The three central topics will be Renewable Energy, Energy Efficiency and Systems and Grids. The EST 2015 will be an opportunity for researchers and engineers from all over the world to meet and discuss their latest research findings and developments in energy systems. The two established energy conferences, EnMat (3rd International Conference on Materials for Energy ) and E2C (4th European Energy Conference) , will form part of the EST 2015. Operating as the scientific partner of EST 2015, the KIT Energy Center of the Karlsruhe Institute of Technology (KIT) is structuring a further part of the conference programme. Around 800 international participants are expected to attend.