The transition to a competitive low carbon economy is a prime objective of EU energy policy. Increasing the share of electricity generated from RES is essential for reaching this target. Indeed, significant RES-E generation capacity additions are planned all across Europe. In Northern Europe (including the Nordic and Baltic States, Germany, the UK, Poland, the Netherlands and Belgium) a large part of this new capacity will be variable wind energy. As a result, the challenge lies in integrating variable RES-E in the North European electricity grid, while guaranteeing security of electricity supply and fostering EU competitiveness. Investing in new transmission infrastructure that would allow for more electricity trading in Northern Europe could make an important contribution to coping with this challenge and benefit all three dimensions of the energy policy triangle.