In response to the increasing demand for sustainable supply chains, companies need to trace, manage and assess their energy and carbon emissions by incorporating a life cycle perspective. Recent studies in the field of Information Systems (IS) have argued that information systems can contribute to more sustainable supply chains by supporting energy and carbon management. Mindful of this potential, a new class of information systems emerges, the Energy and Carbon Management Systems (ECMS). In our study, we focus on this specific class and aim to shed light on their implementation process and any related underlying phenomena in the supply chain. By deploying and demonstrating an ECMS artefact in different settings involving a retail chain and a multinational manufacturing company in the fast moving consumer goods sector, we identify a set of implementation issues such as poor data quality, data inconsistencies, and various data granularity levels. We conclude by formulating a set of recommendations that will guide both practitioners and researchers in developing and implementing energy and carbon management system.