REN - Redes Energéticas Nacionais, SGPS, S.A., together with its subsidiaries, engages in the transmission of electricity and natural gas in Portugal. It operates in two segments, Electricity and Gas; and Telecommunications. The company operates as a national electricity transmission network; purchases, sells, imports, and exports electricity and natural gas; manages a concession to operate a pilot area to produce electric energy from ocean waves; and operates a telecommunications network. It also operates liquefied natural gas terminal maintenance and regasification facilities; and manages projects and ventures in the natural gas sector. In addition, the company provides underground storage development, maintenance, and operation services; natural gas transport and management services; and distributes natural gas, as well as communication and sustainability, marketing, business management, business development and consulting, and IT project services. Further, it invests in assets, shares, companies, and associations; transmits and transforms electricity in Chile, as well as participates, finances, collaborates, and conducts management of companies; and manages back offices. The company was founded in 1994 and is headquartered in Lisbon, Portugal.