Pumped storage hydropower is the most dominant form of energy storage on the electric grid today. It also plays an important role in bringing more renewable resources onto the grid. PSH can be characterized as open-loop or closed-loop. Open-loop PSH has an ongoing hydrologic connection to a natural body of water.
By storing excess energy during periods of low demand and releasing it during peak demand, PHS systems help balance the grid and prevent blackouts or power shortages. In the same way, pumped hydro storage enables the efficient integration of these variable energy sources by storing excess renewable energy and releasing it when needed.
Forms of PSH that are seawater-based, small-scale or based at former mining sites could potentially mitigate some of these impacts and enable PSH development in areas where it is not currently practical. Pumped storage hydropower stores energy and provides services for the electrical grid.
Pumped hydro storage systems can be classified based on their configuration and location: closed and open-loop systems. Closed-loop systems are not connected to natural bodies of water and use two artificial reservoirs.
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Pumped hydro storage systems consist of two main components: the upper and lower reservoirs, and the equipment used to move water between them, which includes pumps, turbines, and generators.
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