Pumped storage


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Pumped storage

A process, also known as hydroelectric storage, for converting large quantities of electrical energy to potential energy by pumping water to a higher elevation, where it can be stored indefinitely and then released to pass through hydraulic turbines and generate electrical energy. An indirect process is necessary because electrical energy cannot be stored effectively in large quantities. Storage is desirable, as the consumption of electricity is highly variable between day and night, between weekday and weekend, as well as among seasons. Consequently, much of the generating equipment needed to meet the greatest daytime load is unused or lightly loaded at night or on weekends. During those times the excess capability can be used to generate energy for pumping, hence the necessity for storage.

A typical pumped-storage development is composed of two reservoirs of essentially equal volume situated to maximize the difference in their levels. These reservoirs are connected by a system of waterways along which a pumping-generating station is located (see illustration). Under favorable geological conditions, the station will be located underground, otherwise it will be situated on the lower reservoir. The principal equipment of the station is the pumping-generating unit. In United States practice, the machinery is reversible and is used for both pumping and generating; it is designed to function as a motor and pump in one direction of rotation and as a turbine and generator in opposite rotation. See Electric power generation, Pumping machinery

References in periodicals archive ?
At the pumped storage hydro plants, after the flowing water from Sun Moon Lake is used to make electricity, the water is stored in lower pools and then pumped back to the lake, which can cause the water levels of the lake to fluctuate by as much as two meters, the agency said.
Israeli based renewable energy company Ellomay Capital (NYSE MKT:ELLO) (TASE:ELLO) reported on Wednesday that it has received a conditional license for its Manara Ellomay Pumped Storage (2014) (Ellomay PS) from the Israeli Minister of National Infrastructures, Energy and Water Resources.
Shire Oak Energy are looking to develop pumped storage sites around the UK and have identified Llanddulas Landfill Quarry as a potential location.
121) Pumped storage has bulk storage potential, which is a relatively
Pacific Gas and Electric Company, a subsidiary of PG&E Corporation (NYSE: PCG), is commemorating the 30th anniversary of the commercial operation at Helms Pumped Storage Project during the month of August.
The USD258m deal size refers to the price for the 51% stake in Hong Kong Pumped Storage Development Co Ltd.
Pumped storage was first used in Italy and Switzerland in the 1890s, but it was not until the 1930s that reversible hydroelectric turbines were developed.
Prof David MacKay, chief scientist at the Department of Energy and Climate Change used a speech to the Institute of Mechanical Engineers last week to argue in favour of combining wind farms and pumped storage stations to help meet the UK's and, in particular, England's, renewable energy needs.
The European Investment Bank (EIB) granted, on 10 February, a 300 million loan over a period of 15 years to Energias de Portugal SA (EDP) for the re-powering of two existing pumped storage hydropower plants, the Alqueva plant on the Guadiana River in South-East Portugal and the Venda Nova plant on the Cavado River in the North of the country.
com)-- A consortium headed by Electric Power Research Institute (EPRI) has been selected by the Department of Energy (DOE) to develop new methods to quantify and maximize the benefits that conventional hydropower and pumped storage hydropower provide to transmission grids.
ThyssenKrupp Steel Europe AG is supplying 17,000 metric tons of high-strength, quenched and tempered plate to the Ingula pumped storage scheme project of the South African power utility Eskom.
Pumped storage plants have become an effective way for some utility companies that derive power from hydroelectric facilities to economically store baseload energy during off-peak hours for use during peak hourly demands.