Rocks to Batteries for City Power
A Portuguese study has developed a technique that allows surplus renewable energy to be stored as compressed air in porous underground rocks. This system can store large amounts of energy—up to one terawatt-hour at a depth of 3,000 meters—and enough to meet the needs of a medium-sized city. The technology relies on excess electricity from sources like wind and solar to power compressors that push air into underground reservoirs under high pressure. When needed, the stored air is released to generate electricity through turbines without burning fuel. This method offers a solution to the challenge of energy storage and enhances grid capacity, with the potential to support grid stability and recovery after outages. However, real-world implementation would require several years and a clear legislative framework to facilitate the exploitation of underground space for renewable energy storage.
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