It's underground salt caverns. This is extremely feasible and has been done for decades with natural gas.
Re:Activists who embrace nuclear power
by sir_bearington on Friday February 26, 2021 @02:06PM
(#26278498)
How many Gigawatt hours of underground H2 storage are currently deployed? What company can I call to install 1 GWh of hydrogen storage?
It's been done for decades: https://en.wikipedia.org/wiki/Underground_hydrogen_storage
It's pretty well-established tech at this point.
Again, the answer is point to an unproven form of storage and assume it'll be a silver bullet.