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There is minimal leakage when storing hydrogen in salt caverns

Hydrogen can be stored in salt caverns for long periods with a remarkably low estimated leakage rate of only .04% per year. Once hydrogen is stored in the salt caverns there is little to no natural leakage. This is because the natural impermeability and self-healing properties of the salt formations effectively prevent gas from escaping. The hydrogen that does leak from salt caverns is not from naturally occurring leaks but from small amounts of hydrogen released during maintenance or emergency shutdowns.1

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Footnotes​

  1. Frazer-Nash Consultancy. (2022). Fugitive hydrogen emissions in a future hydrogen economy. UK Government. https://assets.publishing.service.gov.uk/media/624ec79cd3bf7f600d4055d1/fugitive-hydrogen-emissions-future-hydrogen-economy.pdf ↩