Red Eléctrica Corporación S.A is a multinational business group of Spanish origin that operates in the international electricity market as an operator of the electricity system. Its most important subsidiary, Red Eléctrica de España (REE) operates in the Spanish electricity market and accounts for 93% of the group’s revenues (2017). Its mission, as a system operator, is to ensure the proper functioning of the electricity supply system and to guarantee at all times the continuity and security of the electricity supply. REE manages the entire electricity transmission network (high voltage), but does not distribute electricity (medium/low voltage). SACI collaborates with REE in the supply of the full range of transducers and digital instrumentation, making its R&D available for new developments that meet future needs.