I think I understand how the battery where they drop a big weight down a mountain works; how do these work? Or how does it compare in effectiveness as I assume it's probably the same principle?
They need to pair this with Tidal power
Tidal power probably needs shallow water while these would be great in deep water
They're going to...pull a vacuum in a concrete sphere deep underwater. And then use the force of water being sucked back in to turn a turbine.
...sure.
Interesting concept, but not very scalable. It's basically a reversed dam - when it's full, there's 0m head of water. Then with excess energy, you lower the level inside, storing the energy in the water outside. E.g -2m head. Water then flows in to equalise head, and doing so, regenerates electricity. Adding depth to supercharge pressure differentials is a good idea, although I wonder how they limit the flow rate, or otherwise prevent cavitation shocks each cycle.
Could be useful as a private industrial battery, but a dam would still be better on an infrastructural level.
Dams do have their own significant challenges with habitat destruction and displacing people and silt buildup
Why not submerge a tank with a hole at the bottom and blow air in the tank via a hose to store energy?
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