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One of Germany’s largest utilities wants to build what it says could be the biggest 'battery' in the world to date – using underground caverns filled with saltwater as a giant redox flow energy storage system.
EWE GASSPEICHER, a subsidiary of utility EWE based in Oldenburg, northern Germany, said a few days ago that it wants to construct redox flow batteries inside underground salt caverns currently used for storing natural gas.
The university team then hit upon the idea of using the underground salt caverns as containers for the electrolyte. The underground caverns are often vast, offering potential for storing large amounts of energy. Initially, the project’s battery will be constructed and contained in plastic containers at another site before being transferred into the caverns.
For some alternative energy enthusiasts, Musk's deal wasn't good enough. Instead of buying Tesla's Powerwall, they build their own DIY versions using recycled batteries for a fraction of the cost. Then, naturally, they share their creations and swap knowledge with other hobbyists across the internet. DIY powerwall enthusiasts congregate on a dedicated forum, in Facebook groups, and on YouTube.