This is the most widely used form of renewable energy. The gravitation force of falling water is the key point in hydroelectricity generation. Small scale hydro or micro-hydro power has been an increasingly popular alternative energy source, especially in remote areas where other power sources are not viable. The hydro power sites have a few major environmental problems like water logging and siltation, Causes loss to biodiversity of fish population and other aquatic animals. It also displaces local people and creates problems of rehabilitation and related socio-economic problems.

Related Societies: International Hydropower Association (IHA) (International), National Hydropower Association.