A new underwater energy storage system could help solve renewable power’s biggest challenge of storing excess electricity.

Offshore wind and solar farms are racing ahead, but the grids they feed still struggle with a basic problem: how to hold on to surplus power for the hours when the breeze drops and the sky goes dark.

Researchers at MIT continue to look for ways to turn concrete into a perfect energy storage option. The researchers first shared their findings in 2023, suggesting that concrete could be used to store ...