Generator or Home Battery for Power Outages in Canada: How to Choose (2026)

Last verified October 7, 2026 against Health Canada carbon monoxide guidance, the Electrical Safety Authority, the Ontario Energy Board, and the Home Renovation Savings program.

A home battery is usually the better choice for short outages and everyday savings: when installed for backup, it switches on automatically, runs quietly, needs no fuel, and can recharge from solar. A fuel generator is usually the better choice for long outages, especially in winter, because it keeps running as long as it has fuel. The right answer for your home depends on how long your outages last and which circuits you need to keep on.

Want to see what size of battery your home would need? Run your address and usage through the free solar and battery estimator.

Key takeaways (as of October 7, 2026)

1. Batteries win on convenience, no fumes and daily savings. Generators win on runtime.
2. A battery's runtime depends on its usable kWh and how much power you draw.
3. Electric heat drains a battery fast. Plan winter backup carefully.
4. Fuel generators must never run indoors, in a garage or in a shed.
5. Connecting a generator to house wiring requires a transfer switch installed by a qualified electrician.
6. In Ontario, a battery paired with a new solar system can qualify for a rebate of up to $5,000.

Both keep your lights on when the grid goes down, but they work very differently. A battery stores electricity and releases it instantly. A generator burns fuel to make electricity on demand. The table below compares the three common options side by side so you can see which strengths matter for your home.

Divide the battery's usable energy by the power your home draws. A battery with about 13.5 kWh of usable storage can run essential loads for roughly a full day, but only a few hours if it also has to run electric heating. Your actual runtime depends on which circuits are connected and how hard they work.

Think of a battery like a water tank. The size of the tank is the kWh. How fast you drain it is your load in kW. Turn on more taps and the tank empties sooner.

Worked example: one 13.5 kWh battery in a Canadian home

Assumptions: 13.5 kWh usable storage, 90% efficiency from battery to outlets, no solar recharge during the outage.

Method: 13.5 kWh × 90% = about 12.2 kWh delivered, divided by the average load. These loads are illustrations, not measurements. Your own usage data gives a better number.

Runtime is only half the question. A battery also has a power limit in kW, which decides what can run at the same time. Large motors such as well pumps, central air conditioners and heat pumps need a battery system rated to start and run them, so check the power rating, not just the kWh. Batteries installed outdoors or in unheated garages can also be limited in extreme cold, so check the operating temperature range for a Canadian winter.

Two more things change this math. With solar panels, a battery can recharge on sunny days, which stretches a long summer outage. In winter, short days and snow cover mean little recharging, so plan as if the battery gets no help. Choosing which circuits stay on matters just as much; see our guide to critical loads panels versus whole home backup.

As long as it has fuel. A standby generator connected to a natural gas line can run for days if the gas supply holds, while a propane unit runs until its tank is empty. A portable generator runs for one tank at a time and must be shut off and allowed to cool before refuelling. That long runtime is the generator's biggest advantage over a battery. During long outages, follow the maker's service schedule.

The trade off is everything else. Generators make noise and exhaust, need regular engine servicing, and do nothing for you on the days the power is on. Propane and gasoline also need safe storage, and a portable unit means going outside to start and refuel it, often during a storm.

A battery can earn its keep every day; a generator only pays off during outages. On Ontario's Ultra Low Overnight plan, power costs 3.9 cents per kWh overnight and 39.1 cents on weekday evenings from 4 to 9 p.m., under prices in effect until October 31, 2026. A battery can charge cheaply and cover the expensive hours.

Those prices are set by the Ontario Energy Board, and new prices take effect November 1, 2026, so check the current numbers before you run the math. How much a battery actually saves depends on how much of your evening use it can shift. Our guide to TOU versus ULO in Ontario explains the plans, and the Battery Without Solar in Ontario post walks through the honest arbitrage math.

Upfront cost works the other way. A portable generator usually costs far less than a battery. Standby generators and batteries are both major home projects, so compare installed quotes for both rather than equipment prices alone.

Rebates can close the gap. Ontario's Home Renovation Savings program pays $300 per kWh of battery storage, up to $5,000 and up to 50% of the cost, but only when the battery is paired with a new solar system. Systems that take the rebate cannot also use net metering. Approval is required before you buy or install anything, and rebates are never guaranteed. Other provinces run their own programs, so check yours. If you are not adding solar, read whether a battery without solar makes sense in Ontario.

Compare both options for your home. The free estimator models solar and battery sizing for your address and usage in a few minutes.

Yes, and for some homes it is the best answer. The battery handles short outages instantly and silently, and the generator takes over for long winter outages when the battery runs low. Some battery systems accept a generator as a backup charging source, but not all of them do.

If you want both, check two things before you buy. First, confirm that the battery system you are considering supports a generator input. Second, make sure the generator and battery are wired through approved transfer equipment, so neither one can send power into the utility lines during an outage.

Generators carry a serious carbon monoxide risk. Health Canada says never to use a fuel burning generator indoors, in a garage or in a shed. Carbon monoxide has no colour or smell, so every home with a generator needs working carbon monoxide alarms with battery backup.

Wiring matters as much as fumes. If a generator powers your home's circuits, it must connect through a properly rated transfer switch installed by a qualified electrician, following the Canadian Electrical Code and local rules. Never plug a generator into a house outlet: it can send power back into the utility lines, which is dangerous for utility crews.

Batteries have their own rules. In Ontario, the electrical code limits where a home battery can go, and it bans batteries in sleeping areas and in rooms that open directly into them. Our guide to Ontario's approved home battery locations explains them. In Ontario, almost all electrical work also needs an Electrical Safety Authority notification, and anyone you hire for electrical work must be a licensed electrical contractor.

Answer these five questions and the right choice usually becomes clear. If most of your answers point the same way, that is your answer. If they split, a battery for daily use plus a generator for long outages may be worth pricing out.

1. How long do your outages usually last? A few hours points to a battery. Several days points to a generator.
2. How do you heat your home? Electric heat drains a battery fast. Gas heat with an electric fan is much easier to back up.
3. Which circuits must stay on? Fewer essential circuits means a smaller, cheaper battery.
4. Are you on a time of use rate plan? If yes, a battery can save money every day, not just during outages.
5. Are you planning solar? A battery paired with new solar can qualify for rebates in some provinces and can recharge during long outages.

Every home draws power differently, so the best backup plan starts with your own numbers: your usage, your heating, your rate plan and your outage history. Use the free solar and battery estimator to see what a battery could cover for your home, then compare installed quotes before you decide.

Editorial note: Runtime figures are illustrations based on stated assumptions, not measurements. Rates, rebates and electrical rules change; confirm current details with your utility, your provincial program and a qualified electrician before buying. This article is informational and is not electrical, financial or legal advice.

1. Health Canada, Carbon monoxide: preventing exposure.
2. NB Power, Generator safety.
3. Home Renovation Savings, Solar panels and battery storage.
4. Ontario Energy Board, Electricity rates.
5. Electrical Safety Authority, 27th edition of the Ontario Electrical Safety Code effective.
6. Electrical Safety Authority, Bulletin 64-8-2, battery energy storage at residential occupancies (PDF).
7. Save on Energy, Home Renovation Savings upgrades.
8. Town of Riverview Fire, Generator and carbon monoxide safety, transfer switch under the Canadian Electrical Code (PDF).