River-flow, generation and price data from April to July 2026 point to a drought corridor stretching from the Rhine delta to the lower Danube. Hydropower output across the corridor was about one-fifth below the recent norm, falling by a third to a half in the worst-hit systems. Nuclear plants along the Danube also cut output as river flows dropped to their lowest levels in seven years. Gas, imports and unusually wet conditions in Iberia helped offset the shortfall, but at steadily rising prices.

The Rhine and Danube have reached historic lows. Dwindling water levels are affecting shipping, agriculture and ecosystems — and raising concerns about the future of drinking…

Shrinking Po, Loire, Rhine and Danube expose scale of Europe’s deepening water crisis