South Korea unveils 100x current-carrying wire
- South Korean utilities and cable makers are not unveiling a new room-temperature wire; they are expanding superconducting power-cable projects that use cryogenic cooling to move more electricity with near-zero resistance. - Korea Electric Power said in July 2025 its superconducting grid model for data centers could send three to five times more current than copper cables without transmission loss in operation. - The “100 times” figure circulating online matches older industry descriptions of superconducting current density, not a newly announced Korean wire. (global-sei.com)
Electric current in an ordinary copper wire wastes energy as heat. A superconducting wire avoids that loss only after it is cooled to very low temperatures. (arxiv.org) That is the key fact missing from posts describing a South Korean “100x current-carrying wire” as a new standalone material. The technology South Korea is actually deploying is superconducting cable for power grids, not a room-temperature replacement for copper. (arxiv.org) (newsis.com) Korea Electric Power, or KEPCO, said on July 11, 2025 that it had proposed a superconducting station and power-system model for data centers. The utility said the cables can send three to five times more current than existing copper cables with no transmission loss and can pair with a superconducting fault-current limiter for protection. (newsis.com) KEPCO said it had already moved through several demonstration stages after developing a 23-kilovolt cable and a current limiter in 2013. Its latest pitch is aimed at large power users such as data centers, where demand is rising faster than new transmission lines can be built. (newsis.com) The basic idea is simple: the colder the superconductor, the less electrical resistance it has, until resistance drops to zero below a threshold temperature. That is why superconducting cables need cryogenic systems, which add cost and engineering complexity even when line losses fall sharply. (arxiv.org) The “100 times” claim appears to come from a different metric: current density, or how much current can pass through a given cross-section. A technical review from Sumitomo Electric says high-temperature superconducting cable can exceed 100 amperes per square millimeter, more than 100 times copper cable. (global-sei.com) That does not mean a Korean lab has just revealed a new ambient wire that can be dropped into homes, gadgets, or national grids. It means superconducting systems can pack far more power into a smaller cable when they are built with specialized materials, cooling equipment, and protective hardware. (global-sei.com) (arxiv.org) South Korea has been working on that kind of system for years. Earlier reporting on LS Cable & System’s projects described superconducting cables carrying five to 10 times the power of conventional copper lines, again under superconducting operating conditions rather than at room temperature. (koreajoongangdaily.joins.com) (koreatimes.co.kr) The real story, then, is narrower and more practical than the viral version. South Korea is pushing superconducting grid hardware for dense, power-hungry sites, while the hard parts remain cooling, cost, long-distance reliability, and large-scale manufacturing. (newsis.com) (arxiv.org)
