935
The necessary technologies
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The main grid storage tech I've heard about recently relies on decade-old Nissan Leaf EV batteries that can be purchased second hand pretty cheaply (in comparison to brand new cells). Pretty neat way to repurpose them IMO.
https://cleantechnica.com/2021/10/25/old-nissan-leaf-batteries-being-used-for-grid-scale-storage-in-california/
It's profitable, so I'm assuming it should be reasonably affordable for utility companies or local municipalities to build and own grid storage facilities in the near future