Llyn Brianne: Hydroelectric Power
The spillway of the dam is a notable tourist attraction when the reservoir is spilling.
The dam is the UK's tallest, standing at a height of 300 ft (91 m), and is the world's largest clay core dam.
In 1996 the reservoir spillway was increased by 1 metre in height and a hydro electric generating station was added at the base of the dam. When all three turbines are working, it generates 4.3 megawatts of electricity.