New tide for marine propulsion

Biofuels are emerging as one of the most promising green alternatives to conventional marine fuels. Their production from renewable feedstocks significantly reduces lifecycle greenhouse-gas emissions compared with fossil fuel alternatives, and many biofuels are “drop-in” compatible. Stringent regulations like the European Union’s FuelEU Maritime directive are driving demand for lower-carbon marine energy and biofuels offer a proven pathway to compliance. The directive targets mandates that progressively increase the share of renewables in ships’ energy mix, rising from 2% in 2030 to 40% by 2050. By incorporating FAME, HVO or renewable synthetic diesel, operators can immediately reduce their fuel carbon intensity (FCI) and avoid penalties linked to non-compliance. Together, these factors make biofuels a scalable, practical bridge to fully decarbonised shipping. Yet beneath the optimism lies a stubborn challenge: the lower energy density of most biofuels. This is not just a frustrating technicality, it directly impacts a vessel’s range, power and operating costs. Nevertheless, thanks to increasing green regulation at regional...