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Ive posted this before but it’s been a while, I like to add it to the conversation when talking about energy storage. https://energyvault.com/

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I have heard quite a lot of skepticism about this. For example:

https://www.youtube.com/watch?v=NIhCuzxNvv0

Well, all I have to say is that this is the first practical gravity battery that isn't total garbage. In theory you can scale it up and eventually have something worthwhile...

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