After graduating as an Engineer (Ecole Polytechnique and Ecole Nationale des Mines de Paris), Didier Holleaux started to work as an Engineer in the car manufacturing and oil industries. He then had a career in the French Civil Service which led him to the position of head of the departmental staff (“Directeur de Cabinet”) of the Energy Minister (1992-1993).

Didier Holleaux joined Gaz de France (merged in GDF SUEZ in 2008 and renamed as ENGIE in 2015), in 1993.

Since then, he held different managing positions in the transmission, distribution, and LNG businesses of the company. He also founded and managed the North Sea Exploration and Production (1997-2000) and managed the worldwide Exploration and Production of the group (2007-2015).

Since 1st of July 2015, he is Executive Vice President of ENGIE.

He is currently in charge of special projects, particularly in the field of renewable gases, gas supply, and external representation.

Since June 2021, he is President of EUROGAS, the European Gas Industry association.