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.
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.