Coo-Trois-Ponts Hydroelectric Power Station, Pumped-storage power station in Trois-Ponts, Belgium

Coo-Trois-Ponts Hydroelectric Power Station is a pumped-storage facility in Trois-Ponts, Belgium. It consists of two reservoirs at different elevations, connected by underground tunnels and a powerhouse that houses the pump-turbine units.

The station was built in the 1960s and expanded in the 1970s to help meet Belgium's growing electricity demand. It was designed to store excess energy from nuclear and coal plants by pumping water uphill at night.

The lower reservoir, known as the Bassin de Coo, is a familiar landmark for locals and a popular spot for walks and picnics. Its artificial lake and the nearby abbey ruins of Stavelot add a layer of human history to the landscape.

The site is best viewed from the surrounding roads and trails, as access to the inner workings is restricted. Visitors should wear sturdy shoes if hiking in the area, and be aware that the terrain is hilly.

The station can switch from pumping to generating in a matter of minutes, acting like a giant battery for the grid. The upper reservoir, called Bassin de Ry de Coo, sits on a plateau and offers views over the Amblève valley.