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The power station hidden inside a Welsh mountain
It鈥檚 known, locally, as Electric Mountain.
Engie鈥檚 hydroelectric station at Dinorwig in North Wales is built deep inside a mountain.
It鈥檚 called into service when the National Grid needs a surge in supply and can generate power within 10 seconds.
As part of the Cool Planet season, 成人快手 Radio 5 Live went behind the scenes at Europe鈥檚 largest pumped-storage hydroelectric power generator.
Film by Nick Garnett.
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