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China is now home to the world’s largest floating solar power farm, a huge expanse of solar panels stretching across what was once a coal mining town in the central province of Anhui.
The farm connected to the grid last month, is thought to be the world’s largest in terms of capacity at 40 megawatts, providing enough electricity to power 15,000 homes.

It occupies more than 800,000 square meters in an area hit by flooding and subsidence due to coal mining, a problem many coal mining regions in China are plagued with. After the ground sank, residents moved away, an employee at Sungrow, the company behind the panels, told Reuters.

Proponents of water based solar panel farms say they have the advantage of being placed in areas that would not have been utilised for other purposes, as well as being less likely to overheat due to the cooling effect of the water.

The world’s largest floating solar power plant is now online in China. Built by Sungrow, a supplier of PV inverter systems, the 40MW plant is now afloat in water four to 10 meters deep, and successfully linked to Huainan, China’s grid. The placement was chosen in large part because the area was previously the location of coal mining operations; and, as a result, the water there is now mineralized and mostly useless. The lake itself was only formed after years of mining operations, the surrounding land collapsed and created a cavity that was filled with rainwater.

Floating solar plants are advantageous because they put otherwise useless water and land to good use, and the water naturally cools the system and the ambient temperatures, improving generation and limiting long-term damage from heat. They also avoid taking up space in densely populated regions, which is especially an issue in China; the country is currently home to more than 100 cities with populations of at least one million people each. Finally, the floating PV arrays, customized to work efficiently despite higher levels of humidity, prevent the evaporation of fresh water.

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Photo courtesy Sungrow Power