Technology
This is the official technology community of Lemmy.ml for all news related to creation and use of technology, and to facilitate civil, meaningful discussion around it.
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Because it's super inefficient
Not if the energy would go to waste. This is a mechanical battery to store surplus power generation from things like wind and solar.
That’s the whole point of grid energy storage. Even if there are losses, it’s acceptable considering that otherwise you would need to burn fossil fuels in a peaker plant to keep the grid balanced. You aren’t supposed to recharge a battery like this with fossil fuels.
It wouldn't go to waste if we were to use "gravity batteries" that have existed for centuries: hydropower
Is it more or less efficient than a derelict mine and an unstored energy surplus?
No it's not.