Hydrogen, the most abundant element in the universe, is being looked at as a potential solution for decarbonizing major polluting sectors of the Welsh economy. A research briefing by Matthew Sutton from Senedd Research, Welsh Parliament, sheds light on the current state of the hydrogen sector in Wales. The briefing investigates existing hydrogen production sources in Wales and outlines ambitious proposals that aim to drastically increase hydrogen production in the country by the end of the decade. The briefing goes on to discuss the various applications of hydrogen in sectors like transport, industry, heating, and energy storage. It emphasizes the importance of developing hydrogen distribution and storage networks to support these applications effectively. Moreover, the briefing analyzes recent policy decisions made by both the Welsh and UK Governments regarding hydrogen and evaluates their potential impact on the sector's growth and adoption. Acknowledging the support provided by the Natural Environment Research Council (NERC) through a parliamentary fellowship to Matthew Sutton, the briefing highlights the significance of hydrogen as a potential game-changer in Wales' journey towards a more sustainable and decarbonized economy. With a positive sentiment towards hydrogen's role, the briefing sets a hopeful tone for the future of hydrogen in Wales.