This report presents the findings of the social science work package of the Triple Carbon Reduction project, a consortium led by Anglian Water and funded by the Water Breakthrough Challenge which aims to develop and demonstrate new technologies in wastewater processing to reduce process emissions, together with energy efficiency and renewable energy benefits. To do this the TCR project is seeking to generate green hydrogen from electrolysis of final effluent in one of Anglian Water’s wastewater treatment facilities using a novel biological treatment process, called MABR (Membrane Aerated Biofilm Reactor).