The Accelerathon as a catalyst for open innovation in urban sustainability

This paper examines the Accelerathon as an innovative methodology for urban sustainability, contrasting its structured, policy-aligned approach with conventional hackathon models. Through a case study of the Horizon Europe-funded RES4CITY project, we demonstrate how the Accelerathon’s extended timeline (20 months), embedded policy training, and mentorship framework address key limitations of hackathons, including low implementation rates (<15%) and weak policy integration. The methodology aligns with EU priorities (Green Deal, REPowerEU) while fostering competencies identified in the European Sustainability Competence Framework (GreenComp). Results show improved solution viability (57% pilot conversion) and participant skill development (89% self-reported competency growth), though challenges remain in resource-constrained contexts. The study contributes to urban innovation literature by validating a hybrid model that combines open innovation principles with structured acceleration phases. We identify three research priorities: (1) longitudinal impact assessments of deployed solutions, (2) comparative policy analyses across governance systems, and (3) pedagogical studies on skills retention. These findings offer practical insights for policymakers designing urban innovation programs and researchers investigating sustainable transitions.