Pumped-storage hydroelectricity, or pumped hydroelectric energy storage, is a type of hydroelectric energy storage used by electric power systems for load balancing.

Run-of-river hydroelectricity or run-of-the-river hydroelectricity is a type of hydroelectric generation plant whereby little or no water storage is provided.

, hydroelectric power stations in the United Kingdom accounted for 1.87GW of installed electrical generating capacity, being 2.2% of the UK's total generating capacity and 4.2% of UK's renewable energy generating capacity.

Hydroelectricity is currently China's largest renewable energy source and the second overall after coal.

Italy is the world's 14th largest producer of hydroelectric power, with a total of 50,582 GWh produced in 2010.Compare List of countries by electricity production from renewable sources Electric energy from hydro accounted for about 18% of the national electricity production in 2010.

Hydroelectricity is the second most important renewable energy source after solar energy in Japan with an installed capacity of 50.0 gigawatt as of 2019.https://www.irena.org/-/media/Files/IRENA/Agency/Publication/2020/Mar/IRENA_RE_Capacity_Statistics_2020.pdf According to the International Hydropower Association Japan was the world's sixth largest producer of hydroelectricity in 2020.