China has worked hard to develop UHV DC power transmission and other clean energy technologies.
UHV is defined as voltage of 1,000 kilovolts or above in alternating current and 800 kilovolts or above in direct current. It can deliver large quantities of power over long distances with less power loss than the more commonly used 500-kilovolt lines.
China is the global test bed for ultra-high voltage (UHV) transmission lines, a technology that can carry electricity across vast distances with much greater efficiency than the high voltage lines that you’re probably used to seeing.
Since 2006, it’s built 19 of these multi-billion-dollar lines, stretching almost 30,000 kilometres and supplying 4% of national electricity demand. For comparison, no other country has a single UHV line in full commercial operation, reports ChinaDialogue.com.
Here are some updates:
(1) There are about 30,000 kilometers of UHV DC power transmission lines under construction and in operation, the SGCC said.
The decision to use UHV transmission is based on the fact that China’s major energy resources are in the west and northwest, but huge consumption demands are in the east and south.
Compared with a traditional power grid, UHV transmission, especially UHVDC transmission, could largely reduce transmission losses as well as pollution to a manageable level. As a more economical technology for long-distance power transmission, using UHVDC transmission in China is a logical step forward.
(2) A west-to-east ultra-high voltage direct current (UHV DC) power transmission project is running smoothly in China, having transmitted over 100 billion kilowatt-hours of clean electricity.
The clean power has been carried from Xiluodu Hydropower Station in southwest China to east China's Zhejiang Province.
The 1,680-kilometer line started operations in 2014. During the peak summer season, it contributed up to 17 percent of Zhejiang's power, saving more than 30 million tonnes of coal and helping reduce about 85 million tonnes of carbon dioxide emissions.
(3) China's longest UHV power transmission line enters operation on June 25, 2017.
An ultra-high voltage direct current (UHVDC) power transmission line has officially entered operation in China, announced the State Grid Corporation of China (SGCC), which marks the longest UHVDC power transmission line for green energy currently in operation in China.
Energy will be carried from Jiuquan City in northwestern Gansu Province to Xiangtan City in central Hunan Province, and is expected to alleviate power supply shortages in five provincial level regions, including central Hubei Province, southwestern Chongqing Municipality and northwest China's Shanxi Province, said the SGCC.
Construction of the 2,383 kilometer-long line was approved by the National Development and Reform Commission (NDRC) in 2015. In one of China’s west-east electricity transfer projects, China invested 2.62 billion yuan (383.3 million US dollars) in its construction.
According to the SGCC, the project is capable of transmitting 13 million kWh electricity per second. The line is expected to meet up to 25 percent of Hunan Province’s energy needs, saving more than 18 million tons of coal and reducing carbon emissions by about 29.6 million tons, as well as 88,000 tons of sulfur dioxide emissions.
Despite these, there are challenges to UHV development in China, best addressed through more comprehensive power sector reforms.
These include power trade markets to make it easier for coastal provinces to buy power from the interior (and locally) at short-notice; measures to strengthen the competitive position of long-distance clean energy against local coal plants; and reforms to reduce disputes around grid planning between central government and provinces.
These reforms are at an early stage, pundits say.
More at HVDC 2019 China Conference
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| The Economist provides a diagram of operating and planned lines for UHVDC in China. |
UHV is defined as voltage of 1,000 kilovolts or above in alternating current and 800 kilovolts or above in direct current. It can deliver large quantities of power over long distances with less power loss than the more commonly used 500-kilovolt lines.
China is the global test bed for ultra-high voltage (UHV) transmission lines, a technology that can carry electricity across vast distances with much greater efficiency than the high voltage lines that you’re probably used to seeing.
Since 2006, it’s built 19 of these multi-billion-dollar lines, stretching almost 30,000 kilometres and supplying 4% of national electricity demand. For comparison, no other country has a single UHV line in full commercial operation, reports ChinaDialogue.com.
Here are some updates:
(1) There are about 30,000 kilometers of UHV DC power transmission lines under construction and in operation, the SGCC said.
The decision to use UHV transmission is based on the fact that China’s major energy resources are in the west and northwest, but huge consumption demands are in the east and south.
Compared with a traditional power grid, UHV transmission, especially UHVDC transmission, could largely reduce transmission losses as well as pollution to a manageable level. As a more economical technology for long-distance power transmission, using UHVDC transmission in China is a logical step forward.
 |
| Above lists UHV projects completed and under-construction. |
The clean power has been carried from Xiluodu Hydropower Station in southwest China to east China's Zhejiang Province.
The 1,680-kilometer line started operations in 2014. During the peak summer season, it contributed up to 17 percent of Zhejiang's power, saving more than 30 million tonnes of coal and helping reduce about 85 million tonnes of carbon dioxide emissions.
(3) China's longest UHV power transmission line enters operation on June 25, 2017.
An ultra-high voltage direct current (UHVDC) power transmission line has officially entered operation in China, announced the State Grid Corporation of China (SGCC), which marks the longest UHVDC power transmission line for green energy currently in operation in China.
Energy will be carried from Jiuquan City in northwestern Gansu Province to Xiangtan City in central Hunan Province, and is expected to alleviate power supply shortages in five provincial level regions, including central Hubei Province, southwestern Chongqing Municipality and northwest China's Shanxi Province, said the SGCC.
Construction of the 2,383 kilometer-long line was approved by the National Development and Reform Commission (NDRC) in 2015. In one of China’s west-east electricity transfer projects, China invested 2.62 billion yuan (383.3 million US dollars) in its construction.
According to the SGCC, the project is capable of transmitting 13 million kWh electricity per second. The line is expected to meet up to 25 percent of Hunan Province’s energy needs, saving more than 18 million tons of coal and reducing carbon emissions by about 29.6 million tons, as well as 88,000 tons of sulfur dioxide emissions.
Despite these, there are challenges to UHV development in China, best addressed through more comprehensive power sector reforms.
These include power trade markets to make it easier for coastal provinces to buy power from the interior (and locally) at short-notice; measures to strengthen the competitive position of long-distance clean energy against local coal plants; and reforms to reduce disputes around grid planning between central government and provinces.
These reforms are at an early stage, pundits say.
More at HVDC 2019 China Conference
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