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Rivian Follows Tesla’s Lead, Opens Charging Network to Other Brands
(discuss.online)
This is a most excellent place for technology news and articles.
Do they use NACS or a different style connection?
They're moving to NACS going forwards, but the current fleet and network uses the J1772 plug and CCS like basically everyone else up until now.
Rivian hasn't yet adopted NACS, these are CCS.