Global Fuel Oil Markets Face Severe Disruption From Maritime Choke Points and Rhine Bottlenecks

Global energy markets are confronting severe operational constraints as geopolitical friction and inland logistical failures disrupt fuel oil movement. Transits through the Strait of Hormuz dropped to 13 vessels on August 9 after a strike on an ADNOC-linked tanker, while Bab al-Mandab vessel counts fell to a 2026 low of 16 ships earlier the same week. Diplomatic efforts between the United States and Iran have reached an impasse as both parties demand war damages, leaving key transit corridors exposed to ongoing operational uncertainty.

In Europe, inland water transport faces acute pressure as water levels at the Kaub gauge on the Rhine dropped to 16 cm on August 10, with projections pointing toward 4 cm by August 14. Barge operators have been forced to trim loading capacity to 15–20%, carrying roughly 250 mt per voyage. As a result, heavy fuel oil remains trapped at coastal refining hubs, causing inventories in the Amsterdam-Rotterdam-Antwerp (ARA) region to jump 24.69% week-over-week to 707,000 mt for the period ending August 6.

Crude volatility and physical tightness have fed directly into benchmark pricing. Front-month ICE October Brent futures fluctuated sharply, dropping over 5% to $79.36/b on August 4 before recovering to $83.55/b on August 7 amid stalled negotiations. Physical markets reflected heightened supply anxiety, with the Platts cash Dubai differential reaching a $7.49/b premium over same-month futures on August 4 following a projectile strike near Khasab, Oman. In Singapore, FOB 380 CST HSFO reached $554.26/mt and 0.5% Marine Fuel rose to $743.76/mt by August 7, while the Singapore Hi-5 spread widened to a multi-year peak of $225.93/mt on August 3.

Regional Supply and Demand Dynamics

Data compiled by Alkagesta shows a substantial shift in Asian supply lines, as Middle Eastern fuel oil deliveries into Singapore nearly tripled week-over-week to 328,878 mt by July 29, led by arrivals from Saudi Arabia, Iraq, and the United Arab Emirates. Commercial heavy distillate inventories in Singapore rose 8% to 19.58 million barrels by August 5, despite weekly fuel oil exports plunging 57.4% to a one-year low of 150,139 mt. Meanwhile, July bunker sales in Singapore dropped 3.7% month-over-month to 4.44 million mt as elevated spot premiums caused buyers to shift prompt marine fuel demand toward alternative regional hubs such as Zhoushan and Port Klang.

European high-sulfur fuel oil supply has received support from Western Hemisphere arbitrage, with 394,441 mt scheduled to arrive in Northwest Europe during August from Mexico, Colombia, and Venezuela. Conversely, low-sulfur cutter stocks remain tight due to high refinery margins for middle distillates and a sourer regional crude diet. Highlighting the broader impact on maritime operations, Mithat Çiftçioğlu, Marine Fuels Distribution Director at Alkagesta Singapore, stated that as long as Hormuz remains closed, fuel access rather than oil prices represents the primary risk for international shipping, a theme detailed further in the Alkagesta fuel oil market outlook.

In the Middle East, Fujairah heavy distillate stocks expanded 8.6% to 3.787 million barrels by August 3, registering their first gain in four weeks as local refineries increased output during a brief abatement in regional tensions. However, structural deficits are anticipated to persist globally. Sustained diesel crack strength and constrained low-sulfur components are expected to maintain the Singapore Hi-5 spread above $200/mt through the third quarter, while severe Rhine inland transport constraints threaten to widen price spreads between coastal European hubs and inland consumer markets.