Backup Generator Cost in Ontario: Portable and Standby
Ontario storms knock out power more often than they used to. Aging infrastructure and harsher weather mean blackouts that last hours or days. A backup generator keeps your heat, your sump pump, and your fridge running when the grid goes down.
So what does one cost? A portable generator runs about 1,500 to 5,000 dollars installed. A whole home standby system runs about 8,000 to 35,000 dollars depending on size and setup. Here is the full breakdown so you can budget with confidence.
Backup Generator Cost in Ontario
The price depends most on the type of generator and its size. Portable units cost the least and power a few essentials. Standby units cost more and run automatically, often powering the whole home.
| Generator type | Typical installed cost |
|---|---|
| Portable (essentials only) | 1,500 to 5,000 dollars |
| Small standby (7 to 10 kW) | 2,500 to 4,000 dollars plus unit |
| Mid standby (12 to 20 kW) | 8,000 to 15,000 dollars |
| Whole home standby (22 kW and up) | 15,000 to 35,000 dollars |
Most Ontario homes land in the 10 to 22 kW standby range, which balances cost against whole home coverage. Installation labour and materials usually run 3,000 to 6,000 dollars on top of the unit, more for complex jobs.
What Drives the Price
- Generator size in kilowatts. Bigger units power more and cost more.
- Fuel type. Tying into an existing natural gas line is cheaper than installing a propane tank.
- Distance from the panel and the gas meter, which affects wiring and trenching.
- The transfer switch type, which is required by law in Ontario.
- Whether your panel needs an upgrade to handle the system.
Portable vs Standby Generators
The choice comes down to how much you want running and how hands on you want to be.
Portable Generators
A portable unit is cheaper and powers essentials like a fridge, a sump pump, and a few lights. You start it by hand and connect it during an outage. It needs a safe transfer mechanism, never a direct plug into the home. An interlock kit or a manual transfer switch makes it safe and legal.
Standby Generators
A standby unit is permanently installed, runs on natural gas or propane, and starts automatically the moment the power drops. It uses an automatic transfer switch and can power your whole home. It costs more upfront but needs no effort during an outage, which matters most in winter.
The Transfer Switch Is Not Optional
A transfer switch isolates your home from the grid when the generator runs. This prevents backfeeding, which sends power back down the utility lines and can injure or kill the crews working to restore power. In Ontario, a proper transfer mechanism is required for any generator connection. A direct connection without one is illegal and dangerous.
| Transfer option | Typical cost |
|---|---|
| Interlock kit (portable) | 400 to 800 dollars |
| Manual transfer switch | 800 to 1,500 dollars |
| Automatic transfer switch (standby) | 1,500 to 3,000 dollars |
Does Your Panel Need an Upgrade?
Many Ontario homes need a panel upgrade before a whole home standby install, especially older homes with 100 amp service. If your panel is undersized, factor that in. See our guide on panel upgrade cost and the warning signs in our panel upgrade guide.
Permits and Why You Need a Licensed Contractor
A standby generator install needs an electrical permit and an ESA inspection. Permit fees vary by municipality and generally fall between 100 and 300 dollars. The gas connection needs a licensed gas fitter too.
This is not DIY work. In Ontario, the ESA states that a Licensed Electrical Contractor is the only business you can legally hire for the electrical side, and the transfer switch must be installed correctly to be safe. The safety stakes are real. The Electrical Safety Authority links 143 electrical related fatalities in Ontario between 2015 and 2024, and its 2024 Ontario Electrical Safety Report found that electrical fatalities outside of work rose 40 percent over the past decade.
Patience Cathcart, the ESA Public Safety Officer, said the findings show why safety has to reach beyond job sites, and that the agency stays focused on "educating the public, guiding industry."
See our ESA permit guide for how the permit works.
Generator Cost FAQ
How much does a whole home generator cost in Ontario?
A whole home standby system runs about 15,000 to 35,000 dollars installed, depending on size, fuel, and setup. Most homes use a 10 to 22 kW unit, and labour adds 3,000 to 6,000 dollars.
How much does it cost to install a backup generator?
A portable setup runs about 1,500 to 5,000 dollars installed with a safe transfer mechanism. A standby system runs higher because of the unit, the transfer switch, and the gas connection.
Do I need a permit to install a generator in Ontario?
Yes. A standby generator needs an electrical permit and an ESA inspection, plus a gas permit for the fuel connection. Your licensed contractor handles the electrical permit.
How much does it cost to run a home generator in Ontario?
For typical seasonal use, most homeowners spend under 50 dollars a month on average including maintenance, depending on fuel type and runtime.
Can I connect a generator without a transfer switch?
No. A transfer switch is required in Ontario. Connecting without one is illegal and can backfeed the grid, which endangers utility crews.
The Bottom Line
Budget 1,500 to 5,000 dollars for a portable setup or 8,000 to 35,000 dollars for a whole home standby system in Ontario. The big variables are size, fuel, and whether your panel needs an upgrade. Always use a licensed contractor, because the transfer switch and permit are what keep the install safe and legal.
Want backup power before the next storm?
Kolji Bros. Electrical sizes, installs, and permits backup generators across the GTA, transfer switch included. Call 1 866 565 5427 or request a free quote.