After the investigation of more than 450 solar plants in different countries of the world and more than 35 GW studied, we have updated the Technical Specifications for Geotechnical Studies in Photovoltaic Plants. This document includes the tests that are currently most demanded for geotechnical design and protection against corrosive environments. In addition, the recommendations for the design of a correct geological and geotechnical research campaign for new photovoltaic solar plants are reviewed. You can download here.