I hope you aren't making the assumption that storage = batteries, then arguing because weeks and months of batteries would be needed, it's impossibly expensive.
It's difficult to see any of the alternatives displacing batteries for short-term storage. Batteries aren't a good fit for long-term storage, which is where alternatives should be competitive. But that market is essentially 0 right now.
He's probably thinking of the cost of batteries needed for seasonal storage, but it's hard to tell. Using batteries that way would be foolish, of course.
Another option is to simply repurpose old batteries to stationary storage applications. Even if it’s only holding a five percent charge, who cares if they’re just sitting in a building somewhere.
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