Located within and above the scenic valley of the river Rheidol near Aberystwyth in Mid-Wales, the hydropower plant is made up of an interconnected group of reservoirs, dams, pipelines, aqueducts and power stations, and covers a total area of 162 square kilometres. The annual energy production is about 85 GWh – enough to power approximately 12,350 homes.
The upper reaches of the scheme are over 750 meters above sea level up in the remote Plynlimon mountain range. A series of aqueducts collects the water and channels it into the Nant-Y-Moch reserviour. Water flows from this reservoir to a power station at Dinas where it drives a 13,000 KW generator. From the power station, the water flows into Dinas reservior.
Dinas reservoir supplies water to the largest power station at Cwm Rheidol where there are two 20,500 KW generators. At Cwm Rheidol a further reservoir has been created to avoid large variations in the flow of water. This reservoir collects water that flows through the power station and releases it slowly through a 1,000 KW generator.