Romania Calls for Power Rationing as SE Europe Loses 16% of Output in Heatwave
A 40C drought-driven heatwave has taken more than 4 GW offline across southeast Europe, pushing Romanian day-ahead power above €136/MWh.
Romanian Prime Minister Ilie Bolojan urged businesses and public institutions across southeast Europe to cut electricity use on Monday (2026-08-03), as a sustained 40C heatwave pushed regional power output down by more than 4 GW, roughly 16% of total capacity, leaving the region increasingly reliant on cross-border imports to keep the grid in balance, Montel reported.6
The outages are stacking, not isolated. Romanian day-ahead power was priced at €136.11 per megawatt-hour on Saturday (2026-08-08), reflecting domestic shortfalls and the cost of competing for imports from markets under their own strain.6
Nuclear generation has taken a disproportionate hit. Nearly one-third of southeast Europe's nuclear capacity (around 2 GW) was offline as of Thursday (2026-07-30) after record-low water levels in the Danube basin restricted cooling water supplies and forced reactor shutdowns in Romania and Hungary, Montel reported. River temperatures rise with air temperatures, and restarts require conditions that are not arriving.5
France ran into the same constraints further west. During the week of July 13 (2026-07-13), French nuclear output was cut by 6.4 GW, roughly 14% of the country's total power demand for the day, as heatwave conditions raised river temperatures and limited each plant's capacity to discharge waste heat within regulatory limits, Oilprice.com reported. That single-country curtailment would exceed the entire nuclear capacity offline across southeast Europe.4
The heat is also disrupting fuel distribution. Water levels at the Kaub chokepoint on the Rhine were at their lowest level in decades for mid-July as of the week of July 13 (2026-07-13), pushing freight costs for diesel shipments from Rotterdam to southern Germany up by more than 50% in a single week, according to Oilprice.com. When the Rhine runs shallow, landlocked supply nodes in southern Germany face higher transport costs or reduced inventory. In November 2018, a similar Rhine low-water event contributed to a 1.5% fall in German industrial production and a 0.4% contraction in GDP, according to the Kiel Institute for the World Economy.4
The economic bill is already substantial. An exclusive analysis by economic research firm Prognos for Handelsblatt estimated the end-June (2026) heatwave cost the German economy more than €6 billion, or around $6.8 billion. Prognos also projected that each future day on which temperatures exceed 35 degrees Celsius costs Germany approximately €1 billion.4
Middle East tensions are adding pressure on crude. ICE Brent front-month held at $82.38 per barrel as of Sunday (2026-08-09). Markets absorbed a sharp jolt on June 10 (2026-06-10), when Brent surged 3% after fresh US strikes on Iran rattled crude, according to Invezz. Montel's analysis has traced how the Iran conflict is feeding volatility into gas-fired European generation and stressing interconnector flows across the continent.2,1
LNG supply is tightening from the same source. Roughly 20% of daily LNG supply from the Middle East has been lost, Investing.com reported, arriving alongside stronger Asian cooling demand at a time when Europe needs to sustain storage injection for winter. ICE Endex TTF front-month stood at €55.50 per megawatt-hour on Saturday (2026-08-08). Gas-fired generation fills the gap when nuclear and hydro output falls. Southeast Europe is short of both right now, and its gas import capacity is finite.3
Danube water levels are what European power operators will be tracking when markets reopen. If they stay suppressed through August, the 2 GW nuclear shortfall in Romania and Hungary becomes an unplanned gas demand increment during the final weeks of the pre-winter storage window, precisely when Europe can least afford to burn gas it planned to store.