HEIs are well placed to engage with local communities, and can connect students with organisations through several pathways, such as volunteering opportunities, placements, internships, or projects. The University of the West of England, Bristol (UWE), the University of Bristol and their respective Students' Unions have been working in partnership with the city and local communities, using HEFCE Catalyst funding to promote student involvement in sustainability activity during Bristol's year as European Green Capital. The Green Capital Student Capital project has created a broad programme of citywide impact through mobilising the enthusiasm of the city's student body. It delivered a wide-ranging programme of engagement in city sustainability and in so doing developed skills, knowledge and attributes in the student body that support the development of graduate attributes and a more sustainable lifestyle. The project demonstrates how institutions can collaborate across cities and communities to have internal and external impacts for sustainability.