Low German Coal Burn Softens Rhine Barge Crisis, For Now
Subdued coal-fired generation has cushioned the blow of record-low Rhine water levels, but persistent dry weather and surging freight costs threaten to tighten the equation.
Germany's coal-fired power plants are running well below normal this summer, and that quirk of generation economics is the main reason Rhine barge disruptions have not yet bitten harder. Montel reported on Wednesday (2026-08-12) that limited coal-fired output has so far contained the market impact of barging problems caused by record low river levels, even as freight costs climb.8
German solar and wind output in July ran roughly 40% higher than in the same period last year, according to Montel, cutting the call on thermal generation and, by extension, the coal volumes that would otherwise need to move by barge. Less demand for delivery means the capacity constraints on the river are hitting a smaller target.8
But the underlying logistics situation is deteriorating. Barge operators on the Rhine were cutting cargo loads by two-thirds as water depth in certain sections fell below half a metre, Montel reported in mid-July (2026-07-13). The Kaub chokepoint, the bottleneck between Rotterdam and Germany's industrial heartland, hit its lowest water level in decades for that point in the calendar year, according to Oilprice.com. Diesel freight costs from Rotterdam to southern Germany surged more than 50% in a single week as a result.5,7
The 2018 precedent is instructive. When the Rhine ran low in November 2018, Germany's industrial production fell 1.5%, dragging GDP down 0.4%, according to the Kiel Institute for the World Economy. This year's heatwave struck earlier and harder — the end-June episode alone cost the German economy more than 6 billion euros, an analysis by research firm Prognos for Handelsblatt showed during the week of July 13 (2026-07-13).7
The renewable cushion does not hold indefinitely. If dry weather continues and river levels stay depressed, the freight cost penalty grows even for the modest coal volumes moving now. Market participants told Montel that high transportation costs could become a genuine problem if the weather pattern does not break. Coal delivered by barge is already more expensive; any recovery in coal-fired dispatch — driven by lower wind output, higher power demand, or TTF softness — would land generators in a market where logistics costs have already repriced sharply upward.8
Germany's policy options on the coal side remain constrained. The economics and energy ministry told sources close to the matter, as Montel reported in the week of May 18 (2026-05-18), that restoring reserve coal plants to the market would be "problematic." The 6.7 GW of hard coal units held in reserve were described as relatively old with high generation costs, and extracting them from their back-up role would require significant lead time and investment. The ministry instead favoured a plan to build 12 GW of new gas capacity.1
That preference for gas over coal carries its own vulnerabilities. Germany pushed its Russian gas dependency from 55% before the Russia-Ukraine conflict to 35%, yet Uniper has reported receiving 60% less gas from Russia than contracted volumes. Berlin is targeting 90% utilisation of gas storage by December. ICE Endex TTF front-month traded at €58.67/MWh on August 12 (2026-08-12), keeping gas-fired generation expensive relative to historical norms and narrowing the headroom for a smooth substitution away from coal.2,1
France added pressure to the regional grid earlier in the season. During the week of July 13 (2026-07-13), the heatwave forced a 6.4 GW cut in French nuclear output — about 14% of the country's daily power demand — as river temperatures rose and limited cooling capacity at nuclear plants. That tightened cross-border availability and raised the premium on German domestic generation from any source.7
The seaborne coal market offers limited relief. Global coal shipments rose 14% year-on-year in June, driven by a 41% jump in Chinese imports as domestic supply weakened, according to Dry Cargo Magazine and Marine Link. Coal shipments to Japan, South Korea and the EU rose 27% year-on-year in April as LNG supply disruptions pushed buyers toward alternative fuels, BIMCO data showed. Newcastle physical coal traded at $122.10 per tonne on August 12 (2026-08-12), reflecting a seaborne market that has already tightened.6,4,3
Freight cost data from Rotterdam will be the earliest signal of whether the buffer is eroding. Any shift in wind generation toward seasonal averages, combined with sustained low water at Kaub, would compress what has kept this situation manageable so far.8,5