For years, rooftop solar pitches to building owners and condo boards have led with the environment. That framing rarely survives a budget meeting. The better question is a financial one: is there unused roof space that could be turned into an asset that reduces the building’s operating costs? With Ontario’s current incentive in place, and federal tax measures available to eligible commercial owners, the answer for many low‑rise and mid‑rise buildings has changed.
What the Ontario incentive actually pays
The Save on Energy Retrofit program, delivered by the Independent Electricity System Operator, currently pays $770 per kW of AC capacity for rooftop solar systems larger than 10 kW, up to 1 MW, capped at 50 percent of eligible project costs including labour and materials. Smaller systems up to 10 kW DC receive $1,000 per kW DC. The system must be roof mounted and operate behind the meter, meaning the power is consumed inside the building rather than exported to the grid.
Two details matter for timing. First, incentive rates are reviewed twice a year and can move down: the rate for larger systems already dropped from $860 to $770 per kW effective June 30, 2026. Second, pre‑approval must be in place before equipment is ordered. Owners who wait for a future budget cycle may find a smaller incentive when they get there.
Commercial owners: federal tax incentives may apply
For eligible corporations, rooftop solar may also qualify for federal tax benefits. The Clean Technology Investment Tax Credit (CT ITC) can provide a refundable credit of up to 30 percent of eligible costs, calculated on the cost remaining after government assistance such as the Save on Energy incentive, with the full rate dependent on meeting prevailing wage and apprenticeship conditions during construction. Accelerated Capital Cost Allowance (CCA) allows qualifying equipment costs to be written off sooner for tax purposes. Both are subject to the corporation’s tax status and eligibility, and should be confirmed with a tax advisor before they are counted in a business case.
One important boundary: condominium corporations are non‑profit, tax‑exempt entities and generally cannot claim the federal credit or benefit from depreciation. For condo boards, the Ontario incentive is the one that counts, and it is still substantial.
Two models, one choice
Load displacement means the building uses everything the panels produce, cutting the hydro purchased for elevators, corridor lighting, HVAC, and other common‑area loads. This is the model the Save on Energy incentive supports. Net metering is the alternative: a larger system exports surplus power to the grid in exchange for credits on the utility bill, which can be carried forward for up to 12 months. The two are mutually exclusive, a project cannot claim the incentive and net meter at the same time. Which approach provides the stronger return depends on the size of your roof, the shape of your loads, and your rates, and that comparison is exactly what a feasibility study is for.
Which buildings are strong candidates?
- A large roof relative to building height. Low‑rise and mid‑rise buildings with generous flat roofs fit best. High‑rise towers usually have too little roof area for the load they carry.
- High daytime electricity use. Buildings that use more electricity during daylight hours can use more solar power on site, which improves project economics.
- A roof in good condition, or one whose replacement can be planned together with the solar work so the two projects do not conflict.
What a feasibility study tells you
A feasibility study estimates the installed system, projects annual generation and hydro savings, quantifies every incentive the owner is actually eligible for, and models payback under both the load displacement and net metering approaches. To give a sense of scale: a recent vendor concept for a mid‑rise building came in around a 45 kW solar system, roughly 54,500 kWh of annual generation, in the range of $6,800 per year in hydro savings, and a potential Ontario incentive of about $26,000 at the current rate, based on the system’s 34 kW AC inverter capacity. Actual system size, generation, savings, incentives, and payback will vary with site conditions, utility rates, installed cost, financing, and final design, which is why the study comes before any commitment, not after.
Where it can lead
If the study supports proceeding, the same engineering effort carries forward into solar and battery design, updated single line diagrams, utility applications, net metering coordination, incentive applications, and full management of the installation. Battery storage can also be looked at separately where it may provide additional value, since its payback can vary significantly with system size, operating strategy, incentives, and financing. If the board or ownership group is also considering future projects such as EV charging or heat pump conversions, the scope can be expanded to review the building’s available electrical capacity and how those future loads may be coordinated with the solar system.
If your building has a large usable roof area, the numbers are worth running. A feasibility study is a small, contained first step that gives your board or ownership group real figures to decide with.