Workers debug the equipment at the wind power base in Jiuquan City, northwest China's Gansu Province, December 8, 2009. The Jiuquan wind power base achieved the landmark capacity as the result of the installation of a 200-megawatt wind power unit in Yumen, a city under the jurisdiction of Jiuquan. [Xinhua]

A truck runs by the wind power base in Jiuquan of northwest China's Gansu Province in this Nov. 30, 2009. [Xinhua]