RAP has developed and presented to regulators, member states and stakeholders an overview of the key elements of European electricity market integration in Europe and how decisions in the various areas of integration may act either to advance–or interfere with–Europe’s power sector decarbonisation agenda. RAP Principal Meg Gottstein and co-author Philip Baker from University of Exeter have provided briefings and Q&A forums on these issues in Brussels, in coordination with the European Climate Foundation. This is the Briefing Paper that provides a fuller context for policymakers, regulators and interested stakeholders for considering the regulations that are being developed to implement European market integration. Subsequent advisory notes on the specific draft regulations proposed under the European “framework guidelines and grid codes” development process described in this document are also available on RAP’s website.