TAIYUAN, May 13 (Xinhua) -- China Taiyuan coal transaction price index stood at 139.79 points, down 0.08 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. It is published every Monday.

Analysts said that the average daily coal consumption of China's main power plants continued to decline, resulting in insufficient coal demand. The transaction of power coal in northern ports fell short of expectation and coal prices edged down slightly.

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