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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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I found this on it; still need to read through it. Some sort of lithium battery technology, it seems.
I don't know specifics on this battery farm, but almost all are essentially fleets of shipping containers filled with smaller batteries, rather than some super-cool-mega-battery, so it's probably a safe assumption that this is a landmark project in scale, rather than in technology specifics.