Oujen endeavours to encourage sustainable development within the energy sector and transport sector through public engagement activities, social media campaigns and the Energy Discussion Forum which he co-founded in 2013. He organised an educational engagement activity at the FCH2 2016 conference, promoting hybrid electric vehicles and hydrogen technology. He competed in the 2016 Shell Eco-Marathon with the Imperial College London team, assisting in the development of the tri-generation hybrid drive system (fuel cell-batter-supercapacitor).
Oujen has a fundamental love of motorsport and has entered local amateur rally events within Wales as driver and co-driver. He has competed at the county and University level in rugby and American football. Oujen was awarded his 2nd Dan Black belt in traditional Kempo Karate in 2012 and has since received instructor status.