[Corazoor]

> Hydrogen brings with it other challenges. Maybe it's easier, maybe it's not. Neither of these two solutions have been deployed at any significant scale so we really don't have a good idea.

We do have a rather good idea. There are several studies and large test facilities both in Europe and the US. Specifically in the area I was mentioning (salt caverns). From wikipedia on hydrogen storage: "Underground hydrogen storage is the practice of hydrogen storage in caverns, salt domes and depleted oil and gas fields. Large quantities of gaseous hydrogen have been stored in caverns by ICI for many years without any difficulties." "Another study referenced by a European staff working paper found that for large scale storage, the cheapest option is hydrogen at €140/MWh for 2,000 hours of storage using an electrolyser, salt cavern storage and combined-cycle power plant."

There is more here: https://en.wikipedia.org/wiki/Hydrogen_storage