The biggest battery in the world could be in a salt cave in Germany

If this giant cave battery ends up working the way it's intended to, it could change the way that the world views energy storage.
Caves aren’t just homes to giant bat colonies — thanks to modern technology, they can also house batteries. And not just any batteries — the world’s largest battery. A few weeks ago, German utility EWE unveiled its plans to build an energy storage system in an old salt mine that could ultimately become the biggest battery on Earth.
The ambitious new project has been named “brine4power,” and will take form in underground salt caverns that were previously natural gas storage facilities, and even further back in history, were salt mines. All these caves have a volume of 3.5 million cubic feet, which ought to give the resulting battery a capacity of up to 700MWh at an output of 120MW.

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