Underwater balloon power storage
Store excess electricity grid power by pulling large balloons to the bottom of the sea, then release to power a generator/turbine when more energy is needed.
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You don’t need to pull them to the bottom, just fill them up and pressure gives you the power back whenever you want it. Amazing idea tbh.
Notts Uni guys are working on this still I think. https://www.youtube.com/watch?v=ktup6CAvfGo
Not as silly as it sounds, check this in Toronto https://www.youtube.com/watch?v=GicQwXbNnv0