Key takeaways
- State whether the vessel is already calling or evaluating an additional stop.
- Compare the same accepted fuel requirement across feasible alternatives.
- Separate fuel savings from the time and services created by the call.
- Use the actual required quantity rather than increasing it to fit a threshold.
Define the Gibraltar delivery proposition
Gibraltar Port Authority describes barge delivery at anchor in Gibraltar Bay and delivery alongside. GPA bunkering information
The enquiry should identify the proposed mode and period for assessment, without assuming that either is available for the particular vessel. The relevant parties must confirm the usable proposition before the buyer counts its economic benefit.
For a current transaction, the additional-call comparison is not provided; obtain current verified information. Record the accepted fuel quantity, delivered quotation, authorised call assumptions and included incremental costs, with uncertainties stated.
Establish the alternative the vessel would otherwise use
A saving requires a real comparison. Identify the feasible alternative purchase, including its grade, quantity, timing and delivered scope. An unavailable price from another location is not a useful baseline for the immediate decision.
Keep the required quantity consistent unless the responsible team identifies a different accepted requirement for each alternative. If the quantity changes, explain why rather than presenting the entire difference in total cost as a price saving.
A vessel already visiting Gibraltar for another purpose has a different cost boundary from one considering an additional stop. The fuel decision should include the costs it creates, while preserving common expenses consistently in both alternatives.
Ask for the full call consequence
Obtain the relevant commercial estimate for the proposed stop, including additional time and necessary services. Do not invent a standard call duration or apply a generic port-cost allowance without its scope.
Identify which expenses are fixed, quantity-dependent or conditional. If the supplier's delivered fuel price includes a service, avoid adding that same component again through the agent's estimate.
The timing assessment belongs to the responsible vessel and port-side parties. The commercial desk uses their supported inputs; it does not prescribe the route, anchorage or navigation sequence.
A fictional break-even quantity
All amounts below are invented. The example assumes identical accepted fuel and an assessed feasible call, with no unlisted consequences.
ILLUSTRATIVE: A proposed purchase of 800 tonnes saves $20 per tonne compared with an available alternative, producing $16,000 of fuel savings.
The additional call has $10,000 of defined service costs and 6 hours of incremental time valued at $1,500 per hour, adding $9,000. Total incremental call cost is $19,000, so the simplified net effect is negative $3,000.
At an unchanged $20-per-tonne saving and unchanged $19,000 call cost, the arithmetic crossover is 950 tonnes. If the vessel is already calling and only $3,000 of incremental cost is attributable to the fuel choice, the same 800-tonne purchase produces a positive $13,000 difference.
The crossover does not recommend buying additional fuel. It helps explain why the same unit-price advantage can lead to different decisions under different call boundaries.
An extra-call enquiry matrix
| Comparison item | Evidence to obtain | Error prevented |
|---|---|---|
| Alternative purchase | Current feasible grade, quantity and delivered offer | Comparing with an unavailable baseline |
| Gibraltar fuel | Scoped supplier quote and acceptance | Counting a conditional price as executable |
| Call purpose | Existing visit or additional fuel stop | Charging common costs inconsistently |
| Additional time | Responsible assessed sequence | Assuming the stop has no timing consequence |
| Services | Scoped charges and inclusions | Omitting or duplicating delivery-related expense |
| Remaining conditions | Required confirmations and deadlines | Treating arithmetic as call approval |
The table ties the enquiry to a decision rather than collecting an isolated price that cannot be evaluated.
Fictional case: the call was already in the programme
A fictional operator first rejects a Gibraltar quotation because it adds the full cost of a dedicated stop to the fuel purchase. The vessel's authorised programme, however, already includes a separate service call there.
The desk reassesses which costs the fuel choice actually creates and obtains confirmation that the proposed supply can fit the existing visit. It then compares the remaining incremental consequence with the available alternative fuel purchase.
The outcome changes because the boundary changes, not because the fuel supplier revised its price. The buyer preserves the common call expenses elsewhere rather than pretending they do not exist.
Keep the recommendation conditional on the assessed plan
If the proposed delivery window would extend an existing call, include that additional effect. An already planned visit does not make every bunker arrangement costless.
Likewise, if the alternative purchase ceases to be available, refresh the comparison before relying on its old price. The useful decision concerns current feasible choices at the relevant deadline.
Check the current text and obtain appropriate review where cancellation or changed-call terms affect the comparison. A positive model does not create a right to a delivery opportunity or establish vessel suitability.
Common mistakes
Do not report gross fuel savings as the net value of an additional stop. Other errors include adding all existing-call costs to one alternative, omitting an extended stay and increasing quantity solely to cross a model threshold. An attractive comparison still needs an accepted, available delivery proposition.
Where Zeaclub fits
Zeaclub provides a multi-party shared workspace for owners, charterers, brokers and port agents.
Zeaclub offers digitalised procedures across the voyage workflow.
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Educational information only; not legal, financial or trading advice. Contract wording and applicable rules control. Verify current requirements and obtain qualified advice before acting.
Frequently asked questions
Is a lower fuel price enough to justify a stop?
Compare it with the complete incremental call consequence and the feasible alternative purchase.
Are costs different when the vessel is already calling?
The relevant incremental boundary can differ. Include only supported changes consistently across alternatives.
Does the crossover quantity recommend buying more?
No. The responsible fuel requirement remains the purchase basis.
Who confirms the timing assumptions?
The relevant vessel and port-side parties should assess the feasible plan; the commercial desk uses their supported inputs.