TEESLab is the energy modelling, strategy and policy analysis laboratory of University of Piraeus. Their research focuses on the techno-economic analysis of energy systems, and the support of effective energy and climate policy design. They employ a collection of approaches and tools to enable the quantitative and the qualitative assessment of critical issues governing the future evolution of the energy system. Their main strength is the combination of senior highly-experienced experts and younger, highly skilled and motivated researchers, all working on new ways to integrate quantitative modelling with systems analysis and management methods. TEESLab has been contributing to international research by participating in an increasingly more diverse range of EC funded research and innovation projects.