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The construction of a 500-kilovolt (kv) ultra-high voltage submarine cable beneath the Zhoushan Strait has been completed. The cable covering 17 kilometers links the power grids of Zhoushan City and Ningbo City in China's eastern Zhejiang Province. It is the country’s first domestically made 500kv submarine cable. It is also the world's first 500kv cross-linked polyethylene-insulated submarine cable and considered to be safer and eco-friendly.