The world’s longest high-voltage electric power transmission line is going to be build

May 15, 2012

“Chinese engineers and constructors began the construction works for the world’s longest high-voltage electric power transmission line which is going to be 2210 kilometres long and have the working voltage of 800 kV,” Xinhua agency informed.

Engineers and research-construction teams employed by the Chinese state corporation State Grid Corporation of China (SGCC) on 13th of May inaugurated works on the world’s biggest high-voltage direct current transmission line. The 2210 kilometres long 800 kV overhead cable transmission line is going to link western regions of Xinjiang province, Hami prefecture in the east and Gansu, Shaanxi, Ningxia and Shanxi regions. The end of the line is planned in one of the biggest Chinese cities Zhengzhou, the capital of Henan province.
According to the Xinhua agency the yearly amount of transferred energy is planned to reach 237 milliard kWh and the capacity 8 million kW which would be the highest rate among all the transmission lines currently under construction. The investment is necessary, according to the Xinhua agency, because of the unequal distribution of energy resources and power industry objects in China. Reserves of coal-seams in Xinjiang province are estimated for 2 billion tons. This region is known in China for regular and strong winds thus the biggest number of wind farms is located in this area. The energy produced in the western part of the country is consumed by the industry and companies located in the eastern and central parts of China. This forces the construction of huge transmission lines.
General director of SGCC Liu Zhenya informed the Xinhua agency that construction of the new transmission line is going to reduce the emission of sulphur dioxide by 317 thousand tons and nitrogen dioxide by 267 tons. Such amount of pollution would be emitted during the transportation of the resources to the power plants in eastern and central parts of the country as well as usage of older short-distance low-voltage transmission lines.
New transmission line will cost 23,39 milliard yuan that is 2,3 milliard GBP and will be finished in 2014. SGCC on 13th of May has also started the construction of the other transmission line with the slightly lower working voltage of 750 kV. The line is going to connect the energetic system of Xinjang, Gansu and Qinghai provinces with the rest of Chinese energetic systems. It is going to be 2180 kilometres long. In the Gansu and Qinghai provinces are located giant solar power plants and wind farms. The transmission line is supposed to be ready in 2014-2015 and will cost 9,56 milliard yuan that 941 million GBP.
The new Chinese transmission lines are at the same time going to be the world’s longest direct current transmission lines with the highest working voltage.
In China construction of the 2071 kilometre long Xiangjiba – Shanghai direct current transmission line with the 800 kV voltage is also under way but it has not reached the working voltage nor the planned size. But after the construction of this line in 2015 5 out of 6 biggest high-voltage transmission lines are going to be located in China.

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