South Korean refiner S-OIL has launched commercial supply of B30 VLSFO marine biofuel blend from an integrated production hub in Ulsan to help global shipowners meet strict environmental regulations without engine retrofits. The move leverages localized blending infrastructure and strong shareholder backing from Saudi Aramco to expand S-OIL’s low-carbon energy portfolio for high-demand maritime sectors.
Ulsan, South Korea | July 22, 2026 – South Korean refiner S-OIL has officially commenced the commercial supply of B30 Very Low Sulfur Fuel Oil (VLSFO) biofuel blend, marking a major strategic move to address tightening global maritime decarbonization mandates and the surging demand for low-carbon fuels.
The initiative establishes an integrated, localized supply chain centered in the Ulsan port area, positioning S-OIL to capitalize on regional demand, particularly from car carriers and commercial ocean-going vessels operating out of North Asia.
Strategic Regional Hub: Integrated Ulsan Value Chain
A defining advantage of S-OIL’s new bio-bunkering framework is its end-to-end integration within the Ulsan maritime and industrial cluster. S-OIL has connected its primary VLSFO production at the Onsan Refinery with local biofuel production facilities and storage infrastructure.
- Raw Material Sourcing: Securing sustainable biofuel feedstocks locally within the region.
- S-OIL Onsan Refinery VLSFO: Producing standard Very Low Sulfur Fuel Oil at the Onsan facility.
- Localized Blending & Storage: Combining feedstocks into a B30 blend (30% biofuel / 70% VLSFO) and storing it using nearby Ulsan infrastructure.
- Ulsan Port Bunkering: Delivering the finished low-carbon fuel directly to ships, particularly car carriers, operating out of Ulsan Port.
By consolidating feedstock sourcing, blending, storage, and direct supply within a single geographic zone, S-OIL drastically reduces manufacturing-related transit logistics, streamlines operational overhead, and ensures rapid delivery times.
“In the emerging bio-marine fuel market, competitiveness hinges not just on product quality, but on securing stable feedstocks and maintaining an efficient supply infrastructure,” S-OIL stated. “Leveraging our established bunkering capabilities and Onsan’s superior supply setup, S-OIL will deliver reliable, cost-effective low-carbon fuels to global ocean carriers.“
Immediate Compliance for Shipping Operators
Bio-marine fuel blended at 30% sustainable biofuel and 70% conventional VLSFO (B30 VLSFO) serves as a “drop-in” fuel solution. It requires no costly engine retrofits or structural vessel modifications, allowing shipowners to achieve immediate carbon reductions.
The rollout directly supports shipowners navigating increasingly stringent international environmental frameworks, including:
- IMO GHG Strategy: Intermediate targets aiming for net-zero emissions by or around 2050.
- EU ETS & FuelEU Maritime: Regulatory pressure penalizing carbon-intensive marine fuels on European trade lanes.
Ulsan Port is a key hub for Pure Car and Truck Carriers (PCTCs) and bulk shipping, sectors under intense pressure from global OEMs and charterers to audit and reduce Scope 3 supply chain emissions. S-OIL’s localized B30 supply gives these operators an immediate operational pathway to meet baseline compliance and customer decarbonization targets.
Market Implications & S-OIL’s Broader Energy Vision
This commercial launch reflects a broader effort among major Asian refiners to diversify beyond conventional oil products into alternative energy portfolios. S-OIL plans to use this initial launch as a foundation to expand its eco-friendly marine fuel offerings, catering to evolving global compliance standards.
About S-Oil Corporation
Established in 1976, S-Oil Corporation has grown into one of Asia-Pacific’s premier refining and petrochemical entities. Located in the Onsan Industrial Complex in Ulsan, the company operates a crude refining capacity of 669,000 barrels per day (bpd) alongside world-scale lube base oil and petrochemical facilities, including the world-class Xylene Center and advanced Residue Upgrading Complex (RUC/ODC) completed in 2018.
With Saudi Aramco as its majority shareholder since 2015, S-OIL leverages global crude sourcing security, operational scale, and high-efficiency refining assets to drive its vision of becoming a highly competitive, innovative, and trusted energy and chemical provider.
Source: S-Oil Corporation