The closing of the aging nuclear power plant of Fessenheim was eventually concretized in June 2020 after many years of controversy, reflecting the sensibility of closing nuclear power plants in France, the world's second largest producer of nuclear power. This paper provides insight into how this highly policy vexed issue was discussed on the local level during 2017, a period when the decision regarding the shutdown was still at stake. Here, I examine the discursive strategies mobilized by key actors lobbying for the shutdown or maintenance of the nuclear power plant to enhance their argumentations. Using political discourse analyses combined with the logics approach, the article shows that the argumentation of proponents and advocates of a shutdown is structured around the same concept of sustainability. However, economic growth, social prosperity, and environmental “cautiousness” are not articulated with the same chain of equivalence and do not activate the same fantasmatic logics.