Hydropower, or hydroelectric power, is one of the oldest and largest sources of renewable energy, which uses the natural flow of moving water to generate electricity.
In 2020, hydropower supplied one-sixth of global electricity generation, making it the single largest source of low-carbon power – and more than all other renewables combined.
Hydropower today has a key role in the transition to clean energy not only through the massive quantities of low-carbon electricity it produces but also because of its unmatched capabilities for providing flexibility and storage.
Many hydropower plants can ramp their electricity generation up and down very rapidly compared with other power plants such as nuclear, coal, and natural gas.