A hydraulic support, developed by Jincheng Anthracite Mining Group, is shown at the Fourth China (Taiyuan) International Energy Industry Expo in Taiyuan, capital of coal-rich Shanxi province, Sept 16, 2012. [Photo/Xinhua]

Visitors take pictures in front of a low-carbon hydroelectric station model at the Fourth China (Taiyuan) International Energy Industry Expo in Taiyuan, Shanxi province, Sept 16, 2012. [Photo/Xinhua]