The study of the interactions between the energy sector, its effects on the environment and the corresponding impacts on a national economy must explicitly address multiple, conflicting and incommensurate aspects of evaluation. Multiple objective programming models enable the decision makers to rationalize the comparisons among distinct alternative solutions, providing them with a better perception of the conflicting aspects under evaluation and the ability to grasp the tradeoffs to be made. Reference point approaches provide a framework to aid decision makers to search for “satisfactory” efficient solutions. Moreover, it is possible to interpret the degree of satisfaction with the values of the objective functions by means of fuzzy membership functions.