Background The Yangtze River is the longest river in Asia and the third longest river in the world. It is a vital part of life in the area. In order to control flooding downstream and control the flow of the Yangtze River, which facilitates transportation, ship - ping and irrigation downstream, a large gravity dam was opened in 2012 on the Jinsha River – a tributary of the Yangtze River in Yunnan Province and Sichuan Province, southwest China. The Xiangjiaba Dam replaces fossil fuel-burning power plants to become China’s third-biggest hydroelectric power station. The output of the generating station is connected to a ±800 kV HVDC link, the Xiangjiaba–Shanghai HVDC system, which transmits much of the power to Shanghai in east China, where the economy is booming. Challenge The Xi

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