Propergol is the main sonic project of Jérôme Nougaillon, director of the Hermetique and Gazoline record labels, whose side-projects include Sea-Green Series, Wrong Number, Cosmos Entropy, and Vargtimmen. Propergol is typically industrial/power electronics, whereas the side projects are typically ambient and experimental. Jérôme Nougaillon's production abilities are sought after; for instance, he was chosen by industrial/power electronics mainstays Genocide Organ to re-master their album Remember for its reissue.