Esteyco has just finished the geotechnical survey of the first greatest wind farm in Saudi Arabia, Dumat Al Jandal wind farm. This wind farm will be composed by 99 WTG and it is located in a plateau in Al Jouf region. Since mid-February, a team integrated by 7 drilling teams together with geophysical technicians have worked in the area with the permanent on-site supervision of Esteyco, performing more than 2000 meters drilling. A great number of geophysical tests, mechanical trial tips and laboratory tests, together with the inspection of slopes and outcrops, will complete a comprehensive geotechnical study as a basis for the successful development of a quality engineering project.