Between the second half of the 2000s and the first half of the 2010s, the prospect of shale gas extraction in Europe at first prompted fervent political support, then met with local and national opposition, and was finally rendered moot by a global collapse in the oil price. In the Europe-wide protests against shale gas and the main technique employed to extract it, hydraulic fracturing (or fracking), counter-expertise played a crucial role. This kind of expertise is one of the main elements of “energy citizenship,” a concept recently developed in the field of energy humanities which describes the empowerment of citizens in decision-making processes related to energy issues. This paper provides a socio-historical analysis of the co-production of counter-expertise and energy citizenship in the two European countries endowed with the largest shale gas reserves: Poland and France. In my analysis, concerns over the disruption of the food-water-energy nexus due to possible pollution emerge as particularly important. I argue that the exchange of information between activist groups and NGOs, as well as between activist groups from distant European locations, allowed for the creation of a genuinely transnational and science-based anti-fracking movement.