A system of guarantees of origin is a necessary complement to the promotion and trade of electricity from renewable energy sources. The PWMSP project has elaborated a benchmark to register guarantees of origin on the basis of experiences of European Union (EU) countries. The benchmark needs to be considered, discussed and validated by all Mediterranean Partner Countries (MPC), as it will facilitate future developments of national systems of guarantees of origin suitable for cooperation at the regional level. The workshop contributed to the exchange of best practices between MPC and enhanced regional the cooperation at expert and institution levels.