Hungarian PM Magyar says Danube water levels are expected to remain too low for weeks to restart the Paks nuclear power plant

Low-river constraints on thermal generation are a recurring feature of European energy markets, most visibly when drought conditions curtail cooling water for nuclear and coal plants and restrict barge freight on the same waterways. The distinction worth drawing is between a short outage, absorbed from reserves and imports, and a multi-week derating, which shifts regional power balances and lifts reliance on gas-fired generation at the margin, feeding through to prompt power and gas curves in the affected region. Paks supplies a large share of Hungarian electricity, so a prolonged loss of output tightens the domestic and Central European supply-demand balance and raises import demand from neighbours. In past low-water episodes, restart timing has hinged on sustained river level recovery rather than any single rain event, and operators have historically been conservative on re-synchronisation given cooling intake limits. Worth watching is whether hydrological forecasts shift the expected restart window, the utilisation of cross-border interconnectors, and any change in Hungarian gas burn for power. The signal is directional on Central European power and gas, not yet a firm supply number.