High Quality Content by WIKIPEDIA articles! As of 2012, hydroelectric power stations in the United Kingdom accounted for 1.65 GW of installed electrical generating capacity, being 1.8% of the UK`s total generating capacity and 18% of UK`s renewable energy generating capacity. This includes for conventional hydroelectric power stations and run-of-river schemes for which annual electricity production is approximately 5,000 GWh, being about 1.3% of the UK`s total electricity production. In addition, there are also pumped-storage hydroelectric power stations providing a further 2.8 GW of installed electrical generating capacity, and contributing up to 4,075 GWh of peak demand electricity annually.