the applicability of the scoring rules see below has also been simplified and adapted from the european union and norway to the whole of the oecd the more or less objective inputs concern the shares of different supply and demand categories ie for supply oil gas coal nuclear res and other for demand industrial use residential use tertiary use and transport use and the values characterising efficiency adequacy and reliability in conversion and transport based on the secondary energy carriers electricity gas heat and transport fuels figure displays the conceptual framework of and the elements considered in the overall sd index model