Code showing the application of some exploratory data analysis techniques as a means of supporting the ex post assessment of the energy policy instrument mix that has been in effect in the Greek power market. The code corresponds to the analysis presented in http://x-energymarkets.blogspot.gr/ for presenting the work that is currently being carried out in the FP7 funded project APRAISE (Assessment of Policy Interrelationships and Impacts on Sustainability in Europe, http://apraise.org)).