China just activated the world's longest submarine power cable — a 1,100-kilometer high-voltage direct current line connecting Hainan Island to the mainland power grid, delivering clean electricity from Guangdong's massive solar and offshore wind installations to islands previously dependent on expensive diesel generation.
The South China Sea Submarine Power Interconnection lays 1,100 kilometers of armored HVDC cable across the South China Sea seabed at depths reaching 1,600 meters, connecting a 3,000-megawatt converter station in Hainan to the Guangdong grid near Zhanjiang. Power flows in both directions — delivering clean mainland energy to Hainan's 10 million residents during peak demand and exporting surplus Hainan offshore wind electricity to the mainland during strong South China Sea generation periods.
The cable eliminates Hainan's remaining diesel generation entirely, reducing island carbon emissions by 4.8 million tonnes annually. Previously isolated island communities along the Paracel and Xisha island chains receive grid electricity for the first time through branch connections tapped from the main cable route.
Source: China Southern Grid Corporation, Hainan Provincial Energy Authority, Chinese National Development and Reform Commission, 2025
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