MaREI’s Advanced Fuels in the Circular Economy Group focus on renewable gaseous biofuel production (biohydrogen and biomethane) from 2nd generation biofuel substrates such as wastes, agricultural residues and lignocellulosic energy crops, and 3rd generation biofuel substrates such as macro-algae (seaweed) and micro-algae. Research covers biological and thermochemical bioenergy pathways. The group investigates a range of digestion applications at lab scale including for innovative technologies such as Power to Gas, demand driven biogas and novel biogas upgrading technologies. Fundamental and applied aspects of biomass gasification, pyrolysis, torrefaction, combustion and methanation are also investigated. Work includes for desktop analyses such as chemical kinetic modelling, process simulation, geographic specific bioresources, Life Cycle Analysis, sustainability analyses and techno-economic studies. The research group’s work facilitates the development of roadmaps, which describe how Ireland can initiate a green gas industry, which would contribute to mandatory renewable energy targets for renewable heat and transport fuel.