Group 1 - The 220 kV submarine cable project, the first in China to use domestically produced insulation materials, has successfully completed the critical phase of cable laying, spanning 44.8 kilometers from Weizhou Island to the landing point in Beihai [1][2] - The project, initiated by the Southern Power Grid Guangxi Electric Power Company with an investment of 858 million yuan, includes the construction of a 220 kV substation on Weizhou Island and a new 220 kV line connecting to the Beihai 220 kV Dunhai Station [2] - The power supply capacity for Weizhou Island is set to increase from 35,000 kW to 161,000 kW, utilizing over 70% clean energy from the mainland, which will support the island's green development and enhance the well-being of its residents [2] Group 2 - The project is expected to be completed and put into operation by mid to late January 2026, following the connection of the submarine cable to the land cable and the commissioning of the Weizhou substation [2] - The infrastructure will also facilitate the integration of offshore wind power in the vicinity, providing a crucial transmission pathway for future offshore wind energy projects in the Beibu Gulf [2]

Core Viewpoint - The Southern Power Grid's 220 kV undersea cable project to Weizhou Island has officially commenced, marking the first domestic use of locally produced insulated materials for such cables, which will end the island's "isolated grid operation" history [1][2]. Group 1: Project Overview - The undersea interconnection project is being constructed by Southern Power Grid Guangxi Electric Power Company with a total investment of approximately 858 million yuan [2]. - The project involves laying 44.8 kilometers of undersea cable from the Beihai 220 kV Duhai Substation to the 220 kV Weizhou Substation, with the cable installation expected to last 15 days [2]. - The project is anticipated to be accepted and operational by mid-January 2026 [2]. Group 2: Technological Advancements - The undersea cable has been jointly developed by Southern Power Grid Scientific Research Institute, Guangxi Electric Power Company, Zhejiang Wanma Polymer Materials Group Co., Ltd., and Jiangsu Hengtong High Voltage Undersea Cable Co., Ltd., achieving significant breakthroughs in domestic cable insulation technology [2]. Group 3: Impact and Benefits - Once operational, the power supply capacity on Weizhou Island will increase from 35,000 kW to 161,000 kW, addressing the island's public power supply shortages [2]. - The project is expected to reduce carbon dioxide emissions by 4,318 tons annually based on gas-fired power generation carbon emissions calculations [2]. - The interconnection will also support future offshore wind power integration in the Beibu Gulf, establishing a new energy hub [2].