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While it's unlikely to reach this value, it's such a high figure that actually can solve the energy storage problem altogether.

If someone actually finds a way to make a feasible storage solution from it. Nobody is installing hydrogen energy storage right now.

Again, the answer is point to an unproven form of storage and assume it'll be a silver bullet.

It's underground salt caverns. This is extremely feasible and has been done for decades with natural gas.

How many Gigawatt hours of underground H2 storage are currently deployed? What company can I call to install 1 GWh of hydrogen storage?

Ah, the good old "if it hasn't happened yet it can't happen" argument.

I'll come back at you: what technological component involved in underground storage of hydrogen is not already demonstrated?

It's pretty well-established tech at this point.