These contributions take in account the degree of diversity and supply origin of different energy carriers, the efficiency of energy consumption by main the economic sectors, and the state of the electricity generation infrastructure. The values of weights determining the relative contribution of the demand, infrastructure and supply branches are close to those used in the original S/D model, where they were adjusted to reflect the percieved vulnerability of the branches. A higher weight indicates increased vulnerability. As described below, a maximal score 100 refers to a country with low energy intensity, developed electricity generation infrastructure, perfectly diversified primary energy sources, with the latter all domestically produced or imported from trustworthy sources. On the contrary, a score 0 corresponds to a country with low energy efficiency, an electricity capacity unable to satisfy the peak load, and importing the totality of the energy carriers from unreliable sources.