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With present commercially available technology hydrogen is the energy storage you use when you don't have any other options.

If you don't have a practical option to build hydro (on river, pumped or a combination of both), and the energy storage requirement is too large to do it with batteries, that's when you start looking at hydrogen.

But if you can do it with hydro or batteries then that's a far more efficient approach.

Exception being if you've got some cheap electricity that's intermittently available, and you've got a gas distribution network, then blending some hydrogen into the gas is a proven approach. Has been trialled successfully in part of Adelaide and has been done elsewhere too - and the trial in Adelaide involved real homes occupied by ordinary people with their existing appliances burning the mixed gas. That's only a blend though - the limit is 13% hydrogen mixed with natural gas. Anything beyond that gets problematic in terms of compatibility with existing appliances etc.