Qualla: Ffestiniog Power Station https://qualla.com/ffestiniog-power-station en-us © 2026 Bendyline Wed, 08 Jul 2026 02:40:14 GMT Qualla serial false Qualla support@bendyline.com yes https://qualla.com/_m/g/c/m/j/ffestiniog-power-station-wp/hero-small.webp Qualla: Ffestiniog Power Station https://qualla.com/ffestiniog-power-station Ffestiniog Power Station: Introduction https://qualla.com/ffestiniog-power-station/ Photo credit Public domain. There is a particular moment, just after a popular television programme ends, when millions of British kettles switch on simultaneously and the national grid lurches. To absorb that surge, engineers in the 1950s went looking for a mountain. They found Llyn Stwlan, a glacial lake suspended in a cirque high above the Vale of Ffestiniog, and they used it to build the United Kingdom's first major pumped-storage power station. Commissioned in 1963, Ffestiniog can deliver 360 megawatts to the grid in under a minute - enough to keep the lights on across North Wales for hours.

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Image: Public domain

]]> Sun, 24 May 2026 00:00:00 GMT https://qualla.com/_m/g/c/m/j/ffestiniog-power-station-wp/gcmj-ffestiniog-power-station-intro.mp3 0:06 1 full Ffestiniog Power Station: A Mountain as a Battery https://qualla.com/ffestiniog-power-station/ Photo credit James@hopgrove at English Wikipedia, Public domain. The principle is elegantly simple. Two reservoirs sit at different elevations: Llyn Stwlan in its glacier-carved bowl on Moelwyn Mawr, and Tanygrisiau Reservoir down in the valley. When the grid has surplus power overnight, pumps push water uphill, lifting it back into Stwlan aga...

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Image: James@hopgrove at English Wikipedia | Public domain

]]> Sun, 24 May 2026 00:00:00 GMT https://qualla.com/_m/g/c/m/j/ffestiniog-power-station-wp/gcmj-ffestiniog-power-station-a-mountain-as-a-battery.mp3 0:06 2 full Ffestiniog Power Station: Engineered to Disappear https://qualla.com/ffestiniog-power-station/ Photo credit Ijanderson977, Public domain. The North Wales Hydro-Electric Power Act of 1955 carried something unusual for its time: an amenity clause. The Central Electricity Generating Board was required to engage a landscape consultant from the very beginning, working with the National Parks Commission to fold the stati...

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Image: Ijanderson977 | Public domain

]]> Sun, 24 May 2026 00:00:00 GMT https://qualla.com/_m/g/c/m/j/ffestiniog-power-station-wp/gcmj-ffestiniog-power-station-engineered-to-disappear.mp3 0:06 3 full Ffestiniog Power Station: The Longest Lawsuit https://qualla.com/ffestiniog-power-station/ Photo credit David Jones from Isle of Wight, United Kingdom, CC BY 2.0. There was a casualty. Building the lower reservoir meant flooding a mile of the Ffestiniog Railway and the northern portal of its Moelwyn Tunnel. Restoration of the railway as a tourist line had only just begun in 1952, and dismissive officials wrote the volunteers off as old gen...

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Image: David Jones from Isle of Wight, United Kingdom | CC BY 2.0

]]> Sun, 24 May 2026 00:00:00 GMT https://qualla.com/_m/g/c/m/j/ffestiniog-power-station-wp/gcmj-ffestiniog-power-station-the-longest-lawsuit.mp3 0:06 4 full Ffestiniog Power Station: Explosives Under the Mountain https://qualla.com/ffestiniog-power-station/ Photo credit Nilfanion, CC BY-SA 4.0. There is a stranger chapter still. After the Second World War, the disused Croesor slate quarry on the far side of Moelwyn Mawr was leased to Cookes Explosives of Penrhyndeudraeth, who used its underground chambers to store propellants. In 1971 the CEGB realised that a detonation...

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Image: Nilfanion | CC BY-SA 4.0

]]> Sun, 24 May 2026 00:00:00 GMT https://qualla.com/_m/g/c/m/j/ffestiniog-power-station-wp/gcmj-ffestiniog-power-station-explosives-under-the-mountain.mp3 0:06 5 full Ffestiniog Power Station: A Quiet Engine of the Grid https://qualla.com/ffestiniog-power-station/ Photo credit SchmalspurDVZO, CC BY-SA 4.0. From the air, the power station scarcely declares itself. The valley still looks like an upland sheep landscape with two unusually clean lakes. Down in the engine hall, four vertical shafts run several storeys below the operating floor; the building extends as far down into the g...

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Image: SchmalspurDVZO | CC BY-SA 4.0

]]> Sun, 24 May 2026 00:00:00 GMT https://qualla.com/_m/g/c/m/j/ffestiniog-power-station-wp/gcmj-ffestiniog-power-station-a-quiet-engine-of-the-grid.mp3 0:06 6 full