AbstractThis paper presents the major outcome of the IEA Hydrogen Implementing Agreement (IEA-HIA) Task 23 “Small-scale reforming for on-site hydrogen supply”. The task is briefly described, including the three sub-tasks: harmonized industrialization, sustainability and renewables and market information.An exclusive network of worldwide suppliers of reformers as well as gas companies has contributed to the discussion, evaluation and harmonization of on-site production technologies and optimal use of feedstock. The ambition has been to contribute to harmonization of capacities and improved system performance to facilitate both reduced system and production costs.