The public utility company had proposed to build a new substation, as well as lines with pylons that would tower above the existing ones.
The current Saint-Jean station will be converted from 120 to 315 kilovolts (kV).
The power lines will go along de Salaberry, between Saint-Jean and Sources boulevards.
A new three-km line 315 kV will also be built next to an existing 120 kV line, reaching heights of 52 metres – dwarfing the already existing ones.
WATCH BELOW: DDO power line information session
The West Island of Montreal Chamber of Commerce (WIMCC) welcomed the decision.
“It represents an investment in the economic development of our territory,” said Joseph Huza, president and executive director of the WIMCC, in a press release.
“This project will fill the need for future growth as companies continue to choose the West Island to set up their operations.”
In the past, Hydro-Quebec representatives have insisted the power lines are necessary to meet the West Island’s increasing demand for electricity.
WATCH BELOW: DDO residents oppose Hydro line
Quebec’s environmental board, BAPE, has already approved the project.
The company insists burying the lines would cost far too much and could require more maintenance.
The project is estimated to cost $90 million.