Upgrading the power transmission system between Aqueduc and Saraguay substations

Saraguay substation

The Saraguay transformer substation is the source substation (i.e., the starting point of the line that will be converted).

Located in an industrial area, it was commissioned in 1959 and currently supplies homes, businesses and industrial operations in Pierrefonds-Roxboro, Dollard-des-Ormeaux and Saint‑Laurent.

Line segment between Saraguay and Hampstead substations

Two 120‑kV lines run from Saraguay substation to Laurent substation and then on to Hampstead substation. One of them will be dismantled and rebuilt at 315 kV.

Map showing the line section to be replaced in the Saint‑Laurent borough

• Download the map showing the line section to be replaced in the Saint‑Laurent borough [PDF 6.62 MB — In french only]

Line segment between Saraguay and Hampstead substations

The current line follows a corridor along Chemin Dalton. It will be dismantled and rebuilt in the same location.

Map showing the line section to be replaced in Ville Mont‑Royal

• Download the map showing the line section to be replaced in Ville Mont‑Royal [PDF 3.04 MB — In french only]

Phase 1: Line segment between Saraguay and Hampstead substations

The segment north of Hampstead substation is being studied to optimize the route on Canadian Pacific (CP) property.

Map showing the line section to be replaced in the Côte‑des‑Neiges sector (phase 1)

• Download the map showing the line section to be replaced in the Côte‑des‑Neiges sector (phase 1) [PDF 6.91 MB — In french only]

Phase 2: Line segment between Hampstead and Rockfield substations

Phase 2 covers the segment south of Hampstead substation. An overhead transmission line operated at 120 kV is currently located in the right‑of‑way. It will be dismantled and rebuilt at 315 kV on the same route.

Map showing the line section to be replaced in the Notre‑Dame‑de‑Grâce sector (phase 2)

• Download the map showing the line section to be replaced in the Notre‑Dame‑de‑Grâce sector (phase 2) [PDF 4.34 MB — In french only]

Line segment between Saraguay and Hampstead substations

The proposed optimized line route will run along the periphery of the city of Hampstead. It will cross Canadian Pacific (CP) property over approximately 1 km.

Map showing the line section to be replaced near Hampstead

• Download the map showing the line section to be replaced near Hampstead [PDF 4.14 MB— In french only]

Phase 1: Line segment between Saraguay and Hampstead substations

An overhead transmission line operated at 120 kV is currently located in the right‑of‑way. It will be dismantled and rebuilt at 315 kV. The exact route of this segment in Côte‑Saint‑Luc is being studied in an effort to optimize its path on Canadian Pacific (CP) property.

Phase 1: Hampstead substation

When the reconstruction work is completed, the facilities will be renamed Côte‑Saint‑Luc substation.

Hampstead substation is located in a mixed residential and institutional area, along a railway line. Commissioned in 1955, it supplies homes, businesses and industrial operations in Côte‑Saint‑Luc, Hampstead, Montréal‑Ouest and Côte‑des‑Neiges‑Notre‑Dame‑de‑Grâce.

Hydro‑Québec will build a substation with two buildings that will house almost all the equipment. Landscaping will be carried out at the end of the project.

Phase 2: Line segment between Hampstead and Rockfield substations

Phase 2 covers the segment south of Hampstead substation. An overhead transmission line operated at 120 kV is currently located in the right‑of‑way. It will be dismantled and rebuilt at 315 kV on the same route.

Map showing the line section to be replaced in Côte Saint‑Luc

• Download the map showing the line section to be replaced in Côte‑Saint‑Luc [PDF 8.44 MB — In french only]

Line segment between Hampstead and Rockfield substations

An overhead transmission line operated at 120 kV is currently located in the right‑of‑way. It will be dismantled and rebuilt at 315 kV along a route that is slightly further away from adjacent properties.

Map showing the line section to be replaced in Montréal‑Ouest

• Download the map showing the line section to be replaced in Montréal‑Ouest [PDF 5.69 MB — In french only]

Phase 2: Line segment between Hampstead and Rockfield substations

An overhead transmission line operated at 120 kV is currently located in the right-of-way. It will be dismantled and rebuilt at 315 kV on the same route.

Phase 2: Rockfield substation

Rockfield substation is located in an industrial area. Commissioned in 1947, it supplies homes, businesses and industrial operations in Lachine, LaSalle and Montréal‑Ouest.

The 315‑kV substation will be expanded on the neighbouring property reserved for this purpose, and the control building will have a modern architectural style. The design and colours were approved by the Comité consultatif d’urbanisme (CCU) of Lachine.

Phase 3: Line segment between Rockfield and Aqueduc substations

An overhead transmission line operated at 120 kV is currently located in the right‑of‑way. It will be dismantled and rebuilt at 315 kV on the same route.

Map showing the line section to be replaced in Lachine

• Download the map showing the line section to be replaced in Lachine [PDF 7.79 MB — In french only]

Phase 3: Line segment between Rockfield and Aqueduc substations

An overhead transmission line operated at 120 kV is currently located in the right‑of‑way. It will be dismantled and rebuilt at 315 kV on the same routein the third stage of the project.

Phase 3: Aqueduc substation

The line to be converted to 315 kV ends at Aqueduc substation. Currently operating at 315 kV, the substation will be renovated so the new line can be integrated. The work will include the relocation of the towers outside the substation and of the equipment inside the substation.