Hydro dams are the world"s largest renewable energy source. But in some areas of the world, such as Africa, increasing droughts caused by climate change could threaten their future potential, the International Energy Agency has warned.  One study found that solar panels floating on just 1% of Africa"s hydropower reservoirs could double the continent"s hydropower capacity and increase electricity generation from dams by 58%. There is "strong potential" for an installation such as Proteus to be used in combination with existing hydropower infrastructure to boost electricity generation, says Duarte.