Protection Against Marine Fuel Price Risk
Fixed price, swaps, calls and collars compared on one assumed scenario, with worked figures for basis risk, over-hedging and cash flow.
There are three main ways to reduce exposure to ship fuel prices: a physical fixed-price agreement with a supplier, a financial swap kept separate from the fuel itself, and options that place a cap or a band on the price. A fixed-price deal writes down the price per tonne for a set port, grade and period. A swap leaves the fuel to be bought at market, with the difference between index and fixed price settled in cash. None of these removes the risk entirely, since port premium, quantity and counterparty exposure stay partly open. Every price below is an assumption, not a current market level, and this guide is not investment advice.
Identifying Who Carries the Risk
The first question is whose risk it is. On a time charter the charterer buys the fuel and carries the price risk. On a voyage charter or cargo contract it sits with the owner, unless a bunker clause passes it to the cargo side.
BIMCO's Bunker Price Adjustment Clause 2004 is one such clause. It sets a base price per tonne, the fuel grade, the port or index used for measurement and an agreed consumption per voyage. If the price on the first day of loading falls outside an upper or lower threshold, the excess is paid, with rises going to owners and falls to charterers.[1] Adding a swap on top of a contract with this kind of clause could open an offsetting position when the aim was to close one. The fuel share in freight is the natural starting point.
Common Assumptions
The worked examples share one scenario. An operator plans to buy 1,000 tonnes of VLSFO next month, at a port where the delivered price runs USD 15 above the monthly index average. That USD 15 is the port premium. Three index outcomes are tested: USD 440, 500 and 560. All numbers were chosen purely to show the mechanics.
Physical Fixed-Price Agreements
The buyer receives one price per tonne for a given port, grade and period, and the fuel is delivered at that price. If the supplier quotes an assumed USD 515, the buyer pays USD 515 whatever the index does. The supplier covers its own risk on paper markets and builds the cost into its quote, which is why not every seller can offer fixed prices.
Much besides price needs agreeing: port and delivery method, ISO 8217 edition and sulphur limit, monthly minimum and maximum volumes, what happens to untaken quantities, the list of ships and rights to switch ports. The volume commitment causes the most trouble. If a ship changes route or burns less, the buyer may struggle to lift what it promised.
Counterparty risk is prominent here, because the seller has to perform on the delivery date. The collapse of OW Bunker in 2014 showed how the position of sellers and suppliers along the chain can reach a buyer.[2] Buyers therefore look at the seller's finances and at who the physical supplier will be.
How a Swap Works
A swap is a purely financial contract, and only money changes hands. The buyer pays a fixed price and receives the index average at the end of the period. ICE's Marine Fuel 0.5% FOB Singapore swap, for instance, trades in units of 1,000 metric tonnes, settles against the average of Platts daily assessments in the period, pays 14 calendar days after settlement and lists up to 60 consecutive months.[3] Other references such as Rotterdam are also used.
In this example, the operator fixes 1,000 tonnes through a swap at USD 500.
| Monthly index average (USD) | Physical purchase (index + 15) | Swap result (per tonne) | Net cost (USD/t) |
|---|---|---|---|
| 560 | 575 | Receives 60 | 515 |
| 500 | 515 | Zero | 515 |
| 440 | 455 | Pays 60 | 515 |
| 560, premium rises to 40 | 600 | Receives 60 | 540 |
The last line shows what a swap leaves open. The index is fixed and the port premium is not, so a USD 25 rise in premium adds USD 25 to net cost. This is basis risk.
Basis Risk and Volume Risk
Basis risk is the gap between the hedge reference and the fuel actually bought, and it has four sources. Location: a Rotterdam index does not always track a purchase in the eastern Mediterranean. Product: VLSFO varies from blend to blend, and hedging with something that is not an exact match carries its own risk. Delivery: the index is an FOB cargo price, whereas a ship buys delivered fuel at a port. Timing: a swap settles on a monthly average, while the ship buys on one day. Mercatus makes a similar point about hedging with crude options, where the basis between crude and fuel oil stays open.[4]
Volume risk is a separate matter. Suppose the operator fixed 1,000 tonnes but a route change means the ship lifts only 700. If the index falls from USD 500 to 440, the swap costs USD 60,000, while the saving on physical fuel is 700 × 60 = USD 42,000. The net result is an USD 18,000 loss. The 300 tonnes over-hedged have become a price position, which is why firms usually fix only part of expected consumption. The ratio is a matter of company policy with no single right answer. The marine fuel management guide covers consumption planning.
Call Options as a Price Cap
A call option protects against rises above a chosen level while leaving the buyer free to benefit if prices fall.[5] The cost is an upfront premium, much like an insurance premium. Assume a USD 520 strike and a USD 15 premium per tonne. With the index at USD 560 the option pays USD 40, so net cost is 575 + 15 minus 40, or USD 550. With the index at USD 440 the option goes unused, and net cost is 455 + 15, or USD 470.
Collars as a Price Band
A collar combines a bought call with a sold put. When the premium from the put covers the premium on the call it is known as a costless collar. Cost then stays within a band: rises above the ceiling are covered by the call, and below the floor the buyer pays the difference.[6] The example uses a ceiling of USD 520 and a floor of USD 460. The table lines up the four approaches.
| Approach | Index 440 | Index 500 | Index 560 |
|---|---|---|---|
| Unhedged (index + 15) | 455 | 515 | 575 |
| Physical fixed price or swap | 515 | 515 | 515 |
| Call (520, USD 15 premium) | 470 | 530 | 550 |
| Costless collar (460 to 520) | 475 | 515 | 535 |
Figures are net cost in USD per tonne, and all are assumptions. Each approach has its price. The swap produces the narrowest outcome but gives up any benefit from a fall. The call keeps that benefit at the cost of a premium. The collar removes the premium and caps the gain once the index goes below the floor.
Margin and Cash Flow
Futures trade on an exchange in standard sizes, and the clearing house requires margin. An over-the-counter swap is a bilateral contract whose terms sit in the parties' own agreement, and ICE's product text likewise says that terms are confirmed directly between the parties.[3]
A correctly built hedge can still cause a cash squeeze. In this example, a USD 60 fall on 1,000 tonnes means USD 60,000 going out in settlement or margin, while the saving on cheaper physical fuel only arrives with later stems. A liquidity plan belongs in the hedging decision.
Assessing the Approach
The test of a hedge is whether cost stays close to budget, and beating the market after the fact is the wrong yardstick, since with hindsight one of the alternatives will always look better. Firms generally weigh together whether the risk is really theirs, how much consumption they can forecast with confidence, their liquidity and their counterparties. For financial instruments, the product and legal structure should be settled with a bank or specialist. For physical supply, see the products and contact pages.
Frequently asked questions
What is a bunker fixed price agreement?
There are three main ways to reduce exposure to ship fuel prices: a physical fixed-price agreement with a supplier, a financial swap kept separate from the fuel itself, and options that place a cap or a band on the price.
What is the difference between a fixed-price deal and a swap?
A fixed price covers physical delivery and is agreed with the seller. A swap stands apart from the fuel, the index difference is settled in cash, and the port premium stays open.
How far ahead can a price be fixed?
Physical deals usually run for a few months. ICE's product lists up to 60 months, although prices can be hard to find on distant tenors.
What happens if the price falls?
Under a fixed price or swap, the buyer misses the fall. A call lets the buyer benefit, less the premium, and a collar down to the floor.
Sources
- BIMCO. Bunker Price Adjustment Clause 2004.
- Norton Rose Fulbright. The Fallout from Res Cogitans and Expected Changes to Bunker Supply Contracts.
- ICE. Marine Fuel 0.5% FOB Singapore Swap, contract specification (MF4), 3 November 2026.
- Mercatus Energy Advisors. Does Hedging with Costless Collars Present Additional Basis Risk.
- Mercatus Energy Advisors. Hedging Bunker Fuel Price Risk with Call Options.
- Mercatus Energy Advisors. Bunker Fuel Hedging with Costless Collars.
