Pumped-storage hydroelectricity is the only economical, flexible way of storing large amounts of energy


To guarantee the stability of electrical networks, it’s becoming increasingly important to manage the balance between energy production and consumption levels.

Pumped-storage hydroelectricity is the only economical, flexible way of storing large amounts of energy, giving power plants the versatility needed to manage the balancing act between production and consumption.

Hydro pumped storage power plant

In a pumped-storage plant, pump turbines transfer water to a high storage reservoir during off-peak hours. The stored water can later be used to generate electricity to cover temporary peaks in demand from consumers or unplanned outages at other power plants.

The energy used for pumping the water comes from other energy sources, including nuclear, fossil and intermittent renewables, that are less efficient to adapt to load fluctuations.

  • Huizhou - 2007, Baoquan - 2007 and Bailianhe - (China)
    3 pumped-storage plants
    16 x 306 MW turbine/generator units, BOP (balance of plant), and control systems

  • Alqueva (Portugal), 2012
    4 x 130 MW turbine/generator units, and control system

  • New Tyin (Norway), 2004
    2 x 220 MA generators, BOP (balance of plant), and control system

  • Nant de Drance (Switzerland), 2017*
    6x157 MW pump turbines, 6x170 MVA vertical asynchronous motor/generator units, full site delivery, erection, supervision and commissioning.

* Estimated date of commercial operation

Hydropower solutions

Alstom hydro turbines and generators installed worldwide represent more than 25% of the total hydro power capacity today. We have the broadest range of hydro solutions and services: from water to wire, from individual equipment to complete turnkey solutions, for new plants and the installed base.

Hydropower