Europe needs a great deal more solar to meet its climate targets, but good sites on land are getting harder to secure. Cities keep spreading, farmers want to hold on to their fields and conservation rules are putting large areas off limits. Against this difficult backdrop, developers are turning to water in search of space. Floating solar farms, installed on lakes, reservoirs and other bodies of water, can add capacity without taking up a single extra hectare of land, and they open a promising new front in Europe’s solar expansion.
Floating solar concept aims beyond reservoirs into rougher waters
Floating photovoltaics, or FPV, as the technology is known, could become an important part of Europe’s renewable energy mix, provided the right legislation, investment and technical progress come together. The wider solar market is already expanding steadily, driven by rising investment in renewables and by technical advances that make floating systems easier and cheaper to build.
More power from cooler modules
FPV makes use of water surfaces that would otherwise lie unused, so it adds renewable capacity without competing for farmland or building land. The water below cools the modules and raises their efficiency, which means floating arrays can generate more electricity than comparable ground-mounted plants under similar conditions. And by shading the water, the panels reduce evaporation and limit the growth of algae.
Hurdles on the water
But building on water brings its own costs and complications. Floating structures, anchoring systems and dedicated electrical infrastructure push installation costs above those of conventional solar plants, and maintenance is more demanding, since the equipment is permanently exposed to moisture and corrosion. Developers also need detailed environmental impact assessments to judge the effects on aquatic ecosystems and local flora, while the rules for using water surfaces and connecting to the grid vary considerably from one European country to the next.
Solar Investors Guide – Mounting on tricky terrain
Despite these hurdles, Europe’s floating solar market is expected to grow strongly in the coming years, as governments and energy companies invest in new renewable technologies. The Netherlands, France, Germany, Portugal, Italy and Spain are all developing larger FPV plants to broaden their energy mix, and the projects keep getting bigger. Les Ilots Blandin near Perthes in north-eastern France, which went into operation in 2025, has a capacity of 74.3 MW, almost all of it on floating platforms, while Slovenia’s state-owned utility HSE is planning a 140 MW plant at Družmirje.
In Belgium, TotalEnergies and Holcim opened a 31 MW floating plant on a former quarry in Obourg in March 2026, which supplies around 30 GWh a year to Holcim’s own industrial sites. Better technology should make projects like these safer and cheaper to maintain, and artificial intelligence, IoT monitoring and predictive maintenance are already helping operators run installations more efficiently.
Plain sailing ahead?
Costs, regulation and environmental questions still stand in the way of floating solar. Even so, flooded quarries and reservoirs that would otherwise sit idle give Europe a practical way to add capacity, and FPV looks set to play a steadily larger role in the energy transition. (Aditi Jaiswal/hcn)
