Nuclearelectrica, Hungary, has begun to to disconnect the final nuclear reactor, due to the continued low Danube level

River-driven nuclear curtailments are a recurring feature of Central and Eastern European power markets: low water levels restrict cooling capacity, and the affected plants have historically reduced output progressively rather than tripping outright, with full disconnection marking the tail of that sequence. The distinction that matters is duration: episodes tied to seasonal low-flow periods have tended to persist for weeks and resolve with rainfall, whereas those driven by prolonged drought have stretched longer and pulled replacement generation from gas and coal, tightening regional power and gas balances simultaneously. The transmission runs through spot and front-month power prices in the affected bidding zones and through cross-border flows, as neighbouring systems absorb the shortfall; gas demand for power burn is the secondary channel. Prior form in comparable episodes is that operators reconnect quickly once river conditions normalise, so the market premium has typically concentrated in the prompt rather than the curve. Worth watching are Danube flow readings, any parallel cooling constraints at other riverside thermal plants in the region, and whether the outage window overlaps with scheduled maintenance elsewhere in the regional fleet.