Jean-Yves joined Electricité de France (EDF) and launched the first project devoted to the climate issue in 1990 and was head of climate policy from 2005 to 2016. He was heavily involved in the design of the EU ETS directive (organising with Eurelectric real carbon trading simulations and taking an active part in the official consultation launched by EC) and respective compliance efforts at EDF. He started working with IETA when the latter was formed in 1999.