Floating solar or floating photovoltaics (FPV), sometimes called floatovoltaics, are solar panels mounted on a structure that floats. The structures that hold the panels usually consist of plastic buoys and cables. They are then placed on a body of water. Typically, these bodies of water are reservoirs, quarry lakes, irrigation canals or remediation and tailing ponds. [1] [2] [3] [4] [5]
The systems can have advantages over photovoltaics (PV) on land. Water surfaces may be less expensive than the cost of land, and there are fewer rules and regulations for structures built on bodies of water not used for recreation. Life cycle analysis indicates that foam-based FPV [6] have some of the shortest energy payback times (1.3 years) and the lowest greenhouse gas emissions to energy ratio (11 kg CO2 eq/MWh) in crystalline silicon solar photovoltaic technologies reported. [7]
Floating arrays can achieve higher efficiencies than PV panels on land because water cools the panels. The panels can have a special coating to prevent rust or corrosion. [8] Floating SPV also provide shade, slow evaporation and inhibit the growth of algae. [9]
The market for this renewable energy technology has grown rapidly since 2016. The first 20 plants with capacities of a few dozen kWp were built between 2007 and 2013. [10] Installed power grew from 3 GW in 2020, to 13 GW in 2022, [11] surpassing a prediction of 10 GW by 2025. [12] The World Bank estimated there are 6,600 large bodies of water suitable for floating solar, with a technical capacity of over 4,000 GW if 10% of their surfaces were covered with panels. [11]
The U.S. has more floating solar potential than any other country in the world. [13] Bodies of water suitable for floating solar are well-distributed throughout the U.S. The southeast and southern U.S. plains states generally have reservoirs with the largest capacities. [13]
American, Danish, French, Italian and Japanese nationals were the first to register patents for floating solar. In Italy the first registered patent regarding PV modules on water was issued in February 2008. [15]
The first floating solar installation was in Aichi, Japan, in 2007, built by the National Institute of Advanced Industrial Science and Technology. [10] [16]
In May 2008, the Far Niente Winery in Oakville, California, installed 994 modules (175 kW) on 130 pontoons on its irrigation pond. [10] [17] Several small-scale floating PV farms were built over the next seven years. The first megawatt-scale plant was commissioned in July 2013 at Okegawa, Japan.[ citation needed ]
The Solar Energy Industries Association (SEIA) and GTM Research (later acquired by Wood Mackenzie) [18] reported that 7.3 megawatts of SPV was installed in the U.S. during 2015. [19]
In 2016, Kyocera developed what was then the world's largest, a 13.4 MW farm on the reservoir above Yamakura Dam in Chiba Prefecture [20] using 50,000 panels. [21] [22] The Huainan plant, inaugurated in May 2017 in China, occupies more than 800000 m2 on a former quarry lake, capable of producing up to 40 MW. [23]
That same year, in the UK, which claims the largest floating array in Europe at its Queen Elizabeth II Reservoir in Walton-on-Thames; [24] MP Alan Whitehead stated to CNBC that solar power was becoming central to his country's power production. [25]
Global installed capacity grew from 1 GW in 2018 to 13 GW in 2022, mostly in Asia. [11] By 2020, costs associated with floating and land-based solar had narrowed to near parity. [25]
In 2022, China added the largest floating PV plant in the world, Huaneng Power International (HPI), a 320 MW facility in Dezhou, Shandong, expected to produce around 150 GWh annually. [26] In 2023, global solar capacity grew by 22%, reaching 1,200 GW. [27]
Floating panels rise in popularity during the 2020s can be attributed to its increased energy yield and efficiency, when compared to land-based systems, [28] especially in countries where land costs and environmental impact legislation hinders development.[ citation needed ]
C.J. et al. 2024 reported that FPVs generate 0.6% to 4.4% more energy and deliver efficiency improvements ranging from 0.1% to 4.45% over its mounted solar installations. [28]
In 2024, FPV installations withstood both Typhoon Yagi when, strengthened into Super Typhoon Capricorn, it struck Zhanjiang, Guangdong, China, [29] and Hurricane Milton in the US . [30] D3Energy's 10 floating installations along the path of the storm were undamaged, whereas mounted panels in Florida were widely damaged by the hurricane. [31]
Global Industry Analysts (GIA) forecast a compounded annual growth rate (CAGR) of 33.7% in FPVs by 2026. [26] The FPV market is expected to grow into a $10 billion industry by 2030, with a CAGR of 14.5%. [27]
Oceans of Energy (Netherlands) developed the world's first offshore solar system in the North Sea. [32] In October 2025, Germany inaugurated the first vertical floating photovoltaic (VFPV) plant on a former gravel pit lake in Bavaria.
Salt-water resistant floating farms are constructed for ocean use. [33] [34] Floating solar can have positive and negative effects on the ocean environment: for instance, it can act as an artificial reef and provide habitat for fish and other animals. On the other hand, the panels increase shading and construction may disrupt seagrass and coral. [35]
FPV systems are increasingly installed on lakes, reservoirs, and canals as an alternative to land-based solar installations. These systems save land, maintain higher panel efficiency due to water cooling, and reduce sun-driven evaporation. FPVs can be installed on artificial lakes, irrigation basins, and reservoirs, and are particularly suitable for locations near towns that are not in protected areas and that do not dry up or freeze for long periods. [36]
An international study estimated the global potential of FPV on lakes and reservoirs. Out of more than 1 million water bodies larger than 0.1 km2, 67,893 sites met the criteria for implementation. Assuming 10% coverage of these water surfaces, floating photovoltaics could generate approximately 1,302 TWh per year worldwide. Major potential contributors are China (252 TWh), Brazil (170 TWh), and the US (153 TWh). In smaller countries such as Papua New Guinea, Ethiopia, and Rwanda, FPV could satisfy most electricity demand. Bolivia and Tonga could meet 87% and 92% of demand, respectively. In Europe, Finland and Denmark show the highest potential, with 17% and 7% of electricity demand coverage, respectively. [36]
Floating solar on Federally owned reservoirs in the US has the potential to generate 1,476 terawatt hours annually. [38] [39] The shading from floating solar could help mitigate evaporation from reservoirs also. [40]
The construction process for a floating solar project includes installing anchors and mooring lines that attach to the waterbed or shore, assembling floats and panels into rows and sections onshore, and then pulling the sections by boat to the mooring lines and secured into place. [41] [42]
While overall costs for a floating system neared parity ground-mounted systems by 2020, [25] installation was about 10-25% higher in 2023. [43] [44] [41] According to a researcher at the National Renewable Energy Laboratory (NREL), this increase is primarily due to the need for anchoring systems to secure the panels on water. [45]
Vertical floating photovoltaics (VFPV) place panels vertically. A project developed by SINN Power uses 2,600 vertically mounted bifacial modules in an east–west orientation, with corridors of at least four meters between rows. The installation features a keel-based substructure that extends up to 1.6 meters below the surface, secured to a network of cables, allowing controlled movement under wind pressure while maintaining stability with changing water levels. [46]
The VFPV system produces electricity that better matches daily consumption peaks, generating more energy in the morning and late afternoon. Seasonal data indicate that vertical bifacial modules can improve energy yield by 7–10% on average and up to 27% during early morning and late afternoon hours. The plant is expected to generate around 2 GWh per year, with neutral to positive ecological effects, shown by nearby nesting waterfowl and fish. [46]
Several factors support this approach:
Floating solar presents several challenges to designers: [67] [68] [69] [70]
| PV power station | Location | Country | Nominal Power [76] (MWp) | Year | Notes |
|---|---|---|---|---|---|
| Anhui Fuyang Southern Wind-solar-storage | Fuyang, Anhui | China | 650 | 2023 | [ citation needed ] |
| Wenzhou Taihan | Wenzhou, Zhejiang | China | 550 | 2021 | [77] |
| Chang-Bin | Changhua | Taiwan | 440 | [44] [78] [79] | |
| Dezhou Dingzhuang | Dezhou, Shandong | China | 320 | +100 MW windpower [80] [81] | |
| Cirata | Purwakarta, West Java | Indonesia | 192 | 2023 | +1000 MW hydroelectricity [82] |
| Three Gorges | Huainan City, Anhui | China | 150 | 2019 | [81] [83] |
| NTPC Ramagundam (BHEL) | Peddapalli, Telangana | India | 145 | ||
| Xinji Huainan | Xinji Huainan | China | 102 | 2017 | [83] |
| Yuanjiang Yiyang | Yiyang, Hunan | China | 100 | 2019 | [83] |
| NTPC Kayamkulam | Kayamkulam, Kerala | India | 92 | [44] | |
| Omkareshwar Floating Solar Power Park | Khandwa, Madhya Pradesh | India | 90 | 2024 | [84] |
| Les Îlots Blandin | Perthes, Haute-Marne | France | 74 | 2025 | [85] |
| CECEP | Suzhou, Anhui | China | 70 | 2019 | [81] [86] |
| Tengeh | Singapore | 60 | 2021 | [81] [87] [88] | |
| 304 Industrial Park | Prachinburi | Thailand | 60 | 2023 | [89] |
| Huancheng Jining | Huancheng Jining | China | 50 | 2018 | [83] |
| Da Mi Reservoir | Binh Thuan province | Vietnam | 47.5 | 2019 | [90] |
| Sirindhorn Dam | Ubon Ratchathani | Thailand | 45 | 2021 | [91] [92] |
| Hapcheon Dam | South Gyeongsang | South Korea | 40 | [93] | |
| Anhui GCL | China | 32 | [94] | ||
| HaBonim Reservoir | Ma'ayan Tzvi | Israel | 31 | 2023 | [95] |
| NTPC Simhadri (BHEL) | Vizag, Andhra Pradesh | India | 25 | ||
| Ubol Ratana Dam | Khon Kaen | Thailand | 24 | 2024 | [96] |
| NTPC Kayamkulam (BHEL) | Kayamkulam, Kerala | India | 22 | [97] | |
| Former sand pit site | Grafenwörth | Austria | 24.5 | 2023 | [98] |
| Qintang Guigang | Guping Guangxi | China | 20 | 2016 | [83] |
| Lazer | Hautes-Alpes | France | 20 | 2023 | [99] |
| Burgata | Israel | 13.5 | 2022 | [100] | |
| NJAW Canoe Brook | Millburn, New Jersey | US A | 8.9 | 2022 | [101] [102] |
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