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Cross-sea power transmission has been an important method for offshore wind power development and cross-sea interconnection. More than 7000 km of cross-sea transmission projects have been built up around the world at present, mainly in Europe, Middle East and Southeast Asia, Among which Europe has the almost 95% of the global market. Meanwhile, there are many island and peninsula countries in Asia, having a great potential of offshore power and economy development, which will make the demand of cross-sea transmission increase rapidly.
Compared with that of power transmission on land, the total capacity of cross-sea transmission is less than 1%. While compared with that of submarine communication cable and petroleum pipelines, the total length is less than 1% and 10% respectively. Considering rapid increasing demand of clean energy at sea and regional cross-sea interconnection, it is believed that the global cross-sea power transmission will have a great market potential in the future, which means higher technical and economic requirements are necessary for submarine cable.