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Is a Whole House Generator Worth It? Run the Numbers

Last updated:ByStandby Power Desk

Ten years of a 14 to 18 kW standby generator costs roughly $11,900 to $18,000 once the install, the servicing and the fuel are counted. For that to pay back, outages have to cost you more than about $1,200 a year. Most GTA households are nowhere near that, and this tool will say so.

Put the numbers against each other

Over 10 years

No. It is insurance

It pays for itself in about 37.0 years at the cheap end of the published install range. That is outside the horizon you set, though not by much.

Installed, once (RenoHouse, Toronto, 2026 guide)
$9,500–$13,000
Servicing, every year (A1 Generator Monitoring; TrueSource)
$200–$450/yr
Fuel, every year (Generac spec sheet; Enbridge Rate 1)
$43–$46/yr
Total to own it for 10 years
$11,933–$17,964
Outage cost avoided over 10 years (your figure)
$5,000
Still out of pocket by
$6,933–$12,964

Payback is measured against the CHEAP end of the install range, which is the generator's best case: if it cannot pay back at its cheapest it certainly cannot at its dearest. Left out of the arithmetic on purpose: the $40,000 flooded-basement figure, because exposure is not expenditure and dropping it in makes every generator pay for itself in year one; and any resale-value or insurance-discount claim, because there is no Canadian source for either.

The answer most of these pages will not give you

A whole house generator usually does not pay for itself, and a calculator that tells you otherwise has almost certainly put its thumb on the scale. The commonest way to do that is to fold a flooded-basement figure into the payback: Public Safety Canada's average of over $40,000 is a real number, and dropped into an annual calculation it makes every generator on the market pay back in year one. It is kept out here for exactly that reason, and shown separately on the outage cost calculator as exposure rather than expenditure.

The other two thumbs are resale value and an insurance discount. Both get asserted constantly and neither appears anywhere on this page, because this register has no Canadian source for either. If your own insurer offers a discount for a permanently installed standby with an automatic transfer switch, that is a real saving and worth a phone call, but a percentage we cannot trace is not going in a calculator.

None of which is an argument against buying one. It is an argument for buying it as what it is. Nobody expects house insurance to pay back, and nobody calls it a bad purchase for failing to. The useful question is not whether the generator earns its price but whether the risk it removes is one you want to keep carrying, which is a question about your sump pump, your freezer, your work and how often your street actually goes dark.

What actually moves the answer

The annual outage cost, by a distance. Everything else on this page is a published range that barely moves: the install is what it is, servicing is $200 to $450 whatever you do, and fuel for a machine that runs a day a year is under fifty dollars on natural gas. The variable that decides it is what a blackout costs your household, and that is the one number this site cannot source for you.

After that, fuel choice. The same 22 kW unit running 120 hours a year costs about $217 of natural gas at the low end and about $804 of propane, because propane is roughly four times the price per unit of energy delivered. Over ten years that difference is larger than the servicing bill. If an Enbridge main is at the property, running a gas line to the generator changes this calculation more than any other single decision, and the gas line cost guide prices it.

And size, though less than you would think, because a bigger machine mostly costs more to buy rather than more to run. Work out what you actually need with the sizing calculator before pricing anything, and if the verdict here is no, the standby or portable picker is the next question rather than the end of it.

Frequently asked questions

Is a whole house generator worth the money?

On money alone, usually not, and it is worth saying so plainly. A 14 to 18 kW standby generator costs $9,500 to $13,000 installed per RenoHouse, plus $200 to $450 a year to service and a modest fuel bill, which comes to roughly $11,900 to $18,000 over ten years. For that to pay back, outages have to be costing you more than about $1,200 a year, every year. Most GTA households are nowhere near that. What a generator buys is the removal of a risk, which is what insurance is, and nobody expects house insurance to pay back either.

When does a standby generator actually pay for itself?

When outages are frequent, long and expensive at the same time. At $4,000 a year of loss and 120 hours of running, the same 14 to 18 kW unit pays back in under three years. That describes a rural property on overhead lines with a sump pump, a freezer full of food and someone working from home, not a downtown semi on buried cable. The tool above will show you which of those you are, and it will tell you when the answer is no.

Why is the flooded basement figure left out of the payback?

Because it would break the arithmetic in the generator's favour. Public Safety Canada puts the average cost to repair a flooded basement at over $40,000 and lists sump pump failure among the causes insured against, which makes it a genuine reason to own a generator. But it is a risk you carry, not a bill you pay every year, and dropping $40,000 into a payback calculation makes every generator on the market pay for itself in year one. That is the sort of number that makes a calculator persuasive and useless at the same time.

What does it cost to keep a generator running each year?

Servicing is $200 to $450 a year: A1 Generator Monitoring lists an annual service on a 7 to 22 kW air-cooled unit at $350 in Ontario, and TrueSource Generators quote a Canada-wide annual plan at $200 to $450. Fuel is smaller than people expect for a machine that mostly does not run. A 22 kW unit on natural gas burning 24 hours a year at half load costs about $43 to $46 of gas, because Enbridge's marginal rate is under 30 cents a cubic metre. On propane the same running is roughly four times that.

Does a generator add to my home's value or lower my insurance?

Both are claimed often and neither is on this page, because this register has no Canadian source for either figure. They are exactly the kind of number that gets asserted in sales copy and never measured. If your insurer offers a discount for a permanently installed standby generator with an automatic transfer switch, that is a real saving and worth asking about directly, but we are not going to publish a percentage we cannot trace.

What if I only care about the sump pump?

Then the sums change shape, and a portable generator may do. A sump pump is a small load, 500 to 1,050 watts running depending on horsepower, and keeping just that circuit alive does not need a whole-house machine. Our standby versus portable picker weighs that trade-off, and the transfer switch calculator prices the legal hookup for a portable at $900 to $2,300, which is an order of magnitude below a standby install.

Where these figures come from

Install prices from named Toronto and Ontario contractors, servicing from two Canadian sources whose figures Home Generator Index widens across rather than averages, fuel consumption from Generac's own spec sheets and gas prices from Enbridge's published Rate 1 notice. The annual outage cost is yours, and the page is explicit that it is the number the whole answer turns on.

If the answer was yes, or yes enough

A verdict of "insurance rather than investment" is still a decision to buy something, and the next step is finding out what it costs at your address rather than in a published band. Of the 56 companies on this register doing standby work in the Greater Toronto Area, average rating 4.74★, these three lead the review-weighted score. Placement here is not for sale.

See all 56 standby generator installers