Rotterdam marine biodiesel blend sales in the second quarter were above those in Singapore, according to official data from both ports, the first quarter this has happened since the EU imposed anti-dumping duties (ADDs) on Chinese-origin biodiesel in the third quarter of 2024. Marine biodiesel blend sales in the Port of Rotterdam were up sharply on the year and more than double the previous quarter (see table). Market participants reported firmer demand following the start of the US-Iran war. The war changed pricing dynamics between marine biodiesel blends and conventional fuels, leading to discounts for the former. These initially failed to support significant demand growth, evidenced by declining sales in the first quarter. Then, volatility weighed on overall trading activity and buyers were hesitant to make significant changes to their procurement strategy based on what was perceived as an acute price spread at the time. But demand rose as the war extended, which led to higher blend sales in the second quarter. An initial agreement to end the war was signed on 18 June by the US and Iran, which led to easing conventional fuel prices and a return to traditional dynamics, with fossil bunker fuels back at a discount to marine biodiesel blends. But this agreement collapsed and hostilities resumed, leading to sharp increases in oil futures prices and a return to discounts for some marine biodiesel blends. B100 Advanced fatty acid methyl ester (Fame) dob Netherlands has averaged a discount of about $86/t to marine gasoil (MGO) dob ARA since hostilities restarted, when accounting for EU emissions trading system (ETS) costs for an intra-EU voyage. In that time, Singapore marine biodiesel prices — which had been mostly cheaper than EU equivalents — posted sharp gains and sales fell as a result. EU ADDs on Chinese-origin biodiesel supported flows into Singapore, which ended up in the bunker pool, resulting in cheaper prices and higher sales than Rotterdam for more than 18 m