Northwest Europe's ARA hub lifted independently held fuel oil inventories by 15% in September versus August — a 47% recovery from May's decade-low — yet prompt bunker supply tightened across Mediterranean and African ports, with South African buyers facing 10–15 day lead times to secure deliveries.

What does the ARA storage rebound look like?

The Amsterdam-Rotterdam-Antwerp region built September stocks even as fuel oil imports ran at roughly 276,000 b/d, down from August's 342,000 b/d pace, per Vortexa cargo flows data. Mexico supplied 23% of those cargoes, Colombia 19% and Benin 14%.

Inventories, however, remain 18% below February levels — before the Middle East conflict reshaped trade flows — underscoring an incomplete rebuild ahead of winter.

Independent gasoil inventories, covering diesel and heating oil, climbed a more modest 2% month-on-month. ARA gasoil imports slipped to 141,000 b/d from 155,000 b/d in August, with the US (30%), the UK (18%) and Sweden (12%) the largest source countries.

Traders continue to advise lead times of 5–7 days for prompt fuel oil coverage in the ARA, where loading issues persist at some suppliers. Hamburg requires five days' notice across grades.

How tight is the Mediterranean?

Gibraltar Strait buyers face the longest waits in the region: 7–10 days for prompt fuel at competitive prices, according to an ARA-based trader. Port agent MH Bland put the operational delays bluntly: "Two suppliers in Gibraltar are running around 4-6 hours behind schedule, while one supplier is running around 8-12 hours behind schedule."

Knock-on delays ripple across the basin:

• Algeciras (Spain): one supplier more than a day late on HSFO; 6–12 hour delays for other products
• Ceuta: barge deliveries slipping 8–10 hours; ex-pipe flows on schedule
• Barcelona: one week of notice required for any grade
• Las Palmas (Canary Islands): 7–8 day lead times; a trader flagged strong demand from vessels rerouting around Africa due to the Middle East conflict
• Piraeus (Greece): 5–7 day lead times, pressured by summer cruise demand and barge availability

Lisbon (3–5 days), Malta (3–4 days) and Istanbul (1–4 days) remain the Mediterranean's most accessible bunkering hubs.

Where is African supply most stretched?

Conditions tighten progressively south of the Sahara.

In Angola's Luanda, one supplier has run out of VLSFO and LSMGO and expects replenishment within one to two weeks. Nigeria's Lagos anchorage — where demand runs primarily from oil tankers — needs 7–9 days of lead time for VLSFO amid local refinery maintenance that a supplier expects to resolve before the end of October.

South Africa presents the survey's tightest picture. A trader described Durban availability as extremely tight, with Cape Town constrained until 4 October. Even the comparatively better-supplied Richards Bay and Algoa Bay require 10–15 days of advance booking.

Mauritius' Port Louis needs 10–14 days; Togo's Lome sits at around one week for LSMGO and VLSFO. Namibia's Walvis Bay demand is stable but prompt supply is tight, at 5–7 days.

Mozambique splits along its coast: VLSFO and LSMGO are normal in northern Nacala, while southern Maputo reports very tight VLSFO availability, per a trader.

What should operators watch into Q4?

B100 biodiesel bunker samples recorded in Rotterdam between January and August rose sharply versus the same eight-month window a year earlier, per ENGINE's fuel quality data — evidence that bio-bunkering demand is gaining traction as shippers pursue lower-emission fuels amid tight conventional supply.

With ARA stocks still 18% below pre-conflict February levels, Africa-rerouting vessels continuing to call at Atlantic hubs, and unscheduled refinery downtime persisting in West Africa, shippers should plan bunker calls around 7–10 day lead times across the Mediterranean and Africa through October, with tighter expectations if winter heating demand draws ARA gasoil inventories down further.