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This study proposes a methodology for evaluating energy technologies according to their environmental impact, both for the present and future. The methodology emphasizes the use of quantitative data relating to six key parameters: the quality, quantity and renewability of the available energy used and the maintainability, efficiency and sustainability of the end-use technologies. These parameters are incorporated into an original objective function that obtains a value for each of the energy–technology–environment interactions. This methodology was applied to three separate scenarios relating to Mexico's future energy use in order to evaluate the environmental impact of ten end-use technologies. This approach is applicable to any nation or region interested in making informed choices about its energy future.