This workshop is the 3rd POLIMP Stakeholder Workshop. The event is hosted by the  Centre for European Policy Studies (CEPS) at their premises in Brussels, Belgium. The main objective of the workshop is the discussion on market mechanisms, particularly the EU ETS, the flagship of the EU climate change mitigation measures since 2005. Τhe workshop focuses on the assessment of economic impacts on the cost-effectiveness of the EU ETS, increasing harmonisation in the implementation of the EU ETS, and national stakeholders’ views on how the 2030 framework will influence the political support for the EU ETS.