Energy communities have started to grow and spread all over Europe during the last years. The fact that the EU has established a supporting legal framework – through the Clean Energy for All Europeans Package (CEP) – specifically the Internal Market for Electricity Directive (EU) 2019/944 (IMED) and Renewable Energy Directive (EU) 2018/2001 (RED II). Specifically, citizen energy communities – i.e. communities established to produce, exchange and consume energy among their members – have thrived throughout Europe with some EU regions intending to become one citizen energy community (e.g. in the case of Burgenland in Austria) relying primarily on self-produced renewable energy. This type of communities would certainly offer a lot of benefits if established across borders. First the community building element would strengthen trust and interest sharing as well as social and economic bonding across borders. Second it would increase energy supply and stability of energy grids – especially in remote regions, where closing the grids across borders may actually increase energy security and help fighting energy poverty (regardless of the energy type – electricity, heat or gas). – The forthcoming “Handbook on Cross-border Energy Communities” (as commissioned by DG REGIO) will provide hints on how to establish and manage much cross-border energy communities.