A German river gauge emptied Swiss fuel barges, and Switzerland opened its jet-fuel stocks

Why these three series belong together

The three series meet in one question: how much fuel a tanker can carry past Kaub, the Middle Rhine's shallowest point. The gauge sets the load and the load sets what lands in Basel. It is the Mississippi mechanism in another geography: refined fuel instead of grain, a landlocked buyer with statutory stocks and other routes, and a crude-price shock to strip out, which the Germany-minus-Belgium price gap does.

What the river did

On 1 July the Kaub daily minimum read 85 cm [F1]. The daily mean fell below the 77 cm low-water reference on 10 July at 70.57 cm [F6], and the minimum reached 44 cm on 16 July [F4]. By 24 September the daily mean was 5.45 cm [F7]; on 1 October the minimum touched −6 cm [F2] and the mean −4.75 cm [F8], the period's lows. On 15 October the minimum read 9 cm [F5]; by 23 October it had recovered to 20 cm [F3], with a daily mean of 25.59 cm [F9]. From July the daily mean averaged 35.0 cm [F37].

The federal hydrology institute's forecasts of 22 and 23 October show a brief rise near 91 cm around 28 October, a 95 percent probability of being back below 77 cm on 5 November, and median weekly means of about 45 to 65 cm in November.

What arrived in Basel

Mineral oil landed at the Swiss Rhine ports fell from 125,541 t in June [F10] to 93,982 t in July [F11], 38,791 t in August [F12] and 33,584 t in September [F13], 82.0 percent below the February peak of 186,889 t [F16, F14]. All inbound cargo fell too, from 300,128 t [F17] to 113,832 t [F18]. The Rhine carried about 22 percent of Swiss mineral-oil imports in 2025 and every third litre of heating oil; rail about 31 percent; pipelines from southern France about 41 percent, mostly crude for the Cressier refinery. The SAPPRO products line serves Geneva, not the Basel tank farms.

What the German consumer paid, and why the national spread does not show the river

German heating oil rose from 1,135.2 EUR per 1000 L on 29 June [F19] to 1,712.8 on 19 October [F20]; Belgian from 1,003.2 [F23] to 1,545.0 [F24]. The Germany-minus-Belgium spread moved from 132.0 [F28] to 167.8 [F31], below its January level of 206.0 [F27] and inside its own swings, from −82.0 on 3 August [F34] to 171.4 on 21 September [F30]; its 2026 average is 86.7 [F38]. Week by week it shows no link with the gauge.

The premium sits where Rhine barges deliver: on 24 October heating oil cost 178.52 EUR per 100 L in Hessen, 177.30 in Rheinland-Pfalz and 177.22 in Nordrhein-Westfalen, against 170.78 in Niedersachsen, 172.55 in Baden-Württemberg and 172.86 in Bayern. Swiss prices rose about 35 percent from June to September, less than German and Belgian ones.

The mechanism, and what else could explain it

Hypothesis · At −6 cm the channel held about 107 cm of water; after a carrier's 20 cm keel clearance that leaves 87 cm of draft, less than a large vessel draws empty, and a 30 cm margin leaves less. Spot freight from the ARA hub to Karlsruhe went from about 45 EUR per tonne in late June to about 200 in October. Demand destruction after Hormuz fits Basel poorly, since all cargo fell; the crude shock explains most of the German price rise. Whether rail congestion and rain-delayed French pipelines alone would have forced the stock releases is open.

Who sits on this chain

Port of Switzerland lost most of its fuel intake. The federal supply office released up to 30,000 cubic metres of jet fuel on 15 October after rail deliveries to Zurich airport failed, then 45,000 of diesel. SBB Cargo and DB Cargo took diverted volume; VT Group and Interstream Barging earn spot rates on fewer tonnes. MiRO at Karlsruhe, above the bottleneck, has two faces: its barges still serve Basel, while its gate cut truck prices to clear product it could not ship to ARA. SPSE's crude line to Cressier competes with the river.

Hypothesis · Deduced: Vitol Aviation Switzerland, a jet-fuel trader, may gain; Rotterdam and Antwerp-Bruges load fewer, lighter upstream barges.

A conditional sensitivity, not a forecast

Scenario · The 30,000 cubic metres of jet fuel equal about 4.7 days of Swiss taxed consumption in the first half of 2026, and the 6.5 percent share implies a stock of about 461,500 cubic metres. If the gauge stays low and the federal delegate releases the further 13.5 points he may grant alone, about 62,300 cubic metres, that bridges about 9.8 more days and leaves roughly 58 days in stock.

What would change this reading

Hypothesis · A Kaub reading at or above 100 cm on 30 November should lift Basel intake toward its July level by December; intake that stays low on an open river would point to demand, not draft. A daily regional price series, or Basel landed prices for Karlsruhe against ARA product, would locate the freight premium. A national spread outside its observed range would reopen the price question.