GDF Suez S.A. is a French multinational energy company which operates in the fields of electricity generation and distribution natural gas and renewable energy. The world's largest utility after taking control of Britain's International Power the company was initially formed by the merger of Gaz de France and Suez on 22 July 2008. The firm also holds a 35% stake in Suez Environnement the water treatment and waste management company spun off from Suez at the time of the merger.
Key people are Gérard Mestrallet and Jean-François Cirelli.