Where a Home Battery Can Go in Ontario, and Who Installs Them in the GTA

Most of the battery companies in this index are solar installers, with a few other trades among them. Google gives each business a one-line label on Google Maps. It calls 11 of the 16 records a solar energy company, and it labels INTOCHARGE an electrician.

The label hints at how a first conversation may go. A company labelled as an electrician may start with your electrical panel. A solar company may start with how the battery pairs with an array, new or existing.

Solar X's three records are in downtown Toronto, Vaughan and Oshawa. Three companies list a third kind of work beside panels and batteries. Ontario Solar Installers in Vaughan adds off-grid solar. Green Integrations Inc. in North York and CarbonFree Technology Inc. at Yonge and St. Clair add commercial solar. Green Integrations' own website is written for businesses, so ask whether it takes home jobs.

A company lands in the site's solar battery storage category when battery terms appear in its name, its Google description or its own website text, and the site has corrected a few of those by hand against the company's own site. Electricians who fit batteries without saying so will not appear.

Only two, INTOCHARGE and Kwh Vault Battery Storage, are filed here under battery storage without panel installation. INTOCHARGE, on Bay Street in the Financial District, has its own website describing battery backup work, including Tesla Powerwall systems, alongside EV chargers and solar. So the filing is narrower than what the company says it does.

Kwh Vault Battery Storage, in Pickering, carries Google's energy equipment label. The site's own link check found that its web address does not resolve, so its profile shows no website. Confirm it is still trading before you book a visit.

These are the two listed companies to ask about a battery for a house with no solar, or one added to an array another company installed. The solar companies may take that job as well, so ask each one whether it does battery-only work.

The battery companies are spread across the GTA, with small groups in Toronto and Vaughan. By the address on each record:

• City of Toronto: 5 (Solar X's downtown record, INTOCHARGE, PCON, Green Integrations Inc. and CarbonFree Technology Inc.)
• Vaughan: 3 (Solar X's Vaughan record, Ontario Solar Installers in Maple and The North Solar in Concord)
• Mississauga: 2 (Zeno Renewables and Solario)
• Richmond Hill, Burlington, Pickering and Oshawa: 1 each (Vivion Energy, Rechargeables Inc., Kwh Vault Battery Storage and Solar X's Oshawa record)
• Bolton: 1 (Heliotechnik Inc. Solar)
• No address on record: 1 (Xolar)

The site files Heliotechnik, whose address is in Bolton, on its Brampton page. The Vaughan and Mississauga pages show all five of their battery records beside the rest of their local market. The Toronto page shows INTOCHARGE, PCON and Green Integrations; Solar X's downtown record and CarbonFree Technology are filed under Toronto neighbourhoods and are reached through their own profiles.

A recorded address is where a company sits, not how far it travels. A Vaughan installer may well quote in Etobicoke. Ask about travel, and about who will come back for service calls. A battery is equipment you may need someone to return for.

If you hire someone to connect a battery to your house, the ESA says the law requires a Licensed Electrical Contractor, because that connection is electrical work whoever sells the battery. The ESA says "The Ontario Electrical Safety Code (the Code) requires almost all electrical work be reported to the Electrical Safety Authority by filing a notification of work". It adds that "The person doing the work (you or a Licensed Electrical Contractor) should file the notification before the work starts."

A battery company may hold the licence itself or bring in an electrical contractor. Either can work, but you should know which one you are buying and whose name goes on the notification. The ESA's advice when hiring is short: "Ask for their ECRA/ESA licence number." ECRA is the Electrical Contractor Registration Agency. The ESA says to check the number on its Find a Contractor tool.

The index does not check licences. Its crawler, reading company websites in August 2026, found an ECRA/ESA licence number printed on the sites of 2 of the 14 battery businesses, Solar X and INTOCHARGE. That is what those sites say about themselves; run any number through the ESA tool yourself. The guide to who does the electrical work on a solar install covers the panel and meter side.

In Ontario, a home battery can go in one of four places under the Electrical Safety Authority's Bulletin 64-8-4, issued October 2026. They are an attached garage, a detached garage or other free-standing structure, the outside wall of the building, or a dedicated room or utility room. That room needs a door with a self-closing device and, at minimum, a ceiling finished in gypsum board, walls finished in gypsum board with the joints sealed, and a floor finished with lumber sheathing; more fire-resistant materials, such as a concrete floor, also qualify.

The same bulletin sets limits that shape a quote:

• no battery in a sleeping area, or in a room that opens directly into one
• a smoke alarm or detector in the room when the battery is inside the home
• batteries at least 1 m from any window or door, other than a vehicle door
• no single energy storage system over 20 kWh, unless the ESA accepts a larger unit under the bulletin's conditions, among them that its maker rates it for that capacity, that it is installed to the maker's instructions and that it is permanently labelled with the number of an ANSI/CAN/UL 9540A test report showing it met at least the unit-level criteria
• up to 80 kWh in all for the home, in an attached garage or on an outside wall, but no more than 20 kWh for one system, or 40 kWh for several, in a dedicated room

In a building with several homes, such as a condo, a battery in a dedicated room or utility room needs that room to have a fire resistance rating of at least 1 hour, and batteries may not sit directly beneath a required exit.

For a battery inside the living space itself, the bulletin says the ESA is not aware of any product approved for use in Canada bearing the markings needed to go there.

The product matters too. The bulletin says a battery system must be approved for use in Canada and installed to its maker's instructions. Tesla's Powerwall 3 datasheet rates the unit for both indoor and outdoor use, while Solar X Canada, a seller in this index, lists the same unit in its comparison table as an outdoor or garage product, not for indoor installation. Ask the installer which instruction it is following for the unit it proposes.

GTA housing makes this practical. A downtown semi with no garage and a narrow side yard has fewer allowed spots than a detached house with a double garage. Ask each installer where it would mount the unit, why, and what that does to the wiring run and the price.

Seven questions, asked of every company, make the quotes comparable on more than price:

• Do you take battery-only jobs, or only batteries with a new solar system?
• Who does the electrical work, and what is the ECRA/ESA licence number?
• Who files the ESA notification of work, and is it in the price?
• Where would you mount the unit on this house, and what decides that spot?
• Which products do you install, what is the usable capacity of each in kWh, and are you in the battery maker's installer programme?
• Does the quote include the backup wiring, such as a separate panel for the circuits kept on in an outage?
• Who handles service calls and warranty claims, and from which location?

The installer programme can decide the warranty. Tesla's Powerwall warranty for Canada applies to a unit "purchased from Tesla or a Tesla certified installer in Canada", so a Powerwall bought anywhere else falls outside it.

Price per usable kWh is covered in the guide to comparing home battery quotes, and capacity in the guide to sizing a home battery for GTA outages. The battery cost guide lists the published price ranges with their sources.