this post was submitted on 11 May 2025
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A German Experiment Proved That Simple Concrete Spheres Make Fantastic Batteries. Now, California Plans To Submerge A 9-Meter Diameter Sphere In The Ocean And Is Already Planning Versions Of 30 Meters (farmingdale-observer.com)
submitted 2 days ago by Dadifer@lemmy.world to c/science@lemmy.world
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[–] LaLuzDelSol@lemmy.world 4 points 1 day ago

Regular pumped hydro has an overall efficiency of about 80%. I would guess these sphere things would be similar, assuming you can put them near a high-voltage line, since the underlying technology (pump and turbine) is the same.