Électricité de France S.A. (EDF; Electricity of France) is a French electric utility company. Headquartered in Paris, France, with €65.2 billion in revenues in 2010, EDF is the world's largest producer of electricity, primarily from nuclear power. Its 58 active nuclear reactors (in France) are spread out over 20 sites (nuclear power plants). EDF-DTG, the EDF group internal engineering unit on monitoring, implements its expertise in measurement diagnosis and prognosis. The Unit advises the operators of electricity production
systems and the owners of plants on safety and performance issues. EDF-DTG operates within the EDF group in France and around the world for the hydraulic, nuclear, thermal and renewable energy power plants. EDF-DTG participates in innovative projects, such as the EPR (European Pressurized Reactor) for the nuclear sector and works on development in methods and tools for the future.