This economic sector includes energy systems: energy efficiency and decarbonisation (buildings, industry, Carbon Capture, Utilisation and Storage (CCUS), Hydrogen), energy storage (batteries), renewable energies, networks (electric networks, software resources, cybersecurity), fossil energies, engineering. It also includes the French nuclear industry, with all the players involved in the production of nuclear energy: activities relating to the various phases of the industrial cycle of an electricity production plant, and activities relating to the fuel cycle.