[galaxyLogic]

But more thermal storage you want more salt you want, and it's gotta cost something, right?

https://en.wikipedia.org/wiki/Molten-salt_battery

[xyzzyz]

If you read the article you sent me, you'll learn that, just as I said, you don't use sodium chloride, aka table salt, aka sea salt, for these purposes.

[aeonfox]

A better example are sodium ion batteries, which are about to take off in a big way

https://www.catl.com/en/news/6812.html