What is the most used renewable energy source in the world?

Hydraulic

Hydraulic energy, or hydroelectricity, is the leading source of renewable energy used worldwide, thanks to its ability to produce large quantities of electricity reliably and sustainably. It works by converting the potential energy of water into electricity, usually through dams. This ancient yet still evolving technology plays a crucial role in the global energy transition by offering a clean alternative to fossil fuels. Hydroelectricity also contributes to water resource regulation and flood protection.