Cruachan Dam

Cruachan Dam
Country	Scotland
Location	Argyll and Bute
Coordinates	56°24′23″N 05°06′47″W / 56.40639°N 5.11306°W / 56.40639; -5.11306Coordinates: 56°24′23″N 05°06′47″W / 56.40639°N 5.11306°W / 56.40639; -5.11306
Status	Operational
Construction began	1960s
Commission date	1966
Owner(s)	Scottish Power
Reservoir information
Upper reservoir	Cruachan Reservoir
Lower reservoir	Loch Awe
Pumped-storage station information
Pump-generators	4
Power generation information
Installed capacity	440 MW

The Cruachan Dam (also known as Ben Cruachan Dam, Cruachan Power Station or Ben Cruachan Power Station) is a pumped-storage hydroelectric dam and power station in Argyll and Bute, Scotland.

The power station was built in the early 1960s, and has been operational since 1966. It was originally operated by the Hydro-electric Board, but has been owned by Scottish Power since the privatisation of Britain's electricity industry in 1990.

Water is pumped from Loch Awe to the upper reservoir, 360 m above, during periods of low energy use (such as at night). A 316 m-long dam forms this reservoir. Additionally the upper reservoir receives rainwater; tunnels have been built through Ben Cruachan to catch rain coming from all sides of the mountain. Around 10 % of the energy from the station is generated from rainwater; the rest is from the water pumped up from Loch Awe.

The station is capable of generating 440 MW of electricity. It can go from standby to full production in two minutes, thus it is used to deal with periods of peak demand on the grid. If the turbines are on "spinning reserve" (turning in air, awaiting the rush of water) full output can be achieved within 30 seconds. It can operate for 22 hours before the supply of water in the top reservoir is exhausted. The power station is required to keep a 12 hour emergency supply; this is referred to as a Black Start.

There are four turbines, which operate both as pumps and generators. These are housed in a cavern located within Ben Cruachan. The excavation of this cavern required the removal of 220,002 m³ of rock and soil.

The power station was listed by the conservation organisation DoCoMoMo as one of the sixty key monuments of post-war Scottish architecture. There is a visitor centre at the outflow to Loch Awe, and tours of the tunnels are available for visitors.

The dam features in Danny MacAskill's bike trials video, "Way Back Home", released in 2010.

See also

• Ben Cruachan
• List of power stations in Scotland

External links

• Scottish Power page about Cruachan power station