Daniel Huppmann, doctoral student at the DIW Graduate Center since October 2011 and Research Associate in the department of Energy Transportation Environment since October 2012, successfully defended his dissertation Strategic Behaviour in Energy Markets in June 2014 at TU Berlin. The dissertation investigates several topics from energy economics where market power and strategic behaviour plays an important role (crude oil and natural gas markets, investment in electricity networks). The strategic interaction between different players is formulated mathematically using game theory and then solved for equilibrium solutions applying numerical methods from Operations Research.