Vegetation Control

Why does Hydro-Québec need to control vegetation?

On transmission system lines, the wires are not insulated by a sheath; rather, air acts as the insulator. When vegetation comes into contact with or even comes near the conductors (wires), there is a risk of an electrical arc forming. This phenomenon can cause a power outage or even start a fire; what's more, any person in the vicinity could be electrocuted. Hydro-Québec makes sure that conductors are clear of any vegetation in order to maintain system reliability.

The company's maintenance crews must have quick access to transmission lines without having to deal with any trees or shrubs in their way. Therefore, we clear any vegetation likely to obstruct access to lines or jeopardize the safety of our crews.

And what if there were a forest fire? Maintaining low-growing plants in transmission line rights-of-way prevents fires from spreading, destroying equipment and causing power outages. We protect our facilities and equipment against forest fires in wooded areas.