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High-temperature superconducting (HTS) cables have proven to be technically feasible, but are they economically feasible? A 2002 Rand study found that HTS underground cables are an attractive retrofit option in urban areas with existing underground transmission circuits. They allow utilities to avoid the expense of new excavation to increase capacity. To date, however, outside of a few demon projects, there have been few deployments. What's holding back this technology? Is it too complex? Is it too expensive?
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