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REN - Redes Energéticas Nacionais, SGPS, S.A. is a Portuguese utility company established in 1994, specializing in the transmission of electricity and natural gas. The company operates the National Electricity Transmission Grid and the National Natural Gas Transportation Grid, overseeing their planning, construction, operation, and maintenance. REN also manages a liquefied natural gas (LNG) regasification terminal in Sines, Portugal, facilitating LNG storage and transportation. Additionally, through its subsidiary Rentelecom, REN provides telecommunications services, including infrastructure management and fiber optic rentals. Headquartered in Lisbon, Portugal, REN's strategic role in managing critical energy infrastructure positions it as a key player in ensuring the country's energy supply stability.

Southern is one of the largest utilities in the US. The company serves 9 million customers with vertically integrated electric utilities in three states and natural gas distribution utilities in four states. It owns 46 gigawatts of rate-regulated generating capacity, primarily for serving customers in Georgia, Alabama, and Mississippi. Subsidiary Southern Power owns 13 gigawatts of natural gas generation and renewable energy across the US and sells the electricity primarily under long-term contracts.