IEA Annex 83 aims to develop an in-depth definition of Positive Energy Distric (PED) as well as relevant technologies, planning tools, and decision-making process. PSI contributes to subtask C Organization Principals and Impact Assessment, which will systematically review the sustainability and impact assessment methodology and create planning tools that can be applied to assess PEDs, and in particular on the environmental assessment. IEA Annex 83 has a great synergy with the work package 9 in the H2020 project ATELIER, which focusses on monitoring, impact assessment and evaluation of the positive energy district.