The City of Grenoble is actively engaged in the implementation of sustainable development policies and practices. Grenoble took advantage of the realization of an innovative district scaled project finished in 2008, for implementing a monitoring programme which aimed at assessing the effective energy efficiency achieved in an every-day life situation. The De Bonne District in the City of Grenoble was the first urban eco-district in France. In terms of energy efficiency, the project not only anticipated eight years of national thermal legislation for new buildings, but it also was pioneering in terms of evaluating and tracking energy performance in the long term. Until then, most of the existing European eco-districts did not have any specific assessments of energy performances.