Reservoirs for water pumping and energy storage

What is pumped storage hydropower (PSH)?

Pumped storage hydropower (PSH) is a type of hydroelectric energy storage. It is a configuration of two water reservoirs at different elevations that can generate power as water moves down from one to the other (discharge), passing through a turbine. The system also requires power as it pumps water back into the upper reservoir (recharge).

What is the main source of energy for pumped hydropower storage?

Pumped hydropower storage uses the force of gravity to generate electricity using water that has been previously pumped from a lower source to an upper reservoir. The technology absorbs surplus energy at times of low demand and releases it when demand is high.

How does pumped hydropower storage work?

Pumped hydropower storage works by using the force of gravity to generate electricity. It absorbs surplus energy at times of low demand and releases it when demand is high. This is done by pumping water from a lower source to an upper reservoir and then allowing it to flow back down through a turbine to generate electricity.

What is hydropower with reservoirs?

Hydropower with reservoirs is the only form of renewable energy storage in wide commercial use today. Storing potential energy in water in a reservoir behind a hydropower plant is used for storing energy at multiple time horizons, ranging from hours to several years.

What is a closed-loop pumped storage hydropower system?

With closed-loop PSH, reservoirs are not connected to an outside body of water. Open-loop pumped storage hydropower systems connect a reservoir to a naturally flowing water feature via a tunnel, using a turbine/pump and generator/motor to move water and create electricity.

What is the energy storage capacity of a pumped hydro facility?

The energy storage capacity of a pumped hydro facility depends on the size of its two reservoirs. At times of high demand - and higher prices - the water is then released to drive a turbine in a powerhouse and supply electricity to the grid. The amount of power generated is linked to the size of the turbine.