Two ships bunkering the same grade on the same day, in ports a few hundred miles apart, can pay materially different prices. Crude explains the general level. Almost everything interesting happens in the layers stacked on top of it.
Not One Market, But Many
The most common mistake in reading bunker prices is treating marine fuels as a single global commodity that tracks crude with a lag. Crude sets the foundation, certainly. But bunker fuel is not traded as one product in one place. It is sold as a physical delivery, to a particular ship, in a particular port, at a particular moment, and each of those specifics adds or subtracts real money.
Very low sulphur fuel oil illustrates the point. It exists because MARPOL Annex VI capped sulphur content at 0.50% by mass outside emission control areas, with a tighter 0.10% limit inside them. Refiners met that cap by blending, and the result is not a uniform product but a family of blends whose composition varies with the refinery, the feedstock, and the region. That is why compatibility problems arise when fuels from different sources meet in the same tank, and why a quoted global VLSFO figure tells an operator relatively little about what they will actually pay.
The Layers Above Crude
Working upward from the barrel, several distinct forces determine the number on a bunker quote, and they move somewhat independently of one another.
Refining and blending economics: What it costs to produce a compliant low sulphur blend, which shifts with refinery configuration and with demand for the competing products made from the same barrel.
Regional supply balance: Local availability at the specific port. A tight regional market can hold prices well above a neighbouring hub for weeks.
Hub versus outport: Major bunkering hubs with deep competition price differently from minor ports where a ship has few alternatives.
Delivery logistics: Barge availability, waiting time, and delivery mode, all of which are real costs embedded in the delivered price.
Regulatory cost layers: Emissions schemes that attach a cost per tonne burned in certain trades, entirely separate from the fuel’s own price.
The practical consequence for an operator is that the useful figure to track is the delivered price at the ports their own vessels actually use, and the differential between those ports. For a fleet with any routing flexibility, that differential is one of the few genuine levers available, and it is invisible to anyone watching a single global number.
The Spread That Matters More Than the Price
For owners weighing exhaust gas cleaning systems, the decisive figure is not the VLSFO price at all. It is the gap between VLSFO and high sulphur fuel oil. A scrubber-fitted vessel can burn cheaper high sulphur fuel while meeting the sulphur requirement through abatement, so the entire return on that installation is the spread, multiplied by consumption.
A scrubber does not save fuel. It buys access to a cheaper grade, which means its payback is set by a price gap no owner controls.
When the spread widens, scrubber-fitted tonnage gains a real operating advantage and payback accelerates. When it narrows, the capital cost, the maintenance burden, and the lost cargo space become harder to justify. The same logic reaches into chartering, since scrubber-fitted vessels attract different rates depending on where the spread sits. Anyone making or reviewing that investment should be watching the differential rather than the headline price of either grade.
What an Operator Can Actually Influence
Since the market level is beyond any single operator’s control, the practical question is which parts of the fuel bill respond to management. Several do, and they are frequently worth more than trying to time the market.
That final point is often decisive. Under a voyage charter the owner generally supplies and pays for fuel, taking the price risk directly. Under a time charter the charterer typically supplies it, shifting exposure to them while the owner’s risk runs through consumption warranties instead. A price move is therefore a different event depending on the contract, which is why bunker and performance clauses receive such scrutiny and why disputes over consumption surface when prices climb.
The Cost Beyond the Invoice
One structural change deserves attention from anyone modelling fuel costs over more than a year or two. The delivered bunker price is no longer the full cost of burning that fuel. Emissions regimes in some trading regions attach a compliance cost to combustion, and those regimes are designed to tighten on a published schedule.
The bunker quote tells you what the fuel costs. It increasingly fails to tell you what burning it costs, and that gap is widening deliberately.
For decisions with a long horizon, vessel investment, long-term charters, or fleet renewal, comparing fuels on delivered price alone now understates the picture. An alternative that looks uneconomic on the invoice may look different once the compliance layer is included, and different again against later years of the schedule. Modelling the two together, rather than treating regulation as a separate topic from fuel procurement, is becoming standard practice among operators who plan seriously.
Frequently Asked Questions
Why do bunker prices differ between nearby ports?
Because bunkers are a physical delivery rather than a single traded commodity. Local supply balance, competition between suppliers at that port, barge availability and waiting time, and delivery logistics all sit on top of the underlying crude and refining cost. Major hubs with deep competition typically price differently from minor ports where a vessel has fewer alternatives.
What is VLSFO and why does its quality vary?
Very low sulphur fuel oil is marine fuel blended to meet the MARPOL Annex VI sulphur limit of 0.50% by mass outside emission control areas, where a 0.10% limit applies. Because it is produced by blending rather than as a single standardised grade, its composition varies with refinery, feedstock, and region, which is why fuels from different sources are not always compatible in the same tank.
Why does the VLSFO to HSFO spread matter?
Because it sets the value of a scrubber. A vessel with an exhaust gas cleaning system can burn cheaper high sulphur fuel while still meeting the sulphur requirement, so the saving generated is exactly the spread between the two grades multiplied by consumption. A wide spread accelerates payback and strengthens the vessel commercially; a narrow one erodes both.
Can an operator do anything about fuel cost, or is it purely market driven?
Several levers are genuinely controllable: speed, since consumption rises steeply with it; hull and propeller condition, which affects resistance and burn; bunker port choice where routing allows; accurate quantity verification and quality sampling; and the charter terms that decide who carries the price exposure in the first place. These often matter more than attempting to time the market.
Sources: IMO MARPOL Annex VI, Regulation 14, Sulphur oxides and particulate matter · IMO MARPOL Annex VI, Regulation 18, Fuel oil availability and quality, including bunker delivery note and sampling requirements · ISO 8217, Petroleum products, Fuels (class F), Specifications of marine fuels · IMO Resolution MEPC.320(74), Guidelines for consistent implementation of the 0.50% sulphur limit
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