Abstract
It is impossible to understand the EU without a careful study of its key institutions and how they work. This chapter examines the six key institutions of the EU: the European Commission; the Council (of ministers); the European Council; the European Parliament; the Court of Justice of the European Union; and the European Central Bank. The chapter discusses the structures and formal powers of the six institutions and how these powers have evolved in practice over time. While it may be tempting to regard EU institutions as dry and complex, they are also dynamic organisms exercising a unique mix of legislative, executive, and judicial power. The chapter explains why these institutions matter in determining EU politics and policy more generally, focusing on three central themes: the extent to which the EU is an experiment in motion; the importance of power sharing and consensus; and the capacity of the EU structures to cope with the Union’s expanding size and scope.