Energy Systems

Ultimate back-up diesel generators

Eiffage √Čnergie Syst√®mes

A different conception of nuclear safety

Supply, installation and operational maintenance

In order to strengthen the safety of nuclear power plants, EDF decided to equip its units with so-called ultimate back-up diesel generators. The programme combined engines and alternators, electrical and mechanical auxiliary equipment, sensors, security and air treatment systems and a control centre. Leading a consortium of companies, Eiffage Énergie Systèmes - Clemessy won the contract to supply, install and maintain the generators in operational conditions.


After two years of studies and qualifications carried out by the entity – design, electromechanical supplies, installation of electrical equipment and control centre and of the generators –, followed by three years of assembly and testing, the ultimate back-up diesel generators were fitted in all of the 900 and 1450 MW levels of the French nuclear fleet, for a total of 38 tranches.