You can’t be serious! How do you think hydropower stations, tidal generators and pump batteries work? In fact, Musk is the only kook who believes polluting & toxic batteries are the solution to power-storage, other smarter and environmentally conscience engineers prefer gravity-based systems.
Then there are these also…
Even some modern elevators in tall buildings can generate power on the way down.
Lift Energy Storage System: Turning skyscrapers into gravity batteries…
This is a 19th-century aerial ropeway that’s run entirely by gravity, it uses no power and moves 300 tonnes a day…
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