Future costs are never certain. And it may depend where in the world you are. I’m pretty sure salt caverns full of hydrogen are a lot cheaper than most people e

Future costs are never certain. And it may depend where in the world you are. I’m pretty sure salt caverns full of hydrogen are a lot cheaper than most people expect batteries to get for storing (transmission grid scale) energy for a month or more. And I think that’s mostly because lithium, plentiful as it is, is unlikely to ever be as cheap as water. But admittedly not everywhere has the geology for the storing the hydrogen really cheaply. And, of course, in many ways an electrolysis to hydrogen storage to fuel cell system is just a type of (flow) battery. So in some ways this is a question of what type of battery system will win (as are discussions of hydrogen vehicles really, though I’d personally see those as staying pretty niche). Edit: typo further to future.