CAA Habitation recommendedSouth Shore · Master electricians
Commercial electrician on the South Shore
Shop, office or mixed-use building in Longueuil, Brossard or Boucherville: our master electricians are mainly after meter stacks and switchgear.
Quote usually within 7 days
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In short
South Shore businesses and STM-Électrique
On the South Shore, STM-Électrique’s master electricians do the electrical work of shops, offices, warehouses and plants, in Longueuil, Brossard, Boucherville and elsewhere on the South Shore, from the Longueuil agglomeration to the cities of Roussillon, La Vallée-du-Richelieu and Marguerite-D’Youville. For businesses, what we’re mainly after: meter stacks and switchgear. The written quote usually arrives within 7 days, and replacing switchgear or a meter stack is usually done with a shutdown of about 24 hours.
What STM does for South Shore businesses
Adam Chirola, our master electrician, sums up the offer this way: we do everything, but what we’re mainly after is meter stacks and switchgear.
- Meter stack: replacing or expanding it when a commercial or mixed-use building groups several meters.
- Switchgear: the equipment that cuts and distributes the building’s main power.
- Service entrance, when the business needs more capacity.
- Generator: backing up essential equipment.
- Inside the unit: equipment circuits, lighting, workshop sub-panel.
- And also EV chargers, panels, lighting and repairs.
Plants too: 600 V power, machine hookups and planned plant shutdowns are part of our work.
Longueuil, Brossard, Boucherville: where businesses are
Longueuil is the main city of the South Shore, with its boroughs of Le Vieux-Longueuil, Saint-Hubert and Greenfield Park; its agglomeration has 434,711 residents.
In Brossard, the City names three major economic hubs: Mail Champlain, boulevard Taschereau and Quartier DIX30. Three REM stations also serve its territory.
In Boucherville, the industrial park covers nearly 7 km² on both sides of Highway 20; the City counts 664 businesses and more than 24,000 jobs there.
With the southern ring, from Varennes to Châteauguay and as far as Mont-Saint-Hilaire, the near South Shore has 700,904 residents.
The South Shore has no official boundary, by the way: in Greater Montréal, the name refers to the cities south and east of the island, on the south shore of the St. Lawrence, and its limits vary depending on who is talking. An INRS study published in 1998 describes it as four entities: the Longueuil agglomeration and the RCMs of Roussillon, La Vallée-du-Richelieu and Marguerite-D’Youville. In the broad sense, it stretches from Sorel-Tracy to Salaberry-de-Valleyfield and as far as Saint-Hyacinthe, for 970,779 people.
Mixed-use buildings: the meter stack
A building with shops on the ground floor and apartments upstairs can have one meter per unit. The meter stack brings them together, and it’s one of the two jobs Adam Chirola puts forward for businesses.
On the rate side, most businesses fall under Hydro-Québec’s Rate G: it covers business customers whose minimum billing demand stays under 65 kW, about 90% of them.
Above 200 A at 347/600 V, or 320 A at 120/240 V, metering is done through transformers. They sit in a cabinet reserved for Hydro-Québec or in a metal-clad substation: our part is the cabinet and its conduits; the meters and transformers are supplied and hooked up by Hydro-Québec.
To go further: our guide to the commercial meter stack and the one on switchgear.
Keeping the business open: the planned shutdown
In a shop, cutting off switchgear or a meter stack typically takes about 24 hours with us.
The date isn’t chosen alone: only Hydro-Québec can reconnect transformer-rated metering, the electrician doesn’t, so the shutdown day is set with them.
Hydro-Québec’s paperwork is on us: it’s the master electrician who submits the request for service and, once the job is done, its declaration.
And when possible, we split the work into stages so your doors stay open as long as possible.
Generator: what has to keep running
In a shop, an outage means lost merchandise and lost opening hours. What must not stop goes on the generator, such as the walk-in cooler, the alarm or the workstations.
Hooking up the gas falls to a licensed gas company, which we coordinate with; the whole electrical side is ours. See also our page on the generator for a shop or a plant.
EV chargers for your customers or employees
We also install EV chargers for shops, offices and employee parking lots. Before choosing a location, we measure the margin available in the service: if it’s enough, a dedicated circuit brings Level 2 charging; if not, we present the possible solutions to you in black and white.
On the funding side, the Écorecharge program reimburses a business 50% of eligible expenses, including buying and installing the chargers, up to $500,000 per site and per business, capped at twice the charger’s cost for Level 2 (Québec page updated on September 16, 2026); the electrical infrastructure must be installed by an electrical contractor. The details: commercial EV charger installation.
How a commercial project goes on the South Shore
- You receive a free written quote, usually within 7 days.
- The master electrician files the requests with Hydro-Québec; at low voltage, Hydro-Québec supplies either 120/240 V single-phase or 347/600 V three-phase.
- A surprise during the work? We call you before going any further.
- A one-year warranty covers our work, parts and labour.
For a home on the South Shore, or a business elsewhere
We also work for residential customers. For a house, a plex or a condo: electrician on the South Shore (in French), and our pages for Longueuil (in French), Brossard and Boucherville (in French). For a business elsewhere: commercial electrician in Laval, commercial electrician in Montréal, or all our commercial and industrial services.
Commercial electrician on the South Shore: your questions
Do you work in Longueuil, Brossard and Boucherville?
Yes. We do the electrical work of businesses in Longueuil, Brossard and Boucherville, and on the South Shore in general, from the Longueuil agglomeration to the cities of Roussillon, La Vallée-du-Richelieu and Marguerite-D’Youville. Your city isn’t named? Leave your contact details: the team will confirm whether a visit is possible.
How soon will I receive the quote for a commercial project?
Usually within 7 days; it’s in writing and costs you nothing. As for the shutdown, for switchgear or a meter stack, expect close to 24 hours in a business, on a date set with Hydro-Québec if the metering goes through transformers. And if a surprise comes up during the work, we call you before continuing.
Our building has apartments upstairs: who handles the meter stack?
We do. The meter stack is one of the two jobs Adam Chirola, our master electrician, puts forward for businesses, along with switchgear. The master electrician also files the requests with Hydro-Québec. Transformer-rated metering and Hydro-Québec’s role are detailed in our guide to the commercial meter stack.
Do you also work on homes on the South Shore?
Yes. STM-Électrique works for residential and commercial customers. For a house, a plex or a condo on the South Shore, whether it’s a panel, a service entrance, an EV charger or a generator, see our electrician on the South Shore page and our pages for Longueuil, Brossard and Boucherville.
Get a quote: commercial project on the South Shore
Your contact details and a few quick questions. Not sure of an answer? Leave “Not sure” and we’ll check on site.
South Shore
A commercial project on the South Shore?
A free written quote, usually within 7 days.