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    Floating PV FAQs

    Lake Owners/Co-Developers

    How does Floating PV benefit lake owners?You can actively advance your sustainability credentials. You can also benefit from long-term lease income on areas that previously only created costs. You can become the owner of the floating system, either by buying it or by hire purchase. The electricity can be used for your own consumption, enabling you to secure your energy costs for the long term and avoid possible CO2 taxes, or you can sell the electricity on to another company. Operators of hydroelectric power stations benefit from dual use of the reservoir to maximise energy production. At high solar irradiation, the floating solar park delivers electricity; at low irradiation or at night, the hydro technology delivers electricity. Furthermore, a Floating PV system will reduce evaporation from their reservoir, and the existing grid connection can be used, which lowers the cost of installation. A real win-win situation.
    What are the benefits of partnering with BayWa r.e.?With more than 30 years of experience in the field of renewables, we draw upon extensive know-how. We are a quality-orientated, full-service provider with a strong financial background. Our parent company BayWa AG generates an annual turnover of 16 billion euros.
    Does the system impact marine life or birds?We don’t expect any negative impact on fauna. At our first parks in the Netherlands, we can already see birds sitting on the system and resting just next to it. Qualitative and quantitative studies are currently under way.
    Is there any impact on water quality?We have not seen any negative impact on water quality. Qualitative and quantitative studies are currently under way. With the patent-registered Zim Float, developed together with Zimmermann, we allow maximum water movement beneath the system. We expect less algae build-up due to moderate shadows underneath the construction – certain types of algae require substantial light to grow, so a reduction of these varieties might result. Other varieties thrive in the shade, but we use a specific type of glass/glass modules in our system which let a lot of light through, so they only cast moderate shadows. We think this could create the ideal conditions for avoiding excessive growth of both kinds of algae.
    Are there any safety issues related to electricity on water?No. Our Floating PV systems fulfil all electrical regulations relating to the installation of electrical systems. We install a perfect grounding system to protect the system from any electrical failures. Our systems are reviewed and certified by the independent company VDE and are compliant with all electrical regulations and standards. We use the highest standard of cables and components, certified for use in water. Nevertheless, our cabling design is kept completely out of the water, hidden under the subconstruction of the floating boats, so that cables are protected from the sun and have only minimum contact with the water. This also guarantees the long life of the construction and easy maintenance.
    Is it possible to use the water for Floating PV and other purposes (e.g. recreational use) simultaneously?That would be possible in theory, but we are currently focusing primarily on bodies of water such as sand pits, coal mining areas and water storage facilities, which are not used for recreation or tourism. There are many unused areas of water that could assume a new function, making it unnecessary to use those with high recreational value or major visual impact, thus avoiding any conflict of interest with the current users.
    In which countries is BayWa r.e. installing Floating PV systems?At the moment we are focusing on the European market. But, as a global company, we are also looking for opportunities around the world, e.g. in the APAC region.
    Can the Floating PV system be removed from the lake?The substructure is similar to those we use for ground-mounted plants, and the floating pontoons are made of HDPE. This material has been used for many years in other offshore applications, such as harbours or floating platforms. The pontoons consist of two layers – an inner recyclable layer and an external layer with high UV persistence, resulting in a long-term quality. The pontoons are also designed to withstand ice in the event that the lake freezes. Snow and ice, fire, pressure and UV irradiation are all considered long before construction, and the anchoring concept is designed to adhere to all Eurocode safety factors.
    Durability/safety: what if the lake freezes?The substructure is similar to what we use in the ground-mounted parks, and the floating pontoons are made of HDPE. This material has been used for many years in other offshore applications, such as harbours or floating platforms. The pontoons are also designed to withstand forces from ice in the event the lake freezes. The snow and ice, fire, pressure and UV irradiation are studied long before the construction, and the anchoring concept is designed in consideration of all Eurocode safety factors.
    Is any space required on land?All inverters and transformers for our system float on the water, so there is no extra space required on land except for a small station to connect the park to the grid, and possibly a container for spare parts.
    Why can’t we build smaller than 2 MWp?Our 2 MWp blocks are electrically and mechanically designed, simulated and tested in standard blocks including the required inverter and transformer units. A modification or removal of some parts would make the system incomplete and more vulnerable to damage and failures. To maintain the high quality standards of BayWa r.e., we stick with these proven blocks.

    Banks/ Investors

    Is Floating PV a proven technology?Floating PV is not a new technology, only a new application of an existing technology. Our Floating PV systems fulfil all Eurocode standards and are certified by VDE. The system is based on the construction experience of BayWa r.e., who have installed more than 1 GWp. It is maintained by BayWa r.e.’s O&M unit and ensures investors a smooth operation over the lifetime of the project. Due to our position monitoring, we make sure to always determine the exact location of the Floating PV system, which further increases the safety. For those investing in Floating PV from BayWa r.e., the return, risk and administration are no different than when investing in ground-mounted projects, as all the particulars are handled by our experienced teams.
    What is the average lifespan of a Floating PV system?The floating parks are designed for more than 30 years – the same as ground-mounted parks.
    What are the advantages of Floating PV compared to rooftop and ground-mounted PV?Compared to ground-mounted parks, the big advantage is that no agricultural land is used, and the parks do not conflict with food production. Compared to rooftop systems, much bigger systems can be realised at lower LCOE (capex and opex). Furthermore, constructing and maintaining Floating PV plants bears lower risks for our employees than rooftop installations.
    Are there any disadvantages of Floating PV compared to rooftop and ground-mounted PV?We use the same solar panels and technical components. We guarantee reliable energy production and secure long-term yields. We experience even higher yields with a floating system, since the water works as a natural cooling system increasing the efficiency of the solar panels. Furthermore, the compact installation and the smart cabling results in very low electricity consumption.
    Who will operate and manage my Floating PV plant?The plant will be operated and managed by the experts of the BayWa r.e. O&M team, who have already gained experience from our initial floating projects in the Netherlands. Remote 24/7 monitoring is guaranteed from our control centre based in Munich.

    Municipalities

    How can you ensure the safety of the system and especially the safety of individuals using the water as a lake for swimming?Our Floating PV systems fulfil all electrical regulations relating to the installation of electrical systems. We install a perfect grounding system to protect the system from any electrical failures. Our systems are reviewed and certified by the independent company VDE and are compliant with all electrical regulations and standards. Furthermore, we focus on lakes that are not used for recreational purposes.
    What about visual impact and conflict with tourism?We are primarily looking at non-recreational waters, such as sand pits, coal mining areas and water storage facilities, which are not used for tourism. There are many unused waterbodies that could assume a new function, making it unnecessary to use those with high recreational value or major visual impact.

    Politics

    Are there any support schemes in place in Germany and other European countries?In Germany, there are currently no support schemes available. With some bodies of water it might be possible to participate in the EEG subsidy scheme, and discussions about “Innovationsaussschreibungen” (proposals for subsidising innovations) are ongoing. In the Netherlands, Floating PV is currently subsidised through the same tariffs as ground-mounted projects, but a new tariff might soon be introduced specifically for Floating PV.
    What needs to happen for Floating PV to move forward across Europe?Subsidisation or a lowering of prices for PV system components.
    What is the potential for Floating PV in Europe?According to a study by the World Bank, there is a potential of 204 GWp in Europe alone, if we use 10% of the man-made freshwater reservoirs. (Source: Where Sun Meets Water, Floating Solar Market Report, 2019 International Bank for Reconstruction and Development / The World Bank, page 57, Graph.)
    Is Floating PV compatible with existing (e.g. recreational) water usage? Is floating solar energy more expensive than ground-mounted PV?Floating PV is a very safe installation that does not cause harm to people.
    Is floating solar energy more expensive than ground-mounted PV?Floating PV is still more expensive than ground-mounted PV, but it also generates higher yields due to the cooling effect of the water, and costs are constantly dropping due to technical improvement.
    Are you able to build subsidy-free Floating PV?Subsidy-free Floating PV is not yet marketable, but we expect grid parity for Floating PV to come across Europe in the next few years.

    Contact

    DERE-Toni_Weigl-70x70.jpg
    Toni Weigl
    Project Manager Floating
    BayWa r.e. Solar Projects GmbH
    Contact