Oil and gas prices have risen sharply after Russia’s invasion of Ukraine, and as a result many countries have signalled a move towards more renewable energy. One of the challenges for the future will be how to store energy produced by wind and solar power so it can be used at the right times. Professor Seamus Garvey and a team at the University of Nottingham tell us about their prototype machine which uses compressed air and heated gravel to tackle this problem. We also hear from Professor Mara Prentiss of the University of Harvard on the science behind these new ideas, and Heymi Bahar of the International Energy Agency to give an overview of this sector at the moment.

Presenter/Producer: Hannah Bewley