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Concept

High-voltage direct current

High-voltage power lines stretch across a misty landscape, symbolizing the transmission of electricity through high-voltage direct current technology.

A modern transmission technology, first deployed commercially in Sweden in 1954, that moves electricity as DC at hundreds of thousands of volts. It avoids the reactive losses and synchronisation problems of long AC lines, making it the preferred system for very long overland links, undersea cables, and ties between asynchronous grids. The Chinese Changji–Guquan line, energised in 2019, carries twelve gigawatts at 1.1 million volts over 3,300 kilometres.

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