A hydro plant with a capacity of 88.85 megawatts (MW) in the form of a reversible pumping station with three sets consisting of an alternator, a turbine and a pump. It can supply clean energy to more than 16,000 homes. It has two reservoirs to complete the pump-turbine circuit. The higher reservoir is a lake (the Lake of Ip) whose level has been raised through infilling with loose materials to a maximum height above foundations of 28m, a crown length of 235m and a spillway capacity of 87 m3/s. It has a capacity of 5.3 hm3 (Lake of Ip). The lower reservoir (the Canfranc counter-reservoir) has a capacity of 0.43 hm3. It has a 32.2-meter-high buttressed-wall dam located on the river Aragon.