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Ultra-High Voltage


Technology Description

A power system is considered ultra-high voltage (UHV) at 800 kV and above. A higher voltage results in a lower current in the conductor at the same power transmitted. This leads to lower energy losses as most of the losses are current dependent, but also can save some material due to a lower diameter of conductor needed.
The technology is available in alternating current and direct current. Currently there are lines up to ±1100 kV UHV DC and 1100 kV UHV AC in commercial operation.

Relevance for Net Zero

Ultra-high voltage is necessary for reaching very remote renewable resources. The choice between alternating current (AC, lower investment costs) and direct current (DC, lower losses) will depend on the specific conditions of a transmission project.

Key Countries

Brazil, China, Denmark, India, Sweden, United States

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