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Sweden switches on largest battery energy storage system in the Nordics - Energy Storage
(www.ess-news.com)
Everything about energy production and storage.
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Sadly no info whatsoever on batteries.
I found this on it; still need to read through it. Some sort of lithium battery technology, it seems.
Li-Ion seems to be the go-to solution. I hope new static energy storage projects will prefer other options (Na-Ion, flow batteries, ..) since there's a limited supply of Lithium and we need it for vehicles.
It's the only chemistry possible to source unfortunately. I read about other chemistries, but they are hard to find.