Romania Fully Shuts Cernavodă NPP as Danube Flow Falls Below Cooling Threshold

River-cooled reactors have hit this wall before: in France’s August 2003 heatwave, EDF cut 3,700 MW when the Rhône and Garonne ran warm; Sweden’s Forsmark reactors were similarly curtailed in the 2018 European drought. Cernavodă, conceived in the 1970s and finally commissioned in 1996/2007 with open-loop Danube cooling, now reveals the structural risk such legacy designs face in a warming, more volatile hydrological cycle. The shutdown underscores two long-arc trends: (1) climate-driven water scarcity is beginning to constrain thermal power output across Europe, and (2) grid resilience is migrating from single large baseload units toward diversified, flexible sources and cross-border interconnection—Romania is already negotiating imports from Ukraine and Bulgaria. On a 100-year scale this moment may be a footnote, yet it hints that 20th-century infrastructure predicated on stable rivers may need redesign or replacement well before its engineered lifespan ends, shaping both Romania’s stalled Units 3-5 ambitions and the continent’s broader energy transition narrative.