The State Grid Corp. of China (SGCC), the country's biggest power supplier, said China was setting records by putting an 800-kV ultra-high-voltage (UHV) power transmission line into commercial operation.

The UHV line, linking Jinping in southwest China's Sichuan province with Sunan in east China's Jiangsu province, is a direct-current (DC) transmission project that has the world's largest power transmission capacity, longest transmission distance and highest transmission voltage, the SGCC announced.

The 2,059-km (1,280-mile) line can deliver 7.2 million kWh of electric power, up from the present record of 6.4 million kWh, by means of DC power transmission technology.

China invested a total of 22 billion yuan (US$3.5 billion) to build the line, which is also the third UHV power line put into operation by the SGCC. China approved the project in November 2008.

Similar power lines were previously developed only in Russia and Japan, but the technology was not widely used in these countries because of high costs and relatively weak demand.

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