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Won't HTS wires still need to be surrounded by cooling liquids even if they do not require absolute zero? I assume that there will still be a need for significant retrofitting of the existing conduits. I do believe that any new subdivisions could/should be built with HTS in mind, but older underground systems will need a lot of work.

All large underground power cables have a coolant. Currently it's a type of oil; more expensive (and problematic) than the liquid nitrogen HTS uses.

I honestly am not familiar enough with exactly how things fit into the conduits. But if the cooling system was such that it ended up losing all the space that HTS wires saved, then it wouldn't be worth it.

jp
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