
The Okutataragi Pumped Storage Power Station (奥多々良木発電所, Okutataragi hatsudensho) is a large pumped-storage hydroelectric power station in Asago, in the Hyōgo Prefecture of Japan. With a total installed capacity of 1,932 megawatts (2,591,000 hp), it is one of the largest pumped-storage power stations. . The Kurokawa Reservoir, the upper reservoir, has a capacity of 33,387,000 cubic metres (27,067 acre⋅ft), a catchment area of 1,090,000 square metres (11,700,000 sq ft), and a reservoir surface area of 5.2 square. . • . The Tataragi Reservoir, the lower reservoir, has a capacity of 19,440,000 cubic metres (687,000,000 cu ft), a catchment area of 1,050,000 square metres (11,300,000 sq ft), and a reservoir surface area of 13.4 square kilometres (5.2 sq mi), and is held. . The Omarugawa Pumped Storage Power Station (: 小丸川発電所, : Omarugawa Hatsudensho) is a large power station in Kijo in the of , . With a total installed capacity of 1,200 megawatts (1,600,000 hp), it is one of the larg. [pdf]

Pumped-storage hydroelectricity (PSH), or pumped hydroelectric energy storage (PHES), is a type of used by for . A PSH system stores energy in the form of of water, pumped from a lower elevation to a higher elevation. Low-cost surplus off-peak electric power is typically used t. A pumped-storage hydroelectricity generally consists of two water reservoirs at different heights, connected with each other. At times of low electrical demand, excess generation capacity is used to pump water into the upper reservoir. [pdf]

In 2009, world pumped storage generating capacity was 104 , while other sources claim 127 GW, which comprises the vast majority of all types of utility grade electric storage. The had 38.3 GW net capacity (36.8% of world capacity) out of a total of 140 GW of hydropower and representing 5% of total net electrical capacity in the EU. had 25.5 GW net capacity (24.5%. In the Alps, where pumped storage was invented in the late 19th century, Switzerland opened a plant in 2022 called Nant de Drance that can deliver 900 megawatts for as long as 20 hours. [pdf]
Small and medium-sized pumped storage power stations are mainly used to store clean energy such as wind and solar energy. Pumped storage has the characteristics of flexible operation and low environmental pressure, so it is a mature energy storage method with high economy and large capacity .
The construction of early pumped storage power stations at home and abroad started from small and medium-sized power stations. In the 1960s, the construction of Hebei Gangnan small hybrid pumped storage power station with an installed capacity of only 11,000 kW filled the gap in China's pumped storage industry.
Pumped storage hydropower facilities use water and gravity to create and store renewable energy. Learn more about this energy storage technology and how it can help support the 100% clean energy grid the country—and the world—needs.
In 2021, the National Energy Administration made it clear in the Medium and Long Term Development Plan for Pumped Storage (2021–2035) that the construction of small and medium-sized pumped storage power stations should be planned according to local conditions in provinces with better resources.
Promoting the construction of flexible and decentralized small and medium-sized pumped storage power stations is conducive to implementing the dual‑carbon goal and improving regional new energy consumption capacity.
Compared to large-scale pumped-storage power stations, which take at least 10–15 years from planning to completion, small- and medium-sized pumped-storage power stations take only 3–5 years, with a shorter revenue cycle and greater investment attractiveness for SMEs (small and medium-size enterprises).
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