OPECST received a request from the Senate Economic Affairs Committee for a study on “the numerous questions arising from the development of a hydrogen sector, ranging from production of the gas, its storage and transport, to its final use”. Following an enquiry which led them to meet with close to two hundred experts directly involved in the energy uses of hydrogen, as well as in wider energy matters, Laurent Kalinowski and Jean-Marc Pastor sought to answer these questions in their report, while situating their work in the wider context of current thinking on energy transition. The report was unanimously approved on December 18 2013.