What a Mississauga roof produces in a year
Mississauga's solar potential is about 1,159 kWh a year for each kW of panel capacity installed, from Natural Resources Canada's municipal photovoltaic potential dataset. That figure describes a well oriented, unshaded array, so treat it as the top of the range for your address rather than a promise. A roof plane facing east or west instead of south, a chimney that shades part of the array through the afternoon, or a mature tree on the south side will each take a bite out of it. What the number is genuinely good for is sizing, because it lets you work backwards from your own annual electricity use to a system size instead of guessing at one.
Output in southern Ontario is heavily seasonal. A June day produces several times what a late December day does, and snow lying on the panels can flatten production for stretches of the winter. Because Alectra settles net metering accounts month by month, that swing lands directly on your bill: summer months build a credit balance and winter months draw it back down. Sizing against your annual consumption rather than against one summer bill is what makes the seasonal swing work in your favour.
Two things are worth checking before a design is drawn: the age of the roof covering, and how much genuinely unshaded area a single roof plane offers. Panels are warranted for decades, so if the roof covering is near the end of its life it is cheaper to replace it first than to pay later for a removal and reinstall.
Who controls the roof in Mississauga
Mississauga's housing stock, per StatCan's 2021 structural type data, is led by single-detached houses at 37.1% of dwellings, but it carries a high-rise apartment share of 27.3%, which is unusually large for a GTA suburb. That second number matters more than it looks. If you live in a tower, the roof is not yours to decide about: the decision belongs to the building owner or the condominium corporation, and the first useful step is asking whether roof access is available at all, before you spend time talking to installers. Low-rise apartments under five storeys, about 7% of dwellings, sit in exactly the same category.
For the roughly 37% in single-detached houses the roof is usually yours outright, and there is normally more than one usable plane to choose between. Row houses, about 14% of dwellings, are a different design problem: the usable south-facing section is narrower, which can cap how many modules physically fit and therefore cap the system size regardless of what your consumption would justify. Semi-detached houses, about 11%, generally still allow an individual install, but the roofline is shared with a neighbour, so anything running toward the party wall needs coordinating.
The practical version of all this is to settle which category your home falls into before you collect quotes. An owner of a freehold house deals with the city and with Alectra. An owner of a unit in a building deals with a board first, and the answer there can be no for reasons that have nothing to do with solar.
The building permit, and what filing it costs
Solar panels appear on Mississauga's published list of projects that need a building permit, so this is not optional and not something to find out about after a crew is booked. The city's minimum residential building permit fee is $244, plus a $50 administrative fee when the application is submitted online. Other project costs follow the city's Building Permit Fee Schedule.
Read the $244 as a floor rather than a total. It is the minimum residential fee, and the fee schedule is what governs the assessment on a specific project. Most installers file the permit for you as part of their scope, which is normal, but ask two questions before you sign a contract: whether the permit fee sits inside the quoted price or is billed on top, and who carries the delay if the application comes back incomplete.
The city permit is also not the same approval as the electrical sign-off. Alectra's connection process requires an installation inspected by the Electrical Safety Authority, plus commissioning, which is a separate step on its own timetable. A project can clear the city and still be waiting on the utility side, so treat the two as parallel tracks rather than one queue.
Three heritage districts, and the listed property question
Mississauga has three designated Heritage Conservation Districts: Meadowvale Village, Old Port Credit Village and Streetsville. If your address is inside one, check that district's Heritage District Plan to see whether a rooftop array counts as an alteration that needs heritage approval. The plans are district specific, so what holds in one district is not automatically what holds in another.
There is a second case that is easier to miss. A property can be listed for its heritage interest without being designated. Listed, non-designated properties do not need heritage approval, but they may need a Heritage Impact Assessment. So there are two separate questions to settle early: whether your property sits inside one of the three districts, and whether it is listed. Answer both before a designer commits to a panel layout, because a layout drawn purely for the sunniest plane may have to be redrawn, and redrawing costs time you did not budget for.
For most Mississauga addresses neither applies, and the approvals that decide your schedule are the city building permit and Alectra's connection process.
Alectra's Offer to Connect and the cost estimate inside it
Alectra treats residential solar of 12 kW or less as a Micro Generator connection. The sequence opens with a preliminary consultation and a Form C connection application, and the step that decides your budget is the one after that: Alectra returns an Offer to Connect carrying a cost estimate. That estimate is what the utility charges to connect you, and it is separate from what an installer quoted for the equipment going on your roof. Reaching that offer before you commit is the whole point of doing the paperwork in order.
After the offer comes the Electrical Safety Authority inspected installation and commissioning, then a signed Connection Agreement, and only then does Alectra install the bidirectional meter. The Connection Agreement is between you and Alectra rather than between Alectra and your installer, so read it rather than signing where the sticker points.
The 12 kW ceiling is newer than it looks. As of May 1, 2026 the Ontario Energy Board raised the simplified micro embedded generation threshold from 10 kW to 12 kW, which pulls more residential systems onto the streamlined path. If a quote you are considering lands just above 12 kW, ask what the extra capacity costs you in review time before you accept it.
What an exported kilowatt hour earns is a bill credit, not a cash payment. Ontario credits exports kilowatt hour for kilowatt hour at the retail rate through your distributor, and Alectra resets a credit balance carried for 12 consecutive unused months to zero at the end of that month. Alectra bills residential customers on time-of-use pricing, so the hour in which you avoid buying power changes what the avoided kilowatt hour was worth. That is the honest reason to price a battery, rather than simply buying a larger array.
What a Mississauga homeowner can actually apply for
The live provincial programme is Ontario's Home Renovation Savings Program, which offers combined rebates of up to $10,000 for solar PV paired with battery storage. It launched in January 2025 and was expanded for the 2026-27 programme year, which runs April 1, 2026 to March 31, 2027.
One condition on that programme bears directly on everything above. Homeowners who take its solar incentive are generally directed to a load-displacement configuration rather than full net metering. Those are two different ways of connecting the same hardware and they treat exported power differently, so confirm the current rules with your installer and with Alectra before you apply, rather than assuming the rebate and the Alectra net metering path stack.
Federally, the Canada Greener Homes Loan, interest free up to $40,000, stopped accepting new applications on October 2, 2025, and only previously approved loans are still being funded. Its replacement, the Canada Greener Homes Affordability Program, launched in September 2025 and delivers no-cost retrofits through participating provinces, which do not currently include Ontario, for low to median income households; solar PV is federally eligible, but each province sets its own technology list. Canada has no federal investment tax credit for residential solar, so do not build a budget assuming one appears.
Some Ontario municipalities and local utilities periodically offer financing that can apply to solar, such as a local improvement charge or on-bill financing. Availability is local and changes often, so ask what is currently offered in your service area instead of relying on a list you read somewhere.