Facilitating energy transition through active citizen participation- Innovation in green energy solutions and their usage play a key role in climate change mitigation. Energy citizenship refers to active public participation in clean energy transition, for example through behavioural change and renewable energy adoption, the collective effect of which could lead to significant carbon emissions’ reduction. Unfortunately, there are many barriers against energy citizenship. The EU-funded GRETA project will conduct research to develop models and frameworks that reveal factors impacting both individual and collective energy citizenship actions. The results will be utilised not only for developing energy citizenship contracts that support the transition goals within energy communities, but also for producing recommendations aimed at improving the policymaking process towards stimulating energy citizenship.