Powering up: UK hills could be used as energy 'batteries'

Engineers explore using gentle slopes rather than steep dams or mountains to store electricity

Hundreds of hills across the UK could be transformed into renewable energy batteries" through a pioneering 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.