As part of the European energy policy goals of sustainability, security of supply and improved competitiveness, the share of Renewable Energy Sources for Electricity (RES-E) is rapidly increasing. The Belgian national renewable energy action plan to comply with the EC renewable energy directive (2009/28/EC) estimates the installed capacity of wind power at 4320 MW towards 2020. This is expected to account for a yearly generation of 10.5 TWh, being 9% of the reference electricity demand scenario for 2020. The general objective of this project is to study the potential for massive wind integration in Belgium. Technical, economic and regulatory boundaries for a reliable and efficient integration in the power system are identified, together with necessary measures to transcend them.