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Why aren't water wheels widely used for electric power generation? Could they be used in waterfalls? - Quora
![Scientists propose turning abandoned mines into gravity batteries | A system in which electricity is generated by releasing a heavy load, allowing it to drop. : r/science Scientists propose turning abandoned mines into gravity batteries | A system in which electricity is generated by releasing a heavy load, allowing it to drop. : r/science](https://external-preview.redd.it/4mMGV92Mbjdf4OWlaH4PdljakVBYDSBgcfJy-nOTGzo.jpg?auto=webp&s=d1ace1b636563200dcd6b23676157f3acd1a0dd3)