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I understand the use of wave in this context like hydrogen fuel cells in NA. It's amazing to hear that our governments are still giving money to what is clearly a bad idea (hydrogen). I think, like in the case of tidal power, you could chalk it up to doing something to sate special interests.

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Hydrogen will probably fill a niche for seasonal grid energy storage. In general pumped storage > batteries > hydrogen for cost/efficiency, but hydrogen has the advantage that it's cheap to store for weeks or months at a time while pumped storage/batteries are suited only to smoothing out daily or weekly variations in solar and wind output.

It's more useful for getting from 90%/95% to 100% green energy than from 0% - 90% though, and it's more expensive than natural gas performing the same function so we likely won't see it used in anger for a while.

> but hydrogen has the advantage that it's cheap to store for weeks or months at a time

Where did you get that idea? Hydrogen is extremely hard to work with and really really wants to escape from any containment vessel you put it in. See https://www.sciencedirect.com/science/article/pii/S136403212...

https://en.wikipedia.org/wiki/Underground_hydrogen_storage

Your article talks about it positively.

Yes, but look at the loss rates for some of the storage methods.

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