For many years, the European Commission has been a champion for the environmental acquis Communautaire of the EU. In December 2019, it reinforced this role with the introduction of the EU’s new...Show moreFor many years, the European Commission has been a champion for the environmental acquis Communautaire of the EU. In December 2019, it reinforced this role with the introduction of the EU’s new growth strategy: the European Green Deal. Its cornerstone is the first European Climate Law that binds the Union and its member states to climate neutrality targets. The negotiations to adopt this policy proposal happened via trilogues between the Commission, the Council and the Parliament. This research aims to open the doors of this secluded venue of decision-making to better understand the Commission’s role in them. It analyses the role of the European Commission in trilogue negotiations by using two theories: agenda-setting and politicisation. Process-tracing and document analysis were used as the main data collection and analysis methods. The analysis shows that the Commission uses a two-step strategy to be able to influence trilogues. During agenda-setting it uses its informal power to strategically use public support and the support of other institutions and its expertise to shape the future outcome of negotiations and draw on its political resources to act as a policy entrepreneur. After the proposal is on the table, the Commission uses (de)politicisation strategies to influence the negotiations and their outcome. This research shows that Commission’s influence on trilogue negotiations is dependent on its ability to use strategically its political and informal power during all stages of decision-making.Show less