Llyn Stwlan - Blaenau Ffestiniog, Gwynedd, Wales, UK.
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N 52° 58.808 W 003° 59.316
30U E 433625 N 5870517
Llyn Stwlan is part of the Ffestiniog Power station. The dam has a total lengh of 373 meters and has a maximum height of 34 meters and a maximum thickness 4meters.
Waymark Code: WM8BQ5
Location: North Wales, United Kingdom
Date Posted: 03/08/2010
Views: 4
Commissioned in 1963, Ffestiniog Power Station was the UK's first major pumped storage power facility.
HEP power is generated by the water flowing from Llyn Stwlan to the bottom reservoir. Water is captured in Tan-y-Grisiau (bottom reservoir) and pumped back to Llyn Stwlan, usually overnight, to complete the cycle.
The Ffestiniog pumped storage scheme which dominates this character area was the first such in Britain: work began in 1957 and was completed in 1963. The upper reservoir was formed by enlarging Llyn Stwlan by a concreate dam, and the lower (1033ft below) was created by damming the Afon Ystradau near the satellite village of Tan-y-Grisiau. Two vertical shaftes inside Moelwyn link the two to allow the system to work.
More information on the power generation scheme can be found at:
www.fhc.co.uk/ffestiniog.htm
The exact date the dam was constructed is not mentioned on the web site but it would have been between 1957 and 1963.
Waterway where the dam is located: Streams coming off the Moelwyn Mountains
Main use of the Water Dam: Hydroelectric Power Production
Material used in the structure: Concrete
Height of Dam: 34 meters
Date built: 01/01/1960
Fishing Allowed: no
Motor Sports Allowed: no
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Visit Instructions:
Photo of the Dam and a description of your visit.