For the first time, a US organisation is offering wind turbine certification. The respected Underwriters Laboratories Inc (UL) has announced it can now test and certify wind turbines to domestic and international safety standards. Wind turbine manufacturers can apply for certification to the International Electrotechnical Commission (IEC) 61400 series of standards and receive UL's globally recognised classification, says the organisation, based in Research Triangle Park in North Carolina. In addition UL can test and certify individual components of wind turbines. In November 1999, UL engineers completed a comprehensive training program on wind turbine technology run by National Renewable Energy Laboratory (NREL). To perform the certification, UL will work closely with the national Wind Turbine Technology Center, part of NREL in Golden, Colorado. UL is a private, non-profit organisation that has evaluated products for public safety for more than 100 years. More than 14 billion "UL Marks" appear on products each year and more than 17,000 types of products are tested at UL facilities world wide, it says.