The Energy Union is a central project of the European Union. The aim is to build an integrated energy market that provides secure, affordable and sustainable energy to all European citizens. On 10 June 2015, Katharina Umpfenbach discussed options for implementing the Energy Union with stakeholders from central and eastern Europe at a conference jointly organised by the Prague Institute for Global Policy (glopolis), the Delegation of the European Commission to the Czech Republic and the Heinrich Böll Foundation Prague. In her contribution, Katharina Umpfenbach emphasised the opportunities that arise if decarbonisation is put at the heart of the Energy Union. Renewable energies and energy efficiency have enormous potential to replace costly energy imports and drive innovation in the EU.