The Rotterdam Biodiesel Price Shock
September 21, 2026
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ShipUniverse Maritime Fuel Decision Report
Biodiesel Just Beat Marine Gas Oil. Does the Math Actually Hold?
Rotterdam B100 briefly collapsed to record-low pricing while marine
gasoil surged. The headline looks simple. The economics are not.
Energy density, EU ETS, FuelEU, certification and the ship's fuel
system can each change the result.
Rotterdam price tape
Sep 2026
B100 biodiesel
$1,240
Rebounded after briefly touching $985/t.
Marine gasoil
$1,528.50
September 20 comparison level.
VLSFO
$710
Rotterdam September 18 indication.
B100 moved by hundreds of dollars per tonne within days.
A bunker decision therefore needs a break-even price, not simply
today's screen price.
Rotterdam recently produced a fuel-price relationship that would have looked improbable only months earlier. B100 biodiesel fell as low as $985 per tonne before rebounding toward $1,240, while marine gasoil moved above $1,500 per tonne.
But one tonne of B100 does not replace one tonne of MGO. FAME biodiesel contains about 37 MJ/kg of energy versus roughly 42.7 MJ/kg for marine gasoil. Equal energy therefore requires approximately 15.4% more B100 by mass.
Apply that correction to $1,240 B100 and the effective MGO-energy-equivalent price becomes roughly $1,431 per tonne. Against $1,528.50 MGO, biodiesel is still about $97 cheaper per equivalent tonne before EU carbon compliance enters the calculation.
The price inversion
One bunker price produces three different answers
Headline price
-$288.50
B100 per physical tonne
The obvious headline advantage versus $1,528.50 MGO,
before adjusting for lower energy content.
Energy corrected
-$97
B100 per MGO-equivalent tonne
The additional B100 mass absorbs roughly two thirds of the
headline discount, but does not eliminate it.
Higher B100 case
+$154
Energy-adjusted premium at $1,418 B100
The September 18 assessment shows how quickly the energy-only
comparison can flip before compliance is counted.
Energy normalization
The tonne price is the wrong comparison
B100 FAME energy
37 MJ/kg
EU renewable-fuel reference.
MGO energy
42.7 MJ/kg
FuelEU fossil MGO reference.
Additional B100 mass
+15.4%
Required for equal MGO energy.
B100 MGO-equivalent
~$1,431
At a $1,240/t B100 bunker price.
Fuel decision board
B100 still clears MGO after the energy correction
VLSFO remains the harder economic hurdle before compliance effects.
| Fuel | Price | Energy | Equal-energy quantity | Normalized cost | Current position |
|---|---|---|---|---|---|
| B100 FAME | $1,240/t | 37.0 MJ/kg | 1.154 t per MGO-equivalent tonne | $1,431/MGOe | Below MGO |
| MGO | $1,528.50/t | 42.7 MJ/kg | 1.000 t | $1,528.50/MGOe | Approximately $97/MGOe above B100 |
| VLSFO | $710/t | 40.5 MJ/kg modeled | 1.000 t | $710/VLSFOe | Cheaper on energy |
VLSFO remains the tougher benchmark.
At $1,240/t B100, equal VLSFO energy costs roughly $1,357.
That leaves an energy-only premium of about $647 per VLSFO-equivalent
tonne before ETS, FuelEU, pooling or other compliance value.
Voyage stress test
Replace 500 tonnes of MGO energy with B100
MGO reference
500 t
Reference voyage energy.
B100 required
577 t
About 77 additional tonnes.
Fuel-only difference
-$48.7K
B100 cheaper at the headline price.
Full ETS exposure
~$160K
Approximate MGO carbon cost avoided.
At an EUA price near €86.89/tCO2, MGO's fossil emission factor
implies roughly $319 of ETS exposure per tonne of MGO
when 100% of voyage emissions fall inside ETS scope.
Eligible sustainable B100 can be zero-rated for ETS CO2 when the
documentation is valid.
Voyage profile
Route exposure can change the decision
EU to EU
ETS 100%
FuelEU 100%
Highest B100 leverage
The full voyage energy sits inside the major EU compliance calculations, making certified low-GHG B100 most valuable here.
EU to non-EU
ETS 50%
FuelEU 50%
Moderate leverage
Only half of the voyage enters the principal EU calculations, reducing the regulatory value available to offset B100's cost.
Outside EU
ETS 0%
FuelEU 0%
Fuel economics dominate
The comparison falls back toward energy-adjusted bunker price, availability and onboard operating considerations.
Compliance crossover
B100 can cross the VLSFO line once compliance is counted
B100 vs VLSFO
-$45/t
ENGINE September 8 compliance-adjusted EU-EU comparison.
B100 vs LSMGO
-$594/t
Same energy and compliance-adjusted snapshot.
FuelEU 2026 intensity
89.34
gCO2e/MJ maximum annual GHG intensity.
Deficit penalty reference
€2,400
Per VLSFO-equivalent tonne of FuelEU deficit.
FuelEU value is not a universal credit per tonne of B100.
It depends on the certified feedstock pathway, annual vessel fuel mix,
pooling, banking, borrowing and the commercial value assigned to
surplus compliance.
Ship readiness
The fuel price is irrelevant if the ship is not ready
| Check | Risk | Failure mode | Response | Priority |
|---|---|---|---|---|
| OEM approval | Engine compatibility | Combustion or component problems | Confirm permitted FAME concentration and OEM operating guidance. | Before bunker |
| Proof of Sustainability | Regulatory eligibility | Loss of ETS or FuelEU value | Match documentation to the delivered quantity and pathway. | Critical |
| Tank water | Microbial growth | Sludge and filter blockage | Drain water and increase tank monitoring. | High |
| Storage duration | Oxidation | Acidity and deposits | Avoid treating B100 as long-term inventory where possible. | High |
| Cold-flow properties | Feedstock dependent | Restricted flow and blocked filters | Confirm cloud point and appropriate tank temperature. | Route dependent |
| Seals and hoses | Materials compatibility | Leaks or degradation | Check system materials for high-FAME service. | Inspect |
| Initial filters | Solvent cleaning effect | Rapid blockage after switching | Carry spares and monitor closely during initial changeover. | Transition |
Supply reality
Rotterdam is liquid. Global B100 supply is not.
More than 60 ports have reported marine biofuel supply
Availability remains concentrated, particularly in major European
and Asian bunker hubs.
Rotterdam carries disproportionate market weight
Price formation there can make B100 appear much more economically
accessible than it is on less-developed bunker routes.
B100 is not one uniform commodity
Feedstock pathway changes lifecycle GHG intensity, regulatory value,
cold-flow behavior, sustainability documentation and price.
Research anchors
Data behind the comparison
Rotterdam fuel market
Argus-linked reporting, ENGINE and Ship & Bunker September 2026
B100, MGO and VLSFO assessments.
Energy and compliance
EU Renewable Energy Directive, FuelEU Maritime rules,
European Commission ETS guidance and European carbon-market data.
Technical operation
DNV marine biofuel guidance and ISO 8217:2024 fuel-quality framework.
Interactive fuel economics
B100 Break-Even Desk
Change the bunker price, voyage exposure and compliance assumptions to see exactly where B100 crosses MGO or VLSFO.
Fuel market
$1,240/t
$1,528.50/t
500 t
EU exposure
100%
€86.89/tCO2
$0/t
Additional assumptions
Effective voyage comparison
B100 is ahead in this scenario
Equal-energy fuel cost plus selected compliance effects.
$0
modeled voyage difference
How the economics move
Energy spread
$0
EU ETS benefit
$0
FuelEU value
$0
Handling cost
$0
B100 required for equal energy
0 t
Physical B100 required to replace selected fossil energy.
Energy-density penalty
0%
Additional B100 mass before operational differences.
Normalized B100 cost
$0/t
Cost per fossil-equivalent tonne of energy.
Fossil ETS cost
$0/t
Carbon cost per fossil tonne at selected scope.
Maximum B100 bunker price at parity
$0/t
B100 moves above the selected fossil option beyond this price,
given the current assumptions.
Additional compliance value needed
$0/t
Additional FuelEU or pooling value required for parity.
This is a screening model rather than a bunker quotation or formal
FuelEU compliance calculation. Actual economics depend on certified
feedstock pathway, annual fuel mix, banking, borrowing, pooling,
engine approval and vessel-specific consumption.
