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Hills across the UK could be transformed into renewable energy “batteries”

Hundreds of hills across the UK may be transformed into renewable energy “batteries” through a hydropower system embedded underground.

A team of engineers have developed a system that adapts one of the oldest forms of energy storage, hydropower, to store and release electricity from gentle slopes rather than requiring steep dam walls and mountains. Hundreds of potential hydropower sites across the UK could be made, which would be quicker and cheaper to build than traditional hydropower dams and also lead to less negative environmental impacts.

The hillside projects would mimic the UK’s traditional hydropower plants by using surplus electricity to pump water uphill, and later releasing the water back down the hill through turbines to generate electricity when needed.

The company behind the plans, RheEnergise, said the project will work by using a mineral-rich fluid, which has more than two and a half times the density of water that will pump the dense fluid up a hill with a height of 200 metres, at times of low electricity demand. It would be held in an underground storage tank larger than an Olympic-size swimming pool.

Then when extra electricity is required, the fluid would be allowed to flow back down the hill, over generating turbines, to effectively return the electricity used by its pumps earlier in the day back to the grid.

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