Before dawn, black-crowned night herons settle onto floating solar panels still cool from the night air. As daylight comes, double-crested cormorants jostle for position across the same structure.
Scenes like these are playing out at floatovoltaic sites worldwide — a fast-growing technology installed over irrigation ponds, reservoirs, and wastewater treatment plants to generate clean energy without consuming land. Scientists are only beginning to understand what the rapid spread of these systems means for the waterbirds that already call those waters home.
A technology on the rise
Floatovoltaics — floating photovoltaic systems — are exactly what they sound like: solar panels mounted on buoyant structures anchored over water rather than installed on land. They’ve moved from novelty to mainstream fast, spreading from a small California winery to massive energy projects in China and beyond.
The core appeal is straightforward: clean electricity without consuming farmland, forests, or other natural terrain. The panels also shade the surface beneath them, reducing water evaporation — a meaningful benefit for irrigation ponds and reservoirs in drought-prone regions.
Where clean energy meets wildlife
Water and birds go together. That simple fact makes waterbirds the obvious starting point when researchers ask ecological questions about floatovoltaics. Unlike many species, waterbirds interact both above and below floating panels, and they’re relatively easy to observe — which makes them practical subjects for field study.
The stakes are real. Bird populations globally face mounting pressure from habitat loss, climate change, pollution, and avian influenza, and many are already in decline. Introducing a large, novel structure into aquatic environments they depend on could help or harm them. Until recently, nobody had looked closely enough to know which.
That knowledge gap is striking given how quickly FPV deployment has grown. The UC Davis paper, published in Nature Water, is among the first to systematically outline what researchers need to understand about the relationship between floating solar and waterbirds.
What scientists actually saw in the field
The UC Davis Wild Energy Center team didn’t work from models alone — they went to FPV sites and watched. What they documented was varied and telling.
Black-crowned night herons rested on floating structures before dawn, using the panels as elevated perches. Double-crested cormorants competed for favorable spots across the same infrastructure. Black phoebes — small flycatchers — went further still, nesting under the panels themselves.
“Our team has been documenting such a diversity of bird behavior with floating PV, so we immediately knew this was a very important interaction, especially given the precipitous decline in waterbird numbers globally,” said senior author and UC Davis Professor Rebecca R. Hernandez.
The early picture is largely encouraging: birds appear to actively use FPV infrastructure rather than avoid it. Some site operators, though, have already responded to bird presence with deterrence measures — a sign that practical tensions exist and that clearer, evidence-based guidance is needed soon.
Five questions researchers say must be answered
The Nature Water paper doesn’t just report observations — it maps out a research agenda. The team identified five priorities for future study.
First, how do waterbirds interact with each distinct component of FPV infrastructure? Second, what direct and indirect effects do birds and floating solar systems have on each other? Third, how might conservation strategies need to vary by site, region, or season? Fourth, what monitoring methods work best at these installations? Fifth, could materials in floating solar infrastructure leach pollutants into the water, and how can that risk be managed?
The timing of this agenda matters. “While we’re at this critical threshold of renewable energy development, we want to put more thought into the design that can benefit birds and other wildlife as we go forward,” said coauthor Emma Forester, a Ph.D. candidate at UC Davis.
Corresponding author Elliott Steele put the stakes plainly: understanding wildlife response now allows negative impacts to be avoided and potential ecological benefits to be realized — before large-scale deployment locks in designs that are hard to change.
Designing for both energy and ecology
The researchers aren’t arguing against floatovoltaics. They’re arguing for doing them well. Co-benefits already observed — farms saving water, generating clean power, and keeping cropland intact — suggest the technology can serve multiple goals at once.
Their broader aim, as Steele put it, is to “advance clean energy while promoting healthy, functional environments.” That framing echoes lessons from earlier renewable energy rollouts, where ecological considerations arrived too late to shape foundational design choices.
With floatovoltaics, that window is still open. As installations multiply across continents, researchers have a rare opportunity to build ecological thinking into the technology from the start — and the herons settling onto those panels before dawn may be the clearest signal yet that the natural world isn’t waiting for an invitation.
Carlos is an engineer with strong expertise in technical and industrial topics. He previously worked at international companies such as Siemens and speaks Spanish, German, English, and Italian.
