Largest Commercial Rooftop Solar Array in Ontario

Somewhere in Belleville, a rooftop that used to just shrug off rain and doze in the sun woke up to a serious new job. It now hosts Ontario’s largest commercial rooftop solar array, a 1.58 megawatt behind-the-meter system installed with zero disruption to continuous plant operations. Ballast designs solved the roof’s load limits, early coordination with the local utility cleared interconnection hurdles, and the finished array now avoids more than 480 tonnes of CO₂e every year while delivering a striking 575 percent lifetime return on investment. It is a perfect case study in how industrial roofs can quietly become industrial power plants.

Industrial electricity bills have a way of climbing more often than they fall, and SCHÜTZ Container Systems didn’t want its Belleville manufacturing plant just riding that trend indefinitely. As a leader in industrial packaging and container reconditioning, the company was looking to hedge against rising grid tariffs, trim operating expenses and meet its own corporate sustainability targets, all without touching a single production line. The answer sat directly overhead, under an expansive, underused rooftop that could carry a behind-the-meter solar system large enough to matter.

Before any panels went up, engineers ran load profile analyses and structural feasibility studies to confirm the roof could handle the weight and the local grid could handle the power. They also worked through the financial mechanics available to industrial solar in Ontario, the 30 percent Clean Energy Investment Tax Credit, Accelerated Capital Cost Allowance, and regional IESO programs, modelling out a business case before committing to a design. The numbers confirmed that a 1.57 MW rooftop array pencilled out to a 575 percent lifetime return on investment, something unusually strong for an industrial retrofit.

With approvals and structural permits in hand, the project moved into full engineering, procurement and construction, installing 1.582 MW of high-efficiency solar panels across the facility roof and wiring the system in behind the meter with zero disruption to continuous plant operations, a manufacturing site with no appetite for downtime. Commissioning followed ISO-9001 quality standards, and the finished array was integrated into an automated energy monitoring platform so performance could be tracked in real time rather than estimated after the fact.

None of it was simple to pull off on an active industrial site. Strict roof load constraints, complex local hydro interconnection rules and the hard requirement to never interrupt production all had to be solved simultaneously. Tailored ballast designs and an optimized panel layout worked around the structural limits, while early, sustained engagement with the local distribution company, combined with the provincial incentive frameworks already built into the financial model, cleared the interconnection bottlenecks before they could stall the timeline. Otter Energy delivered the turn-key engineering, permitting and installation work, with EcoGrid Renewables serving as project developer.

The result became Ontario’s largest commercial rooftop solar array at the time of its completion, avoiding more than 480 tonnes of CO₂ annually while generating millions in cumulative hydro savings over the system’s lifespan. It also quietly reduces SCHÜTZ’s peak grid demand and operational carbon intensity, a twofold benefit that shows up on both the utility bill and the emissions ledger.

What makes the Belleville array worth watching isn’t just its size. It’s the proof that heavy industrial operations, the kind with the least tolerance for disruption and the tightest margins for capital spending, can decarbonize and turn a profit while doing it. Thousands of similar plants and warehouses across the country are sitting on the same asset SCHÜTZ had all along: a roof that is quietly capable of far more than keeping the weather out, just needing someone to look up and use it.