Home – Military – Canada throws a solar panel into a frozen pond, and the foam detail may solve one of winter power’s hidden problems
Canada has tested a floating solar system that kept producing electricity through freezing winter conditions, even as ice and snow created the kind of problems that usually make water-based solar projects harder to run.
The small experimental plant, deployed on a stormwater pond in Ontario, used flexible solar panels attached to waterproof foam and an air-bubbler system under the surface to stop ice from locking the array in place.
That may sound like a niche engineering trick, but it points to a bigger question for clean energy. What happens when solar panels are placed not on rooftops or fields, but on ponds, reservoirs, and other water surfaces in places where winter can be brutal? The Western University project suggests that, at least on a test scale, floating solar can survive that challenge while producing useful power and cutting water loss.
The system was not huge. Researchers built a 7 kilowatt foam-backed floating photovoltaic installation on a pond in Ontario, using 40 semi-flexible monocrystalline modules divided into four smaller arrays. The pond itself measured about 15,900 square feet, and the panels covered only a small share of the water surface.
That modest size is part of the point. Instead of jumping straight into a large commercial plant, the researchers tested whether the basic design could handle real cold-climate conditions. In practical terms, that means snow, freezing water, wind, and the slow grind of winter that anyone in Canada knows well.
Unlike many floating solar systems that sit on larger plastic pontoons, these modules were bonded directly to polyethylene foam slabs. The panels floated about 0.4 inches above the water, keeping the design low and flat rather than tilted high into the wind.
Floating solar is often attractive because it can generate electricity without taking up farmland or other valuable ground. But in cold regions, water is not just a convenient platform. It is also a moving, freezing, expanding surface that can damage equipment if the system is not designed carefully.
The foam approach was meant to make the array simpler and closer to the water. That lower profile can reduce exposure to wind, which matters because floating platforms can face different stresses than panels bolted onto a roof or field rack.
There is another wrinkle. Solar modules behave differently depending on temperature, wind, and nearby surfaces. The researchers found that standard solar temperature models did not fully match what happened in winter with a flat, foam-backed system, which means cold-climate floating solar may need its own playbook.
The clever part was under the panels. The team used air lines connected to a pump on shore, creating bubbles that rose from below the pond surface. That movement helped bring slightly warmer deeper water upward, keeping open water around the array instead of letting ice trap it.
According to the study summary, the air-bubbler maintained “ice-free open water” through the winter while using very little extra energy. The added consumption ranged from 1.9 kWh to 893 kWh, equal to 0.02% to 14.5% of the system’s total annual output.
That range matters. If a system needs too much energy just to protect itself from winter, the benefit starts to fade. Here, the researchers found that the anti-ice system could work with what they described as negligible additional energy use, although larger tests will be needed before anyone treats it as a commercial answer.
A regression model developed in the study indicated that the foam-based floating solar system generated 7.7 MWh per year. That was up to 2.7% more energy than the comparison photovoltaic models used in the research.
Joshua M. Pearce, the corresponding author, told pv magazine the system showed a “pretty nice energy yield advantage.” That does not mean every pond should suddenly become a power plant. It does mean the cold-weather penalty for floating solar may be more manageable than many developers feared.
For people thinking about the electric bill, this is the practical takeaway. A system that can keep working during the darkest, coldest part of the year has more value than one that becomes fragile when power demand rises and conditions get rough.
The project was not only about electricity. By shading part of the pond, the panels also reduced evaporation. The study found that evaporation reduction scaled with pond coverage, and if 50% of the pond were covered, water savings could reach about 245,000 gallons per year.
That is not an abstract benefit. In farming areas, reservoirs, irrigation ponds, and stormwater basins often sit under hot summer sun, losing water day after day. Floating solar can act like a partial lid while also producing power.
Still, there are tradeoffs. Covering water changes light exposure and could affect local ecosystems depending on the site. That is why larger deployments would need environmental review, not just energy calculations.
The study also looked at economics under a high off-grid electricity price scenario. In that case, the system showed a positive net present value of about $41,000 and a discounted payback period of 4.2 years.
That sounds encouraging, but the context matters. Off-grid power can be much more expensive than grid electricity, especially in remote or specialized settings. A system that looks attractive there may not pencil out the same way for every municipal pond or utility project.
At the end of the day, what this test really offers is not a finished business model. It offers proof that a cold-climate floating solar design can be built, monitored, and kept operating through ice and snow.
The next step is scale. A 7 kilowatt pond experiment is useful, but commercial floating solar plants need to survive larger waves, stronger winds, thicker ice, maintenance demands, and years of seasonal punishment.
The researchers argue that the platform is a “promising and adaptable” option for renewable power in cold regions. That is a careful claim, and it should stay careful for now. The idea has passed an important early test, but the harder exam will come on bigger water bodies and under real customer economics.
If it works, the payoff could be simple. More solar power without using more land, less water lost to evaporation, and a way to keep panels useful even when winter does what winter does.
The study was published in Applied Energy.
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