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A comment on Energy Vault – Gravitational Batteries. Parent comment

Re:Energy Vault – Gravitational Batteries by lordnacho on Monday January 11, 2021 @07:29AM (#25728021)
Couldn't you instead of making solid concrete blocks fill them with junk, using just a little concrete to make the shape right?
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Re:Energy Vault – Gravitational Batteries by thechao on Monday January 11, 2021 @01:31PM (#25733532)
They are, already. They use a type of rock "glue" to fuse together rubble — in some cases old broken up concrete. The GP comment is a pretty basic HN middle-brow response.
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