The Implementation Plan describes the details of the most urgent R&I needs to be tackled through the European Commission and national R&I work programmes and calls (notably Horizon Europe Multiannual Framework). The ETIP SNET proposed Project Priority Concepts based on the 9 High Level Use Cases (as defined in the ETIP SNET Roadmap 2022-2031) intending to underline the urgency of realising the transformation of today’s energy system through concrete R&I projects into the needed (partially) renewable energy system of 2031 and the fully CO2-neutral energy system of 2050 as the ultimate goal.