While a number of pathway exercises have been carried out in literature with several, well-established modelling tools, challenges still exist in 1) combining multi-sectoral aspects and 2) communicating the insights from the scientific production.
1) REEEM has brought and will increase the experience on the set-up and use of wide integrated modelling frameworks. A framework of more than 15 multi-sectoral modelling tools has been established and the major challenges in linking them have been addressed, marking a step forward in integrated modelling. On one side, a solid block of models carries out a multi-sectoral impact analysis of energy transition pathways at the EU level. The assessment goes beyond state of the art in that it includes aspects related to 1) the impact of consumers choices of final heating and transport technologies on the velocity of the transition. A survey-based highly granular study was linked to the TIMES PanEU energy system model, marking great advancement in the state of the art scientific knowledge; 2) the health impacts of energy-related emissions, with high spatial granularity; 3) key potential innovations in storage and renewable energy technologies, as assessed by EIT InnoEnergy with a wide network of industrial stakeholders; 4) impacts on a regional and sectoral scale (such as impacts of intensive use of biomass on ecosystem services). The final insights from the framework, especially those linked to the cross-sectoral risks and opportunities of decarbonisation, were communicated at scientific conferences, at the EMP-E, in high-level meetings with EC's DG Directors and in a final research and policy agenda.
2) Advanced and open source communication tools to close the gap between science, society and decision making have been created. The first fully open source EU28+2 Engagement Model was published, aiming to represent in a simplified yet comprehensive fashion the challenges of the energy transition and mirroring key dynamics of the entire modelling activity of REEEM. The model has been and will be used as research infrastructure by a large open modelling community and in national modelling activities. A serious Game has been published, which further exposes the key dynamics of the energy transition. Finally, the contextualisation of the entire REEEM effort within the large EU modelling landscape is made possible by the Energy Modelling Platform for Europe. Created by REEEM in 2017, it has turned into a large collaboration platform between LCE21 projects and others, with inputs by DGs of the European Commission, and culminating in an annual event. The REEEM Consortium dares to highlight that this event is bringing forward and unprecedented effort to join efforts, provide joint messages by R&I actions on the energy transition and highlight room for improvement in energy modelling research and funding.