The present document introduces the results of a study carried out on the technical and commercial prefeasibility of integrating a Battery Energy Storage System (BESS) into an existing PV plant. The PV plant is a 15 MWDC / 10.5 MWAC extension of the existing 30 MWAC Aura Solar 1 PV plant near La Paz in Baja California Sur, Mexico, that is managed by Gauss Energía.