this application of hydrogen is not deployed anywhere globally at scale
There is good reason for that. Storing hydrogen is quite difficult. It requires large, expensive pressure vessels, and even then you can't store much. Additionally, it loves to leak out of anything you put it in, due to how small the molecule is. These storage issues are one of the primary reasons it flopped in cars.
Hydrogen storage is a significant focus of materials science and chemistry research for this reason right now. There's a lot of interesting possibilities being studied to solve those challenges.
Everytime I see the issue with hydrogen storage I wonder, wouldn't it be easier to use carbon capture and make methane (or something like that) if you are storing it for months?
