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I suspect for extremely large batteries or seasonal shifting (summer->winter) flow batteries will still have a place, but I could be wrong.


Thermal batteries make more sense for that, but they need to be super-cheap. One possibility:

https://austinvernon.site/blog/standardthermal.html


Flow batteries aren't any good for seasonal shifting; the capex per kWh-capacity is much too high. Granted, ordinary batteries aren't good for that either.




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