Marine biodiesel has become more competitive with conventional marine diesel in Europe, with prices in the Port of Rotterdam falling below those of fossil marine gas oil and sales of biodiesel blends more than doubling in the second quarter of 2026.
According to the market analysis cited by the Financial Times, marine biodiesel in Rotterdam recently fell to $985 per tonne on the Argus price index before recovering to around $1,240 per tonne. By comparison, marine gas oil had risen to $1,528.50 per tonne, following a sharp increase from $714.50 per tonne recorded in February 2026.
The price differential has emerged as higher petroleum costs and carbon-related expenses increase the effective cost of conventional marine fuels.
Rotterdam marine biodiesel gains a price advantage
Rotterdam is Europe’s major marine bunkering hub, making developments in the port an important indicator for the region’s alternative marine-fuel market.
The supplied source reports that sales of marine biodiesel blends in Rotterdam more than doubled in the second quarter of 2026 compared with the first quarter.
The increase coincided with a period in which fossil marine fuels became substantially more expensive. The source attributes the rise in marine gas oil prices to geopolitical tensions surrounding the Middle East and resulting disruptions affecting petroleum-product logistics.
Marine biodiesel prices have also been influenced by market and regulatory conditions. The source says producers have been seeking to increase sales partly to meet Dutch obligations under the EU Renewable Energy Directive III (RED III).
The reported $985-per-tonne price was described as an all-time low for the relevant marine biodiesel index before prices subsequently moved higher.
EU ETS costs further affect the fuel comparison
The headline fuel-price comparison does not capture the full cost of operating vessels on fossil marine fuels in the European market.
Ship operators using fossil fuels within the scope of the EU Emissions Trading System (EU ETS) face carbon allowance costs in addition to the underlying fuel price. According to Argus, incorporating those costs can make marine biodiesel more competitive against conventional marine fuels.
Madeleine Jenkins, a specialist in European biofuel prices at Argus, told the Financial Times that the shift in relative fuel economics could prompt shipowners to reconsider their procurement strategies.
She said marine biofuels can in some circumstances become more cost-effective than marine diesel when savings associated with lower emissions under European schemes are included.
The precise economic advantage, however, depends on the fuel price, feedstock, emissions performance, applicable carbon costs and vessel operating conditions.
Biodiesel can be used with limited vessel modifications
One factor supporting marine biodiesel deployment is its compatibility with existing marine engines. Biodiesel blends can generally be used as drop-in or near-drop-in fuels, although the specific blend, fuel specification and vessel requirements determine whether modifications or additional operational measures are necessary.
Biodiesel has lower energy density than fossil marine diesel. As a result, ships may require approximately 7–10% more fuel per voyage, according to the supplied report.
Consequently, comparing fuel prices on a per-tonne basis does not by itself establish the total operating-cost advantage. The amount of energy delivered, vessel efficiency and the applicable carbon costs also need to be considered.
Feedstock availability remains a constraint
Despite the recent price advantage, marine biodiesel faces a significant supply-side challenge. The sector relies heavily on waste-based feedstocks, including used oils and other residues from the food industry. These resources are limited and are also increasingly sought by other renewable-fuel markets.
A particularly important source of competition is sustainable aviation fuel (SAF). Aviation and maritime fuel producers can compete for some of the same waste-based feedstocks, potentially constraining the amount available for marine biodiesel.
Road transport is another competing source of demand for waste-derived biofuels. This means that a favourable marine-fuel price does not automatically translate into unlimited supply. The ability of marine biofuels to scale will depend partly on feedstock availability, collection systems, refining capacity and the regulatory value assigned to different fuels.
Rotterdam provides a test of marine biofuel economics
The developments in Rotterdam show how changes in fossil-fuel prices and carbon costs can alter the relative economics of lower-carbon marine fuels.
The second-quarter increase in biodiesel sales provides a market signal, but the source does not establish that the trend will continue. Biodiesel prices have already moved substantially from the reported $985-per-tonne low to approximately $1,240 per tonne.
For shipowners, the relevant comparison is therefore broader than the headline fuel price. Fuel energy content, vessel compatibility, emissions performance, EU ETS exposure and long-term availability all influence the economics of marine-fuel procurement.
Bioenergy Business Analysis
The Rotterdam market illustrates the growing importance of total fuel economics in marine decarbonisation. A lower biodiesel price becomes particularly relevant when conventional marine fuel is simultaneously exposed to higher petroleum costs and carbon-related charges. However, the advantage needs to be assessed on an energy-equivalent and voyage-specific basis rather than simply by comparing tonnes of fuel.
The more structural challenge is feedstock availability. Waste oils and other residual feedstocks are already being pursued by road transport and SAF markets, creating competition for resources that cannot necessarily expand at the same rate as fuel demand. Marine biodiesel therefore has an opportunity to gain market share when its delivered economics are favourable, but sustained growth will depend on both regulatory incentives and the availability of eligible feedstocks.
The Rotterdam sales increase is consequently an important market development, while the movement in prices also demonstrates how quickly the relative economics of marine biofuels can change. Continued monitoring of biodiesel prices, fossil-fuel costs, EU carbon pricing and feedstock markets will be important for assessing whether the current shift becomes a more durable feature of European marine-fuel procurement.
The immediate development is the reported more-than-doubling of marine biodiesel blend sales in Rotterdam in the second quarter of 2026, alongside a period in which the Argus-indexed price of marine biodiesel fell below marine gas oil.
