Xiamen Changelight Co Ltd

With over 160 companies falling under the coverage of the Index and with a combined market capitalisation of over 2.2 trillion Renminbi (US$370 billion), the China CleanTech Index presents a picture of the Chinese cleantech industry's growth in a single measure.

The best performing sub-indices for the month were the China Efficiency Index with a 28.9% gain and the China Waste Index with a 19.8% gain. The two weakest sub-indices through May were the China Solar Index with 24.2% loss on the back of the issues at Hanergy and the China Hydro Index with a 5.7% loss.