TAIYUAN, April 15 (Xinhua) -- China Taiyuan coal transaction price index stood at 140.43 points, up 0.26 percent week on week.

The index, released by China Taiyuan Coal Transaction Center (CTCTC) based in Shanxi, a coal-rich province, reflects the coal price levels and changes in the main production areas of China.

Analysts said the purchase demand of China's main power plants, cement and building materials producers had slightly increased over the past week.

In addition, the overhaul of the Daqin rail line, the main coal transportation line from Datong to Qinhuangdao, cut out electricity supply in several sections, which caused the supply of high-quality coal in northern ports to tighten and coal prices to edge up.

With more than 10,000 registered coal traders, the CTCTC is the largest coal trading center in China.