The recent laws of Energy Transition For Green Growth (TEPCV) and New Territorial Organisation of the Republic (NOTRe) now place the communities at the heart of the system to manage the mix-energy at best so that it is as close as possible to the needs and capacities of local resources. For several years, the Commune of Cattenom has taken full account of the challenges posed by this change by engaging in a proactive policy on sustainable development. The establishment of the heat network will reduce CO2 emissions and combat rising energy costs.