Final Report of ENERGETIC (ENergy-aware hEteRoGenEous compuTIng at sCale), a sandpit project as part of the UKRI Net Zero Digital Research Infrastructure Scoping Project. The ENERGETIC project had the aim of testing whether the use of heterogeneous architecture could significantly reduce the energy-to-solution and thus the energy consumed by UKRI digital research infrastructures. The report summarises the key findings and recommendations moving forward from ENERGETIC in working towards a roadmap for carbon neutrality in the UK's digital research infrastructures.