Siemens Energy has secured a contract worth approximately EUR250m ($367.1m) from China Southern Power Grid Co to supply components for two electricity transmission projects in southern China.

Commissioning of the high-voltage direct-current (HVDC) transmission systems, Nuozhadu-Guangdong and Xiluodu-Guangdong, is scheduled for 2013.

The Nuozhadu-Guangdong project will have a transmission capacity of 5,000MW at a DC voltage of ± 800kV, while the Xiluodu-Guangdong project will have an overall capacity of 6,400MW at ± 500kV.

For the Nuozhadu-Guangdong bipole system, Siemens together with its Chinese partners will supply the converter valves with direct light-triggered power thyristors both for the sending station in Puer in the province of Yunnan and for the receiving station in Jiangmen in Guangdong province.

The transmission distance of this project is 1,451kms, and the order also includes key components for the HVDC system instrumentation and controls, the 800kV components for the stations’ DC switchgear, and the supply of eight 800kV converter transformers.

For the Xiluodu-Guangdong project, Siemens will supply the converter valves for the sending station in Zhaotong and for the receiving station in Conghua of Guangdong province.

The transmission distance of this project is 1,286kms and Siemens will also supply equipment for the system’s DC section.

The HVDC links will transmit hydro power to the megacities such as Guangzhou, Jiangmen, Dongguan and Shenzhen.