Floating on 2.5 acres of a Florida theme park’s stormwater pond, 3,369 solar panels charge the electric bus fleet overnight while the shallow water cools them
The pond sits where stormwater has always gone: a shallow basin built to hold runoff, never to hold hardware.
Now it holds something else entirely.
Dark panels cover the surface, locked flat on interlocking floats.
Water cools the underside of floating panels in a way that concrete or asphalt never can, and the advantage can boost efficiency by up to 15 percent.
The water underneath is barely ten feet deep at its lowest point.
Yet the array already powers a fleet of electric buses overnight.
So what makes a basin this shallow the right platform for solar, and what does that warm water do to the panels sitting on it?
Why a retention pond works harder than it looks
A stormwater retention pond is engineered for one thing: slow water down. It stores peak runoff and releases it gradually, keeping the surrounding land from flooding. That function never changes, and neither does the surface area, which sits idle for every hour the sun shines.
So the engineering insight is simple. An idle water surface is also a stable, flat, temperature moderated platform for a photovoltaic array. Water cools the underside of floating panels in a way that concrete or asphalt never can, and the advantage can boost efficiency by up to 15 percent.
The catch is depth. At just ten feet, conventional pile anchoring into the pond bed was never realistic, so the array is anchored from the banks instead, with tensioned lines holding the island steady as water levels rise and fall with each storm.
The pond’s surface in close detail
That bank anchored design is the single biggest engineering constraint on the whole project. It dictates how the floats link together and how the array flexes when the water surface shifts beneath a tropical storm front.
The floats themselves draw from a modular pontoon platform that links individual units into one continuous island. Each float clips into its neighbors, so the whole array moves as a single piece on the water rather than as hundreds of independent rafts, which matters when wind loads push across open water.
The result is dense. Spread across about 2.5 acres, the panel count works out to roughly 1,350 panels per acre, tighter than a typical ground mount field because the pontoon system wastes almost no space between rows.
Where the numbers come from
The floating array was energized earlier this year and confirmed by Solar Power World as a 1.4 MW peak installation, one of three solar systems at the park that together reach 3.7 MW. The floating contractor that built it has deployed more than half of all operating floating solar systems in the United States, and this Orlando site is its second for the same resort campus.
The park expects the three installations to produce more than 6.7 million kWh of electricity each year, enough to power more than 900 homes. Power gathered by day is stored in batteries and discharged overnight to charge the park’s electric bus fleet, linking solar generation, storage and transportation into one closed loop.
The managing director of the floating solar contractor summed it up plainly: “We’re proud to continue our relationship with Universal Orlando through a second floating solar project.”
The complications the pond introduces
A retention pond at a theme park is not a remote reservoir. It sits within guest sight lines, carries stormwater that may include cleaning chemicals, and must stay accessible to maintenance crews without a service road around its edge.
Because there is no berm to drive on, access by inflatable tender becomes the standard method for inspecting connections and clearing fouling. Florida’s subtropical climate also breeds algae faster than the temperate European lakes where floating platforms were first tested, and while it will not harm the panels directly, it can coat the underside of floats and shift buoyancy, tilting units and cutting output.
Even so, the pond’s enclosed shape limits wave action to ripples rather than swells, protecting the clips and wiring between panels. That is exactly the kind of advantage a carport array found in its own unglamorous parking lot setting.
What the pond suggests for the next generation of sites
There are tens of thousands of stormwater ponds across the country, most already owned and maintained by municipalities or commercial properties. That makes floating solar a way to generate power without claiming new land, which matters where land near load centers is scarce and expensive.
This Orlando park became the first theme park to attain LEED Platinum certification under the standard for communities, and the floating array contributed by closing the loop: generation on the pond, storage in the battery bank, and consumption by the bus fleet overnight with no grid export required. This shallow Orlando pond proves the bank anchored design can work at the thin end of the depth range, not unlike how a grain belt solar park proved a design could work on unfamiliar terrain.
What remains unproven is long term performance through repeated Florida summers. An earlier, smaller array on the same Orlando campus has operated since 2021, with 645 panels covering about half an acre, and offers the closest available comparison. If its record holds, the case for retrofitting retention ponds everywhere gets measurably stronger, and the pond itself keeps doing exactly what it was built to do, catching rain, holding it, releasing it slowly, while now also generating power.
Hugo is an engineer with strong technical expertise. Multilingual from an early age, his writing combines technical clarity with a strong interest in science and energy.
