What a Cambridge roof produces in a year
Cambridge's modelled yield is about 1,142 kWh a year for every kW of capacity installed, from Natural Resources Canada's photovoltaic potential data. A 7 kW system therefore models at roughly 8,000 kWh a year and a 10 kW system at roughly 11,400 kWh. Those are figures for a south-facing, unshaded roof at a reasonable pitch, so treat them as the upper bound for your address rather than the expected result.
The gap between that upper bound and your actual roof comes from orientation, pitch and shade. A west-facing roof still works but gives up output over a year against a south-facing one, and anything that clips the array through the afternoon costs you on every sunny day. Compare quotes on modelled annual kWh for your specific roof, not on panel count.
GrandBridge bills residential customers on time-of-use pricing, which makes the timing of your own consumption part of the economics. Electricity you use at the moment you generate it never crosses the meter in either direction, so it never becomes an export credit and never becomes a billed import. Shifting laundry, dishwashing or vehicle charging into daylight hours, or adding storage so evening loads come off a battery, changes what the same array is worth to you.
Connecting to GrandBridge and how the credits work
GrandBridge connects residential solar as Micro-Distributed Generation for systems up to 12 kW, and the sequence is defined: submit an application with a single-line diagram, receive an Offer to Connect, pay the connection cost, complete the Connection Agreement, then pass an Electrical Safety Authority inspection before GrandBridge installs the bidirectional meter. The connection cost is its own line item in that process, so ask early whether your installer's quote includes it or whether it lands on you separately.
Once you are running, surplus generation is credited under Ontario's net metering rules kWh for kWh at the retail electricity rate, and GrandBridge puts those surplus credits on a separate monthly statement rather than folding them silently into the main bill. Credits expire after 12 months unused, and Ontario pays no cash for net annual excess, so the practical ceiling on a useful system is your own yearly consumption rather than the size of your roof.
One part of the bill stays put. GrandBridge's residential rate card carries a fixed monthly charge of $34.56, and a fixed charge is billed for having the connection at all rather than per kilowatt-hour, so it is the portion an array does not touch. Factor that in when you model what your bill looks like afterwards, and be sceptical of any projection that shows a bill going to nothing.
The 12 kW threshold is recent. On May 1, 2026 the Ontario Energy Board raised the simplified micro embedded generation limit from 10 kW to 12 kW, which brought more full-size residential systems into the streamlined process. If a design comes back above 12 kW, ask what connection route that puts you on before agreeing to it.
Heritage sign-off in Galt, Blair and Dickson Hill
Cambridge has three Heritage Conservation Districts under the Ontario Heritage Act: Blair Village, Dickson Hill, and the Main Street district in the former city of Galt. Inside those areas, exterior changes such as solar panels may need heritage sign-off on top of the usual building permit. Elsewhere in Cambridge, homes are freehold with no such overlay and no condo-board style restriction on what goes on your roof.
If you are inside a district, plan for the approval rather than around it. Heritage review tends to focus on what is visible from the street, so the array layout that clears review most easily is often not the one that captures the most sun, and that trade-off is better identified at the sketch stage than after equipment is ordered. Confirm your address against the district boundaries before you commission a full design.
What Cambridge's housing mix means for your roof
About 56.8 percent of Cambridge dwellings are single-detached houses, which is the case a solar designer can work with most freely: one owner, one roof, and usually enough continuous plane to lay out a full-size array without splitting it across faces. Semi-detached homes are about 7.3 percent, and there a shared party wall and often a shared chimney become fixed constraints on layout and on where racking and conduit can run.
Row houses are about 12.3 percent of the stock. Row roofs give narrower planes and often shared structure with the neighbouring units, which caps how many panels fit and can complicate anchoring, so the realistic system on a row house is frequently smaller than the household's consumption alone would justify. That is a reason to run the yield arithmetic against your actual roof area before deciding whether the project makes sense.
Apartments split into about 14 percent of dwellings in buildings under five storeys and about 5.9 percent in buildings of five storeys or more. In both cases the roof is controlled by the building rather than the resident, so the decision sits with a landlord or a condominium corporation. If that describes your home, the useful first step is asking whoever owns the roof, not booking a site visit.
Rebates and financing for Cambridge homeowners
Ontario's Home Renovation Savings Program is the main residential incentive. It launched in January 2025 and was expanded for the 2026-27 program year running April 1, 2026 to March 31, 2027, with combined rebates of up to $10,000 for solar PV paired with battery storage. Note the pairing: the rebate is built around solar plus storage, not panels alone, which lines up with GrandBridge's time-of-use billing, where using your own generation is worth more than exporting it and claiming a credit back later.
There is a configuration question to resolve before you apply. Homeowners taking the HRSP solar incentive are generally directed to a load displacement setup rather than the full net metering arrangement described above, so the rebate and the GrandBridge credit statement are not automatically part of the same package. Ask your installer which one they are applying for, and confirm the current rules, because the answer changes how your bill is calculated for the life of the system.
Federal help is limited. The interest-free Canada Greener Homes Loan of up to $40,000 stopped accepting new applications on October 2, 2025 and is only funding loans approved before then. 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, with solar PV federally eligible but each province setting its own technology list. Canada has no federal investment tax credit for residential solar. Separately, some Ontario municipalities and utilities periodically offer financing such as local improvement charges or on-bill repayment, and what is available changes often, so ask what is open locally while you are collecting quotes.