On March 20, the 220kV Weizhou Island Cross-sea Power Grid Interconnection Project, surveyed and designed by GEDI, was put into operation.

The project involves constructing a 220kV substation on Weizhou Island and connecting it to the 220kV substation in the mainland area of Beihai City via a newly built 220kV transmission line. The 220kV transmission line was built using a "land cable + submarine cable + land cable" configuration, stretching a total of 47.9 kilometers, of which the submarine cable spans 44.8 kilometers. Upon the operation of the project, the power supply capacity of Weizhou Island has increased more than fourfold, significantly enhancing the safety and reliability of local power supply, and effectively ensuring robust support for the livelihood of residents and the accelerated development of high-end cultural and tourism industries on the island. Meanwhile, the project lays a crucial foundation for future offshore wind power transmission in the Beibu Gulf, transforming Weizhou Island from a "power consumer" into a "green energy hub".

Faced with ecological and geological challenges, GEDI designed a long-distance, high-elevation‑difference trenchless horizontal directional drilling solution, developed a drag-reducing pulley system, and pioneered the design scheme of installing anti-fouling curtains near coral reefs, achieving a harmonious balance between project construction and ecological preservation. Meanwhile, the 220kV Weizhou Substation was constructed to the highest three-star green building standards, establishing China's first green, low-carbon island-type substation. GEDI also has developed China's first three-dimensional digital intelligent O&M system for integrated transmission, transformation, and distribution, specifically tailored for a cross-sea power grid interconnection project. This system fully digitizes information on substations, submarine cables, submarine topography, and islands, greatly enhancing both O&M efficiency and safety management capabilities.