gbw - Cwm Dyli

Hydro-Electric Power station built in 1905 by the Porthmadog, Beddgelert and South Snowdon Railway (and the North Wales Power and Traction Co Ltd). This makes it the oldest power station in Britain, and probably one of the oldest grid connected HEP stations in the world. It was used to power the Telegraph Station built by Marconi at Waunfawr in 1912.
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It supplies power to the National Grid, and the single Francis turbine was upgraded to 10 MW in 1990. The water is from Llyn Llydaw some 1040 feet above the "Chapel in the Valley" and the penstocks are about 1.25 miles in length. There were originally 13 staff but none now as it is controlled remotely from Dolgarrog.