Its sole purpose is to allow for better policy making in the electricity sector. The externalities of energy provision in different policy areas such as grid-level system costs, atmospheric pollution or climate change are thus considered one by one. The alternative of considering them together, with the help of a computable general equilibrium (CGE) model, economy-wide input-output models or a macro-econometric model, would have diminished the transparency and readability of findings which are first and foremost addressed to policy makers.