Ciel & Terre

Design, financing and operation of large-scale rooftop, ground-mount and floating solar PV systems

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Floating solar system Hydrelio©

Floating PV system



Our innovative floating solar platform Hydrelio© allows standard PV panels to be installed on large bodies of water such as drinking water reservoirs, quarry lakes, irrigation canals or remediation and tailing ponds.

A simple and affordable alternative to ground-mount solar systems, or our floating solar platform Hydrelio© is particularly well suitable for energy and water-intensive industries who cannot afford to waste either land or water.  Wineries, dairy farms, fish farms, mining companies, wastewater treatment plants, irrigation districts and water agencies are all examples of organizations who benefit from the synergy that our system creates between sun and water.

Thanks to the cooling effect of water on PV panels, our systems produce more energy than land-based systems of a similar size. By shielding the water from the sun's heat, our platforms also reduce water evaporation, increasing your return on investment.

Our innovative floating solar technology Hydrelio© has been put to the test and has a 30-year lifetime. Since February 2011, we have been operating a pilote project in the south of France to come up with a simple and efficient design that is both affordable and performant. We are now developing a 12 MW and a 4 MW floating solar system (building permits granted) that will power thousands of households in the south of France without taking up any valuable land. Three other floating solar projects representing a total of 31MW  are under permit review in France.

Check out the complete list of benefits our floating solar technology Hydrelio© delivers to our clients and contact us today to discuss your floating solar system needs.

Let's shine together!




Global diagram of a floating solar system



Conserve valuable land and turn unused and non-revenue generating bodies of water into profitable solar power plants

Floating solar panels protect ecologically-sensitive areas and conserve precious land for farming, mining, tourism and other land-intensives activities. Land-use conflicts are avoided and the environmental impact is minimized.

Increase power production and improve return on investment

PV Panels and marine cables installed on water stay cooler, generate more electricity and have a higher ROI than rooftop or ground-mount systems of the same size.


Minimize water evaporation, conserve water

By lowering the water temperature and reducing the size of the water area exposed to air, floating solar panels can reduce water evaporation by up to 33% on natural lakes and ponds, and by up to 50% on man-made facilities.


Improve water quality and cut maintenance costs

By shading the water, our floating solar panel help reduce algae growth. Ciel et Terre's floating solar system can also be outfitted with solar-powered aerators/circulators that oxygenate the water and reduce organic pollution naturally. Our solutions minimize the need for harsh chemicals and reduce maintenance costs.


Preserve existing ecosystems

No excavation work or concrete foundations are necessary to install our floating solar platforms. Indeed, Ciel et Terre's floating solar systems are 100% recyclable and are easy to dismantle. Made of HDPE plastic, they can safely be installed on drinking water reservoirs.



Tested by ONERA (the French aerospace lab), our floating solar technology Hydrelio© can withstand up to 118 mph winds and changes in water levels of up to 20 feet. Link resistance is 3 000 DaN (equivalent to 3 tons) and our HDPE floats are UV and corrosion-resistant and more durable than metallic structures.


  • Streamlined manufacturing process to ensure competitive prices
  • Systems can be manufactured locally to reduce shipping time and costs
  • Platforms assembled on ground for ease and rapidity of assembly and installation
  • Solutions adapted to any electrical configurations


Patented Technology

  • 7 patents on our floating technology Hydrelio© have been registered in Europe. International patent is pending.



Ciel & Terre offers a large range of services

  • Site selection
  • Irradiance and feasibility studies
  • Complete project design and development
  • Engineering, Procurement and Construction (EPC)
  • Project Financing
  • System Operation & Maintenance (O&M)

Download the Services presentation brochure (.pdf)





Logo AquagoFor 15 years, Aquago, a TECHSUB subsidiary, has been the worldwide leader in natural wastewater treatment  and pollution reduction solutions. Aquago develops and integrates the latest technologies and partipates in national and international research programs.  SUNGO, its patented solar aerator/ciculator, offers a clean and efficient  solution to oxygenate and treat polluted lagoons.


Sungo is designed to mix eutrophic waters at a speed of 9 m3/s to increase oxygen concentration and promote biodiversity.


Combining Ciel et Terre’s floating solar system with Aquago’s technology provides large-scale renewable energy generation and natural water treatment on bodies of water of almost any size.