Red Eléctrica Corporación operates outside Spain through its subsidiary Red Eléctrica Internacional (REI). Its aim is to capitalise as far as possible on the company's experience. REI's works mainly in the area of investment in electricity transmission assets, basically in Bolivia and Peru, and provides assistance and consultancy services.
Website of Transportadora de Electricidad de Bolivia: www.tde.com.bo 
.
Website of Red Eléctrica del Sur: www.redesur.com.pe .
Red Eléctrica Internacional is currently working through the Bolivian company Transportadora de Electricidad, S.A. (TDE), in which it has a 99.94% stake and the Peruvian company Red Eléctrica del Sur, S.A. (REDESUR), in which it controls 33.75%.
In 2002, Red Eléctrica Internacional acquired 99.94% of the stock in the Bolivian company (TDE), owner and operator of Bolivia's national grid, Sistema Interconectado Nacional (SIN), which caters to 85% of the domestic market. It has an open-ended licence and operates approximately two thousand kilometres of lines and 19 substations. The acquisition marked a major increase in the group's international expansion, reinforcing its position in the Andean area, where it already had a stake in the Peruvian company Red Eléctrica del Sur, S.A. (REDESUR).
In 1999, REDESUR, the consortium led by Red Eléctrica, won a private sector concession contract for reinforcement of the electricity transmission systems of Southern Peru. The system used is what is known as a BOOT-type contract (Build-Own-Operate-Transfer) with a term of 32 years - 2 years of construction plus 30 years operating the resulting system. Red Eléctrica is the leader of the concession and its strategic operator.