Commercial rooftop solar, planned around your facility.

On completed Green Integrations projects, payback typically falls in the 3–6 year range with a project IRR of 15–30%. The range varies by facility. Electricity consumption profile, available roof area, tariff structure, and access to provincial and federal incentive programs all affect the final figure. Facilities with high daytime loads and access to Ontario Save on Energy or the federal Clean Technology Investment Tax Credit tend to land toward the lower end of the range. A project-specific financial model — built from your utility data — is the only way to know where your project falls.

Installed commercial rooftop solar in Ontario typically ranges from $1.50 to $2.50/W DC for systems above 100 kW DC. Total project cost depends on roof type and condition, interconnection requirements, and complexity of the installation. An assessment gives you a project-specific figure rather than a per-watt estimate.

For projects where the goal is to offset a large portion of annual electricity consumption, it makes sense to look at efficiency and generation as part of the same plan. If a facility has meaningful lighting, HVAC, or controls inefficiencies, addressing those can reduce the consumption baseline. A solar system sized to a lower, optimized baseline tends to be a better fit for the building and produces stronger overall returns. This approach makes the most sense on projects where full or near-full electricity offset is achievable. Not every project warrants it — but when it does, having both under one roof simplifies the process significantly.

Most commercial solar projects qualify for stacked funding across three streams: Federal — Clean Technology Investment Tax Credit: refundable tax credit of up to 30% applied to eligible solar, battery storage, and electrification capital costs. Provincial — Ontario Save on Energy Solar Load Displacement Program: incentives up to $770K that support solar projects by funding systems that reduce baseline energy consumption. Federal — Enhanced First Year Capital Cost Allowance: 100% CCA accelerated depreciation on eligible clean energy investments in the first year. All three programs are identified and built into the project financial model as part of the assessment process.

Ontario commercial solar systems are designed for year-round performance, including winter. Cold temperatures can improve panel efficiency — the main variable in winter is available sunlight, not temperature. Production estimates are based on historical weather data for the specific project location, which accounts for seasonal variation in irradiance across Ontario, Alberta, and Nova Scotia.

Large flat industrial roofs are well suited for commercial solar. Ballasted or mechanically-attached racking systems work with most flat membrane roofs without penetration. Roof structural capacity, membrane condition, and remaining warranty life are assessed as part of the project scope. We have installed on BUR, TPO, Mod-Bit, Tar & Gravel, and metal deck roofs across Ontario, Alberta, and Nova Scotia.

Commercial solar systems in Ontario connect to the grid through the facility’s existing electrical service under IESO interconnection requirements. The process includes utility pre-application, engineering review, permit submission, ESA inspection, and utility sign-off. The interconnection process typically runs 8–16 weeks from application to approval, in parallel with construction. We manage the full process including coordination with IESO and the local distribution company.

System size depends on the facility’s electricity consumption, available roof area, grid interconnection capacity, and whether efficiency improvements are planned. For facilities targeting full or near-full electricity offset, understanding the building’s actual consumption profile before finalizing system size tends to produce better results. Completed installations range from 13.7 kW on a small food processing facility to 1,270 kW on a large food retail site in Mississauga.