Bunkering at Gibraltar: How It Actually Works

25 August 2026 Last checked 2026-08-25

5,267 fuel calls in 2025 and 2026 running ahead of it. Where stems are delivered, what grades and notice periods apply, and when Algeciras is the better call.

A ship stops at Gibraltar for one reason. It is the last or first cheap fuel before the Atlantic, sitting on the only door into the Mediterranean, and it can be done at anchor without paying for a berth.

That is the entire commercial proposition, and it has held for three hundred years. Here is how the operation actually works in 2026, what it costs you in time, and when Gibraltar is the wrong answer.

The numbers first

The Gibraltar Port Authority recorded 5,267 ship calls for fuel in 2025, alongside 220 cruise calls, in the published port statistics.

2026 has run well ahead. The first half closed at 2,869 bunker calls against 2,548 for the same period last year, up around 12.6 per cent. May alone took 599 calls, the busiest single month recorded since at least 2011, and June came in 17 per cent up year on year.

The catchment explains it. Something over 60,000 vessels transit the Strait every year and Gibraltar sits directly on the lane, capturing a share of that traffic that no inland port can reach.

Where it happens

Most bunkering here is done at anchor, not alongside. The western anchorage holds roughly fourteen sheltered positions and is where the great majority of stems are delivered, by barge, to a vessel that never ties up.

Delivery alongside is possible for a vessel already in port, and off port limits operations cover work outside the port limits themselves. Around eight bunker barges operate in Gibraltar waters, which is what allows the port to turn over that call volume without a queue building.

Not paying for a berth is a real saving and it is the reason the anchorage model persists. It also means your delivery is exposed to weather in a way an alongside stem is not.

Grades and who supplies them

The supply picture is narrower than the call volume suggests. Three physical suppliers offer LSMGO. Two offer VLSFO and HSFO.

MH Bland, which has been in this trade in Gibraltar since the nineteenth century, is one of the established names, and the concentration of supply is worth understanding before you assume competitive tension on every stem.

How much notice to give

This is the part that decides whether Gibraltar saves you time or costs it.

VLSFO: 24 to 48 hours is usually enough. MGO: 48 to 72 hours, because demand is higher against fewer suppliers. Summer, June to September: 72 hours or more if you want a guaranteed slot, because cruise activity stretches the delivery windows.

Booking a stem on twelve hours notice in August is how a nine hour call becomes a twenty hour one. The port is efficient. The supply chain into it is not infinitely elastic.

What a call actually costs you in time

A well planned stem is fast. In one documented case a vessel on the Asia to Europe route took 2,500 tonnes during a nine hour anchorage call, which is the kind of turnaround the port is built for.

Nine hours at anchor is also long enough to do everything else that needs doing. Spares, provisions, a technician, a crew change. Agents here treat the bunker call as the anchor point and hang every other task off it, which is why the same nine hours can carry three separate operations.

Plan the stacking deliberately. A crew change scheduled to start after the stem finishes wastes the window, because the launch can run people ashore while the barge is still pumping. The vessels that turn round fastest here are the ones whose agent had every task queued before arrival rather than sequenced on the day.

The other variable is the barge itself. A stem split across two barges, or a barge released late from a previous vessel, is the commonest reason a clean plan slips, and it is largely outside your control once you are at anchor. Build the slack in before you arrive rather than trying to recover it afterwards.

The fuel is why the ship stops. Everything else that gets done is why the stop is worth planning properly.

Weather, and the one wind that matters

The levanter is the easterly that forms a banner of cloud over the Rock and it is not a curiosity when you are trying to deliver fuel.

A strong winter levanter can disrupt operations at the eastern anchorage. The western anchorage is sheltered and usable in most conditions, which is a large part of why it carries the bulk of the work. If your stem is planned for the eastern side in winter, build in slack.

Gibraltar, Algeciras or Ceuta

Three ports share this stretch of water and the honest answer is that they are not interchangeable.

Algeciras is the bigger port by some distance, handles comparable bunker volumes, has far more extensive repair facilities and connects to the Spanish rail network. For container work and heavy engineering it is usually the right call.

Ceuta can be cheaper, with less congested anchorages and a position that suits some North African routings.

Gibraltar competes on a more established bunker market, greater supplier choice historically, sheltered anchorage, and an operational record that charterers trust. It also runs in English under English derived law, which removes friction from documentation and from any dispute.

The academic work on this stretch found what operators will tell you anyway: price and geography dominate the decision, with port tariffs, waiting time, customs strictness and the ease of doing a crew change deciding the close calls.

That last factor is worth weighing properly. If your call involves people as well as fuel, Gibraltar's compression is hard to beat, and our crew accommodation guide for agents covers what that involves.

What the agent is actually for

Operators new to the port sometimes treat the agent as a formality. They are not. On an anchorage call the agent is the only party physically able to make things happen while your vessel sits a mile offshore.

They lodge the arrival paperwork, book the barge slot against the supplier, arrange the launch, clear anything coming aboard through customs, handle immigration for anyone joining or leaving, and chase the delivery when the barge is late. On a nine hour window with three operations stacked on it, the agent is the critical path.

The corollary is that a cheap agent is rarely a saving. The cost of a poor one is measured in hours at anchor, and hours at anchor cost far more than the difference in agency fee.

Quantity and quality, and the two disputes that actually happen

Two things go wrong on bunker stems worldwide and Gibraltar is no exception.

Quantity. The gap between what the barge says it delivered and what the vessel says it received is the oldest argument in the trade. Attend the measurement, take your own soundings, and do not sign a bunker delivery note you disagree with without noting the protest on it. A signature without a remark is very hard to walk back afterwards.

Quality. Take representative samples at the manifold, properly sealed and jointly witnessed, and keep the retained sample. Off specification fuel that is only discovered when it reaches the engine is a claim you will lose without a sample everyone agrees was taken correctly.

None of that is specific to this port. It is specific to buying fuel at sea from a barge, and the discipline is the same in Rotterdam or Singapore.

Scrubbers, and what the fuel mix looks like now

The 2020 sulphur cap reshaped this market and the shape has settled. VLSFO is the default. LSMGO covers emission control areas and manoeuvring. HSFO is still supplied here, and it is bought by vessels carrying exhaust gas cleaning systems that let them burn it compliantly.

That three grade split is what the supplier base is built around, and it is worth confirming grade availability rather than assuming, because the number of physical suppliers behind each grade is small.

Alternative fuels are the open question. Methanol and LNG bunkering are developing across the Mediterranean and any operator planning a dual fuel newbuild should be asking the port directly about capability rather than relying on a guide, including this one.

Why here, and not somewhere more sensible

Gibraltar has no oil, no refinery and no hinterland. Every tonne it sells arrives by sea and leaves by sea. On paper that is an absurd place to run a fuel business.

It works because of position. The Strait is the only entrance to the Mediterranean, so a vessel going in or out passes this point anyway, and a stop that costs no deviation is close to free in voyage terms. Ships have taken on supplies here since 1704 for exactly that reason. The commodity has changed from water and salt beef to very low sulphur fuel oil. The geography has not moved.

That is also why the port keeps growing while its physical constraints stay fixed. There is no more land. There is just a very good address, and the Port Authority selling access to it.

When Gibraltar is the wrong answer

If you need dry dock capacity beyond routine work, if you are moving containers, or if your routing genuinely favours the African side, another port is the better answer. A guide written by an operator in Gibraltar should still say so.

Gibraltar is a fuel and services stop on a transit. It is excellent at that and it does not pretend to be a general cargo hub.

If your call involves people

A bunker call that also carries a crew change turns an operational question into a human one, and the crew still have to be somewhere.

Victory Suites is on Devils Tower Road, close to the port and three minutes from the airport, with 100+ apartments and a full kitchen in every one. We hold rooms on account for agents, invoice monthly rather than per booking, take same day and out of hours requests, and release without penalty when a vessel sails early. Studios start at 120 GBP per night with weekly and monthly rates for longer holds.

For what the crew themselves should know once they are ashore, see our shore leave guide.