Europe has the ambitious goal of becoming the first climate neutral continent by 2050. The Green Deal and the EU Climate Law are first concrete steps. The current economic challenges are also an opportunity to accelerate decarbonisation and to create a fairer society and a more competitive economy. In 2021, the conference - which attracts over 400 participants from over 50 countries each year - shows how we can make a green recovery happen in practice and how energy efficiency as an investment engine can contribute to this deep transformation.