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Gravity Storage 101 Or Why Pumped Hydro Is The Only Remotely Real Gravity Storage
(cleantechnica.com)
this post was submitted on 17 Jan 2024
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That's pretty neat! But it seems to me it's not storage because they're not putting energy in to get out later. It's more like mining naturally-occurring potential energy from the Earth's crust. Probably that potential energy formed millions of years ago when tectonic plate activity pushed the rock up to its present elevation. So - it's geothermal energy with extra steps.