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I was thinking the same thing. Though I am surprised to hear that seasonal storage of hydrogen is doable. I imagined that the size of pressure vessels required, as well as the leakage losses of hydrogen in general, would make that infeasible.

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Hydrogen can be stored underground just like natural gas. The cost is very low, particularly if there are salt domes available where large cavities can be solution mined. For example, the salt formation at Delta, Utah has room for 100 such cavities that could store enough hydrogen that (if burned in combined cycle power plants) could power the entire US grid for 30 hours. The estimated storage cost is as little as $1/kWh of storage capacity (power related costs are extra).

Here is a commercial example of underground hydrogen storage that has been in service since 2007. It is a salt cavern in Texas. It is part of extensive hydrogen infrastructure connecting many industrial users (600 miles of pipeline)

https://investors.linde.com/archive/praxair/news/2007/praxai...

Would not have expected to see Delta, UT on HN. I spent a significant amount of time there as an undergrad.

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