Many modeling efforts have been undertaken to gain better insight in the interactions between the energy sector and the rest of the economy. One of the first attempts was made with ETA-MACRO [1], consisting of a macro-economic model linked with an energy model, that had its main focus on electricity generation. One of the latest developments in that field is the ZENCAP model [2]. It is based on a multi-sector economy model consisting of an input-output table and a large number of econometrically estimated equations, e.g. for investments, energy demand and employment.