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Magic Mountain

18/6/2018

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I know what you’re thinking! This is going to be about a trip to Disneyland. Well, in a word, no! Although I have been to Magic Mountain in Disneyland, this is about an environmentally sensitive power station in Wales that’s built inside a mountain.

Before going to Llandberis, I’d never been to Wales, let alone heard of Electric Mountain. The drive there in my tiny rental car was challenging to say the least as that morning it had started to snow in the English Midlands and continued throughout the day. Although no stranger to driving in the snow, it’s usually been in a 4WD or with chains on. Driving the smallest, cheapest front wheel drive rental I could find through an unfamiliar landscape and foreign country is an experience not to be missed, especially in England, where nobody seems to be used to driving in the snow and the entire road system seems to shut down at the first hint of a snowflake.


Consequently, the four and a half hour drive, turned into a seven hour white knuckle ride and at one point it was snowing so hard I could barely see out the window. It was a great relief to finally reach the hotel without having skidded on ice or become lost in the Welsh Highlands.

Waking up the next day, it was amazing to see the snow-capped countryside through which I’d unknowingly driven in the dark. There were mountains, a lake and a wonderful town filled with slate roofed houses. Nearby, I was told there was a hydro electric power station called Electric Mountain. Whilst the landscape was scarred from centuries of slate mining, there was no power station to be seen. Deciding to go on a tour of the mysterious (and somewhat invisible) power station, there was nothing more than an information building to suggest it existed. However, once the introductory video started, it began to come clear, the entire power station was built into the mountain, not on the top, nor on the side. An enormous cavern was dug out and the entire station was built inside the mountain.

Similar to other hydro electric stations I’ve seen, this is one which works by releasing water from an upper holding dam to produce electricity in peak times of demand and then pumps the water back up during off peak times. Not a sustainable form of energy, but a really clever one. Add to this the fact that they can bring the power station generators online in twelve seconds, rather than hours for a standard plant, then you have one amazing feat of engineering.

Apart from the insanely brilliant idea of hiding the power station in the mountain, the other environmental sensitive aspects of the design include venting the water uphill to slow its speed, before it enters the lake. This ensures that there’s no visible output of water, as well as protecting the integrity of the lake and the fish that live inside. They also built a tunnel for the fish to go through so they can leave the dammed lake and head back upstream to spawn.

Inside the mountain itself, the enormous cavern houses the power generators into which the water rushes, to spin the turbines at 500rpm and produce electricity. The ability to rapidly switch on or off means continuity of power supply across the UK.

From an educational point of view, this is a wonderful day trip if you’re in Wales. It’s an opportunity for students to see how innovation, industry and environmental concerns can all be effectively managed without a detrimental effect. With a power crisis looming in Australia, it might be worth building a couple of these and a nuclear plant for good measure to provide clean and reliable sources of energy.​
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