Siemens Gamesa Renewable Energy (SGRE) is a world leader in the development and production of multi-megawatt wind turbines for use on land and at sea. The company aims to guarantee reliable and robust machines, capable of fulfilling customer expectations worldwide, even in the harshest weather conditions. To set up and perform a series of extensive cold start tests on a gearbox, a critical component of a wind turbine, the company relied on Sirris expertise and the large climate test chamber infrastructure set up as part of the OWI-Lab project.