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HVDC really started becoming a topic again in the 2010's. In the USA, it is catching on very slowly. The idea is much lower transmission loss at very great distances, like, across the continent, but, the US grid is not set up such that long distance transmission on that scale is super adventageous. In China, where power is generated deep in land and consumed along the coast, and the grid is still really developing, HVDC is far more popular.
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