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>Where are we going to get enough cobalt?

Nobody would use this kind of lithium ion battery for grid storage. Instead use Lithium Iron Phosphate (LiFePo4) batteries- no cobalt needed. LiFePo4 batteries are absolutely good enough right now for grid storage.

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And any sort of lithium battery is the most expensive storage.

Utilities are not generally in a habit of reflexively choosing the most expensive alternative, even if some have plumped for nukes in places where ratepayers have no say.

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