The Swiss company SGS SA opened the WETC in June at the Tianjin Economic and Technological Development Area in the north-east of the country. At the WETC, the natural frequency, the statics and the material fatigue, as well as other characteristics of the rotor blades can be tested. The centre also offers advice on other questions relating to wind energy technology. The WETC has been certified by China Metrology Accreditation.