REN - Redes Energéticas Nacionais, SGPS, S.A. is a leading Portuguese energy infrastructure company responsible for the transmission of very high-voltage electricity and high-pressure natural gas across mainland Portugal. It operates as the concession holder for the National Electricity Transmission Grid (RNT) and the National Natural Gas Transportation Grid (RNTGN), ensuring uninterrupted supply, balance between energy demand and generation, and equal access for market participants including generators, distributors, and consumers. The company manages overall technical operations of the National Electric System, plans and invests in grid expansions via regulated Development and Investment Plans, and supports the energy transition through enhanced renewable integration and interconnections, such as with Spain. Additionally, REN oversees a liquefied natural gas regasification terminal at Sines, telecommunications services, and innovative projects like ocean wave energy pilots. Founded in 1994 and headquartered in Lisbon, it employs over 700 people committed to sustainability, safety, and EU energy goals, playing a pivotal role in Portugal's secure and efficient energy market.