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High temperature superconductors (HTS) are progressing rapidly to commercial use in a variety of applications, particularly in the electric power sector. The most advanced applications are underground cables for the power grid, where multiple cables are in service today on a beta-site test basis. A highlight is the recent energization of the world’s first transmission-level voltage cable at a LIPA site in Long Island, New York. Fault current limiters, generators, transformers, and magnetic energy storage are also all being developed. HTS technology is expected to have a significant impact in upgrading the world’s power grid, making it more efficient and stable, and addressing significant power bottlenecks.