Cruachan Power Station, pumped storage hydroelectric power station in Argyll and Bute, Scotland UK
Cruachan Power Station is a pumped-storage hydroelectric plant built inside Ben Cruachan, a mountain in Argyll and Bute, Scotland. It uses two reservoirs at different heights, releasing water downward to generate electricity when demand is high and pumping it back up when demand is low.
Construction began in the early 1960s, when Britain was looking for new ways to store and manage electricity across the national grid. The project was completed in 1965 and became the first facility of its kind to operate in the country.
The name Cruachan comes from the Gaelic word for the mountain that towers over the site, Ben Cruachan, which also features in an old clan battle cry. Visitors entering the underground complex often remark on how the rock walls of the cavern feel like part of the mountain itself.
The site is in a remote area of the Scottish Highlands and can only be reached comfortably by car. Weather in this part of Scotland can shift fast, so warm, waterproof layers are worth bringing regardless of the forecast.
The machine hall carved into the mountain is large enough to fit a cathedral inside, and it was blasted entirely out of solid rock with no natural cave to start from. This makes the engineering work involved one of the more remarkable civil feats of 1960s Britain.
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