This work is part of INELFE project, which consists of a new underground electricity interconnection line and crossing the Pyrenees through the massif of Albera between Spain and France of 64.5 km. in length, linking the two converter stations Baixàs and Santa Llogaia. The work consists of five buildings, foundations for Seven main transformers and auxiliary service transformers, rolling vials, various switchgear foundations, drainage system and electrical raceway ten concrete block houses, oil collection tank, metallic structure for chiller system and security perimeter fence.