substation
-
2036
Dismantling of the former Longue‑Pointe substation
Public participation
We are here for you
We want to carry out a project that respects the host environment. To achieve this, your involvement is essential to reduce its impact. By participating, you help us better understand the area and optimize the project so our equipment fits seamlessly into its surroundings.
Thank you for taking part in our first information session, which took place on March 19, 2026.
Additional information and consultation sessions will be organized in the coming weeks.
Substations: Essential hubs
What’s an electrical substation and how does it work?
Explore an electrical substation. See the vital role it plays in transmitting and distributing power from the generating station to the home.
Running time: 5 minutes [in French only]
Integrated Enhancement Program
Powering communities
Hydro‑Québec believes that its power transmission facilities (lines and substations) should blend harmoniously into their environment. Through its Integrated Enhancement Program (IEP), Hydro‑Québec grants eligible organizations funding to enable them to carry out initiatives in which local residents have had a say.
For over 30 years, the IEP has helped develop, maintain, repair and enhance communities. Thanks to this program, more people are playing, skating, cycling, reading, laughing, and gathering across Québec. See for yourself!
Frequently asked questions
Find answers to questions about the project and our environmental approach.
The existing 120/12‑kV Longue‑Pointe substation will soon reach the end of its service life. It must be rebuilt to enhance service quality for approximately 30,000 customers and improve the power system's reliability and resilience in response to the increasingly intense weather events brought about by climate change.
The 120/12‑kV Longue‑Pointe substation, which is nearly 70 years old, has reached its technical limits and its equipment is at the end of its service life. It must be replaced to maintain system reliability.
To ensure continuous service, the load transfer between the former and new substations must be gradual. This is why the new substation cannot be built on the current site while Longue‑Pointe substation remains in operation.
The future Souligny and Hochelaga substations are two separate, albeit complementary, projects in the Mercier‑Hochelaga-Maisonneuve borough. Once completed, each substation will supply the customers in its respective service area.
Construction of Hochelaga substation and its supply lines will begin in March 2026. For more information on the Hochelaga substation and underground transmission lines project, go to the project website : https://www.hydroquebec.com/power-generation-grid/construction/projects/hochelaga-substation/
The new substation will connect to the existing 315‑kV line. The final line route has not been decided yet. It will be determined based on the results of the project studies.
Once the new substation is commissioned and the load transfer is complete, the facilities of the 120/12‑kV substation will be dismantled and the site will be rehabilitated in accordance with current standards. For the time being, Hydro‑Québec plans to retain the land for its operations.
The substation will be built to minimize disruptions for the neighbourhood.
In the coming months, we will be working on several aspects: choosing the exact location, integrating the facilities architecturally and planning the landscaping.
Additional measures may be proposed based on the needs expressed at the consultations.
Hydro‑Québec will work with communities to identify the most effective ways to minimize the project's impact. The environmental assessment and public consultation process will help us understand local concerns and needs and propose appropriate mitigation measures to develop the best possible project.
We will also provide updates throughout the key phases of the project to keep you informed.
Let’s stay in touch
We're committed to keeping the lines of communication open. Please send us your questions and comments about the project.
Info‑Project Line: 1 866 388‑1978
NewsletterSouligny substation and supply line
Follow the project’s milestones and progress