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Huh, interesting, I was under the impression that losses at distances like that would make it impractical
Losses are a lot lower with DC transmission, but it has been traditionally more expensive. Costs are coming down now as more research and better power electronics are becoming available.
Edit. Here’s a pretty well know one in the US, the Pacific Intertie
https://en.wikipedia.org/wiki/Pacific_DC_Intertie