Since 1996 windtest grevenbroich GmbH (wtg) offers a wide range of accredited services for the windenergy sector like measurements of power performance, loads, electrical characteristics and acoustic noise. Furthermore wtg supports windpark developers, banks and insurance agencies with services like site assessment, noise prognosis, shadow cast prognosis and technical inspections. Moreover wtg is the operator of an inland test site in Grevenbroich, Germany.