How to turn coal mines into giant, green batteries
Scientists recently proposed repurposing old mine shafts to generate electricity by lowering containers of sand and storing electricity by raising the sand back up again. While the
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Old coal mines can be converted into "gravity batteries" by retrofitting them with equipment that raises and lowers giant piles of sand. Underground Gravity Energy Storage system: A schematic of different system sections. ( Credit: JD Hunt et al., Energies, 2023)
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