Switzerland-based energy storage specialist Energy Vault Holdings Inc (<a href="https://www.nyse.com/quote/XNYS:NRGV" target="_blank">NYSE:NRGV</a>) has been tapped to deploy a 100-MW hybrid gravity-based energy storage system at a mine owned by Sardinian state-run coal mining company Carbosulcis SpA which is designated to be transformed into a carbon-free technology hub.