The present study by the European Commission looks into assumptions and results of different deep decarbonisation outlooks that stem from entirely independent studies, frameworks and storylines. A first goal of the present analysis is to support with evidence the clean and low carbon technology solutions and innovation that are needed for 2030 and 2050. By identifying the role of technological evolution within the transition outlooks as well as possible technology gaps, the study outlines the directions of investment both in technological development and infrastructure. Ultimately, the aim of comparing the different outlooks presented in this report is to identify and bring together ideas and findings that are common regarding key technologies and policies and which may offer useful guidance ahead of the EU Green Deal.