Enagas is the Technical Manager of the Spanish Gas System and the main carrier of natural gas in Spain. It is also certified as independent TSO by the European Union, which homologates the company to gas transmission network operators of other European countries.

The company's main mission is to ensure competition and security of the Gas System in Spain. It has nearly 11,000 km of pipelines throughout the Spanish territory, three underground storage facilities located in Serrablo (Huesca), Gaviota (Vizcaya) and Yela (Guadalajara), and four regasification plants: Barcelona, Huelva, Cartagena and Gijón. It also owns 40% of the Bilbao regasification plant. Enagás terminals in Spain have 2,556,500 m³ of LNG storage capacity and an output capacity of 6,250,000 Nm ³ / h.