Renewable energy sources like wind and solar can't always provide power when we need it. To solve this, scientists are looking at storing excess energy using compressed air. This means using electricity to squeeze air into underground storage tanks. When we need power, the air is released and used to generate electricity. This technology has been around for over 50 years and is gaining interest as a way to store large amounts of energy. Different ways of storing the compressed air underground are being explored, and there are already projects using this method successfully.