This report presents a sustainability assessment of a link for transfer of residual heat from the chemical industries in Stenungsund to the district-heating (DH) systems of Kungälv and Gothenburg. It is part of the output from a package of interrelated projects involving researchers from Chalmers University of Technology, SP Technical Research Institute of Sweden, and IVL Swedish Environmental Research Institute. A consortium of Stenungsund industries, DH companies and other potential stakeholders are also involved in as partners and co-funders of the projects. The Swedish Energy Agency participates as external co-funder. A sustainability assessment can address different types of questions, for example: 1. Does the DH link make it easier to reach a sustainable society? 2. Does the DH link in itself improve the environmental, economic and social aspects of society? The first question is about to what extent opportunities for sustainable solutions arise or disappears as a result of the link. The answer to this question is at least partly known at the start of the project: a DH link is in principle likely to make it easier to reach an environmentally sustainable society, because the use of residual heat in the long term reduces the need for other energy sources. The main purpose of this sub-project is to respond to the second question, which is about foreseeable consequences of the specific DH link on the economic, environmental, and social performance of society. This question is much more complex. It requires that the assessment considers the case-specific local and regional conditions but, at the same time, is broad enough to take into account important and foreseeable impacts regardless of where in society they occur. This report is only available in English.