The report covers the role of gas infrastructure, with a focus on transport infrastructure: pipelines, transmission, distribution. It canvasses this infrastructure being used to transport natural gas (as it largely does today) and other energy-related gas streams that may develop in the future (such as biomethane, hydrogen and carbondioxide) to deliver an efficient, orderly and resilient energy transition. This report represents a potential perspective as to how the energy transition may evolve, and is not a forecast. Indeed, other eventualities may unfold based on a range of factors.