Written and reviewed by the Solar X Team. ESA/ECRA Licensed Electrical Contractor, Licence 7017538. 10,000+ solar and battery installations, 118 MW installed across Canada. Last verified against the sources listed at the end of this article.
Why is fall 2026 different from a normal fall?
Two events land back to back this autumn, and both push the same direction.
First, Ontario Power Generation is scheduled to take all four remaining reactors at the Pickering Nuclear Generating Station offline in September 2026 for a multiyear refurbishment, per OPG's own project updates. A Bruce Power unit is scheduled to follow in the same window. That removes a large block of baseload generation from the grid at once.
Second, the Ontario Energy Board sets residential electricity prices once a year, on November 1, and the wholesale forecast the OEB commissioned for the coming winter points sharply upward. We already published the full breakdown of that forecast, the drivers behind it, and what it could mean for bills in our guide to what happens to Ontario hydro rates in November 2026, so this article will not repeat it. What matters here is narrower: the final household prices had not been announced as of September 2026, and the date they take effect is fixed.
Nobody can tell you today exactly what your rate will be this winter. What is already certain is the direction of the pressure and the date the reset takes effect. A solar project started in September is a project whose approvals run during October rather than starting from zero in December.
What do today's electricity prices mean for solar timing?
Every household on the Regulated Price Plan is on one of three plans, Time of Use, Ultra Low Overnight, or Tiered, and our Ontario electricity rates guide keeps the full plan by plan tables current. For the timing decision, four numbers do the work.
| Rate | Price today | Why it matters for timing |
|---|---|---|
| TOU on peak, summer weekdays 11 a.m. to 5 p.m. | 20.3 cents per kWh | The hours a rooftop system produces most, priced at the TOU maximum until the reset |
| TOU off peak, weekdays 7 p.m. to 7 a.m., weekends and holidays | 9.8 cents per kWh | Today's floor for grid power on TOU |
| ULO on peak, weekdays 4 p.m. to 9 p.m. | 39.1 cents per kWh | The evening price a solar and battery pairing is designed to avoid |
| ULO overnight, every day 11 p.m. to 7 a.m. | 3.9 cents per kWh | The cheap charging window for battery owners |
Source: Ontario Energy Board electricity rates, prices set November 1, 2025. Verified September 2026. Every number in this table resets on November 1, 2026.
The shape of the problem sits in the first and third rows. Summer on peak covers the middle of the day, which is exactly when a rooftop system produces most of its power, and the ULO evening price is already 39.1 cents. Whatever the OEB announces this fall, the new prices will apply to whatever your home still draws from the grid.
How long does a solar project actually take in Ontario?
The part people picture, panels going onto the roof, usually takes one to two days. Almost all of the calendar goes to everything around it, and most of those steps are not controlled by any installer.
A residential project in Ontario moves through a fixed sequence: a site assessment, system design, contract, building permit, installation, inspection by the Electrical Safety Authority, connection approval from your local utility, and rebate processing where a rebate applies. Each approval belongs to the permit office, the ESA, or the utility, and their queues vary by municipality and season. That is why no honest installer will promise you an energization date, and why we do not.
This is the whole timing argument in one sentence: you cannot compress the approval queue, you can only decide when you join it. Joining it in September means the paperwork phase runs through fall. Joining it in December means starting the same clock with winter weather layered on top.
On cost, our current Ontario solar cost guide puts typical residential systems roughly in the $18,000 to $35,000 range before incentives, as a market estimate that depends on system size, roof complexity, and equipment. Payback estimates there run several years to over a decade depending on rates, usage, and rebate path. Every home is different, which is exactly what the assessment step exists to answer.
Which season is the best time to install solar panels in Ontario?
Solar is installed in Ontario in every month of the year. The question is not whether a season works, but what each starting point sets in motion.
| Start window | Approvals mostly run during | Roof conditions at install | What the system catches first |
|---|---|---|---|
| September to October | Fall | Cool and dry, favourable for roof work | The winter rate period, then the full spring ramp |
| November to February | Winter | Snow and ice can shift install days | Spring production soon after energization |
| March to May | Spring | Good, but the busiest season begins | Peak summer, from later in the queue |
| June to August | Summer | Hot roof work during peak demand | Late summer, then the autumn decline |
Approval timing varies by utility and municipality and is never guaranteed in any season. The table shows tendencies, not promises.
Fall wins on the combination: comfortable install conditions, approvals that run before the worst weather, and a system that enters the high production months of spring already connected. Cold itself is not the enemy. Panels convert light, not heat, and cool temperatures improve panel efficiency, which is why we wrote a full guide on how solar panels perform in Canadian winters. The honest second place answer: the best alternative to starting in fall is starting whenever you actually start. A good project begun in January beats a perfect project postponed forever.
Where does the Home Renovation Savings rebate fit into timing?
As of September 2026, the Home Renovation Savings program, delivered by Save on Energy and Enbridge Gas with support from the Government of Ontario, is open and includes rooftop solar and battery storage. Per the program, the solar rebate is $1,000 per kW installed up to $5,000, and the battery rebate is $300 per kWh up to $5,000 when the battery is installed with new rooftop solar, for a combined maximum of $10,000. The program has no published end date, and its terms allow changes, so amounts and eligibility are only certain once an application is approved.
Two timing rules matter more than any deadline. Program approval must be in place before equipment is purchased or installed, so the application belongs at the start of your project, not the end. And the program rules make its solar and battery incentives incompatible with a net metering agreement: rebate systems must be designed for load displacement, meaning all generation is consumed on site with zero export to the grid, while net metering trades the rebate for one to one bill credits on exported power. In plain terms, net metering sends your surplus to the grid for a bill credit, and load displacement keeps every kilowatt hour at home. Choosing between the two paths is a real fork in the road, and we walk through it in our Home Renovation Savings rebate versus net metering decision guide. Also worth knowing for system sizing: since May 1, 2026, the OEB micro generation threshold for simplified residential connections is 12 kW AC, up from 10 kW.
When is waiting the right call?
Sometimes the right answer is not yet, and we would rather tell you that at the assessment than have you find out after signing.
Wait if your roof is near the end of its life. Panels last decades, and removing and reinstalling a system to replace shingles underneath it is an avoidable cost. Reroof first. Wait, or reconsider entirely, if your roof carries heavy shade or your household uses very little electricity. A system that cannot produce enough, or offsets a bill that is already small, may never justify its cost, and solar is simply not right for some houses. And think carefully if you plan to sell within a year or two, since system ownership and any attached financing carry implications a buyer will ask about.
Waiting for the OEB rate announcement itself is also a legitimate choice. The tradeoff is simple and worth stating plainly: the rate announcement will not shorten anyone's approval queue, and the reset takes effect on November 1 either way.
The bottom line
The best time to install solar panels in Ontario is the moment that gives your approvals room to run, and this year that points squarely at early fall. Pickering's four remaining units are scheduled to go offline in September 2026, the OEB resets prices on November 1, 2026, and the Home Renovation Savings program is open today with terms that can change. None of those facts guarantees your outcome. Together they make a strong case for finding out, this month, what solar would actually do on your specific roof.
Solar X is a Canadian residential solar and battery installation company serving homeowners across Ontario. A free assessment tells you your production potential, your rebate path, and your realistic range of outcomes before you commit to anything. Learn more about our approach on our residential solar page.
Frequently asked questions
What is the best month to install solar panels in Ontario?
September and October are the strongest months to start a solar project in Ontario. Approvals typically run through the fall, cooler weather favours roof work, and a fall start positions the system to enter the spring and summer production peak already connected. In 2026 there is an added reason: the Ontario Energy Board resets household electricity prices on November 1, 2026. Installation itself happens year round in Ontario.
Is fall a good time to install solar panels in Ontario?
Yes. A fall start lets the permit, ESA inspection, and utility approval steps run before deep winter, and the system enters the strong spring and summer production season already connected. Cooler weather is also easier for roof work. Fall 2026 adds one more factor: the Ontario Energy Board resets household electricity prices on November 1, 2026.
Can solar panels be installed in winter in Ontario?
Yes. Solar panels are installed year round in Ontario. Crews work in cold weather, and panels perform efficiently in low temperatures because they convert light rather than heat. Winter projects mainly face scheduling shifts around snow and ice on the roof. A winter start also means the approval steps run while the weather is at its worst, so the system can be producing by spring.
Should I wait for the November 2026 rate announcement before going solar?
Waiting is a legitimate choice, but be clear about what it buys. The announcement will not shorten anyone's permit, inspection, or utility queue, and the new prices take effect on November 1, 2026 whichever way they land. A homeowner who starts in September simply meets that date further along the approval process than one who starts after the news.
If the roof work takes only a day or two, what takes the rest of the time?
The physical roof work usually takes one to two days. Most of the calendar goes to the approval sequence: building permit, ESA inspection, utility connection approval, and rebate processing where a rebate applies. Those steps are controlled by the permit office, the Electrical Safety Authority, and your utility rather than the installer, so no completion date can honestly be guaranteed.
Do I lose the Home Renovation Savings rebate if I wait?
Not necessarily. As of September 2026 the Home Renovation Savings program is open with no published end date. Program terms allow changes at any time, so amounts and eligibility are only certain once your application is approved. Approval must also be in place before equipment is purchased or installed, which is a reason to start the application early rather than rush the shopping.
Will a system installed this fall produce anything over winter?
Yes. Panels keep producing through Ontario winters, and cold improves panel efficiency, though shorter days and snow cover reduce output compared with summer. A system energized in late fall contributes right away through the winter rate period and then enters the high production months of spring already approved and connected.
Sources
- Ontario Energy Board, Regulated Price Plan Price Report, November 1, 2025 to October 31, 2026, containing the Power Advisory LLC forecast: oeb.ca (PDF)
- Ontario Energy Board, Electricity rates: oeb.ca
- Ontario Energy Board, news release on November 1, 2025 price changes, October 17, 2025: oeb.ca
- Save on Energy, Home Renovation Savings program: saveonenergy.ca
- Ontario Power Generation, Neighbours newsletter, Pickering and Darlington, Winter 2026, confirming Units 5 to 8 offline in September 2026: opg.com