European ultra-low sulphur diesel markets faced a sharp supply squeeze in September 2026, with refinery maintenance, unexpected outages and Rhine transport restrictions pushing prices and refining margins higher, according to Alkagesta Market Insights. Its review describes tight conditions across Northwest Europe and the Mediterranean, despite refiners running primary distillation units close to their technical limits.
Alkagesta reported that CIF Northwest European diesel cracks against Dated Brent reached $86.15 a barrel on 8 September, while front-month ICE low sulphur gasoil futures peaked at $1,568 a tonne on 15 September. The strong margins encouraged additional deliveries from the Americas and Asia. Between 549,000 and 781,000 tonnes of Indian diesel and gasoil loaded during September were destined for Europe, according to the review, alongside increased westbound allocations from Chinese refiners.
Those imports faced competing pressures. Alkagesta said US commercial distillate stocks were approaching 20-year lows, raising questions about the durability of high American export volumes. European buyers also competed with Asian importers for supplies from refiners east of Suez. In Southern Europe, the switch to French winter-grade diesel coincided with local hydrocracker maintenance, lifting bids at Mediterranean ports to premiums of $25–$75 a tonne over ICE low sulphur gasoil.
Inland distribution was another constraint. The review put water depths at the Rhine’s Kaub chokepoint at 15–20 cm by 21 September and Amsterdam-Rotterdam-Antwerp-to-Basel barge freight above €215 a tonne. It said barge movements to Upper Rhine destinations in Germany and Switzerland had stopped, increasing pressure on rail and pipelines. Switzerland released 30,000 cubic metres of strategic diesel stocks, according to Alkagesta.
The firm expects limited stock cover, secondary processing maintenance and transport bottlenecks to underpin diesel valuations into the fourth quarter. It placed ARA middle distillate inventories at 2.108 million tonnes, 25% below their five-year average. A planned hydrocracker outage at Portugal’s Sines refinery would constrain diesel production, while delayed heating oil purchases in Germany and Switzerland could concentrate buying as temperatures fall. Alkagesta also expects Rhine restrictions to continue until sustained rainfall arrives. The publication, available at https://alkagesta.com/european-ulsd-market-outlook-september-2026/, bases its assessment on internal analysis and external information and cautions that actual outcomes may differ from its projections.