Teschen Silesia after the First World War is typically portrayed as a region of ethnic conflict and national rivalry. Focusing on gas, electricity, and water infrastructures of the divided city of Teschen, now Polish Cieszyn and Czech Český Těšín, this article shifts the focus from nationalist discourses of animosity and upheaval to stabilization and local cross-border cooperation. In examining the cities’ conjoined utility networks’ management as well as their partial reorientation towards domestic suppliers, it demonstrates that local interests and economic pragmatism often trumped national antagonism. Moreover, by allowing municipal politics to take central stage, the article shows that small town leaders on the periphery were not only obedient servants of their respective central governments. While the Polish and Czechoslovak nation-states attempted to curb transnational municipal dependency and thus erase all remnants of the Habsburg regime, small town leaders often acted as administrators first and nationalists second.