Record-Low Danube Forces First-Ever Shutdown of Hungary’s Paks Nuclear Plant

River-cooled reactors have stumbled before—France throttled nuclear output during the August 2003 heatwave and the US Browns Ferry plant curtailed power in the 2012 drought—but this is the first complete shutdown of a European plant solely for lack of cooling water. The episode crystallises two converging trends: Central Europe’s deepening dependence on a single, climate-vulnerable river system and the growing climatic volatility that models have projected since the IPCC’s 1990 First Assessment. Budapest’s 1980s-era Soviet design assumed a stable hydrology; four decades later that assumption is breaking down just as post-Ukraine-war politics pushed Hungary to double down on domestic generation. Whether Hungary now accelerates grid interconnection, storage and renewables—or clings to river-dependent baseload—will echo for decades. On a 100-year horizon, the event is a data point in the long shift from thermal plants sited on rivers to more water-frugal or decentralized systems, akin to how the 1880s transition from steam to electric trams rewired urban energy infrastructure across Europe.