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Pumped-storage hydroelectricity (PSH), or pumped hydroelectric energy storage (PHES), is a type of hydroelectric energy storage used by electric power systems for load balancing. A PSH system stores energy in the form of gravitational potential energy of water, pumped from a lower elevation reservoir to a higher elevation.
Hydroelectricity, or hydroelectric power, is electricity generated from hydropower (water power). Hydropower supplies 15% of the world's electricity , almost 4,210 TWh in 2023, [ 1 ] which is more than all other renewable sources combined and also more than nuclear power . [ 2 ]
As of 2019, the five largest power stations in the world are conventional hydroelectric power stations with dams. [21] Hydroelectricity can also be used to store energy in the form of potential energy between two reservoirs at different heights with pumped-storage. Water is pumped uphill into reservoirs during periods of low demand to be ...
Mingtan Pumped-Storage Hydro Power Plant dam in Nantou, Taiwan As of 2023 [update] , pumped-storage hydroelectricity (PSH) was the largest form of grid energy storage globally, with an installed capacity of 181 GW , surpassing the combined capacity of utility-scale and behind-the-meter battery storage, which totaled approximately 88 GW.
The power station was originally operated by the North of Scotland Hydro-Electric Board, before being transferred to the South of Scotland Electricity Board. [12] It was owned by ScottishPower from the privatisation of Britain's electricity industry in 1990 until Drax Group purchased it along with other ScottishPower assets on 1 January 2019.
Construction on the power station, with an original capacity of 2,100 megawatts (2,800,000 hp), began in March 1977 and was completed in December 1985 at a cost of $1.6 billion, [6] [7] Voith-Siemens upgraded the six turbines between 2004 and 2009, increasing power generation to 500.5 MW and pumping power to 480 megawatts (640,000 hp) for each ...
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