Japan is stepping up efforts to convert cooking oil into sustainable aviation fuel, according to a Reuters report, as the country races to build a domestic supply of a fuel that carriers worldwide will increasingly need to meet emissions targets and, in some markets, mandates.

The report centers on used cooking oil — a waste feedstock that refiners can process into hydroprocessed esters and fatty acids, one of the established SAF pathways already certified for commercial use. For Japan, the attraction is straightforward: the country has limited agricultural land for crop-based feedstocks and no domestic fossil-oil surplus, but it generates substantial volumes of waste cooking oil from its large food-service sector. Collecting and refining that waste stream gives Japan a feedstock it controls at home, rather than importing energy.

The timing matters for Japanese airlines. ANA and Japan Airlines, the country's two main carriers, have both flown passenger services powered by SAF blends and have signed offtake and demonstration arrangements with domestic and foreign suppliers. The Japanese government, for its part, has set a target for SAF to account for 10% of jet fuel used by Japanese carriers by 2030 — a goal that currently sits well above the country's production capacity, which is why the push on cooking-oil collection and refining has intensified.

The economics remain the central problem. SAF made from waste oils trades at a substantial premium over conventional jet fuel, and feedstock supply is finite and increasingly contested as refiners in Europe, North America and Asia chase the same waste oils for both aviation fuel and renewable diesel. A country that wants to scale cooking-oil-based SAF must build not just refining capacity but collection logistics — aggregating waste oil from restaurants, food processors and households at the volume and quality refineries require. That collection infrastructure, more than the refining technology, typically determines how fast a national SAF program can grow.

Regulatory pressure is also moving the market. Japan's 2030 target follows the direction set elsewhere: the European Union's ReFuelEU rules phase in SAF blending obligations at EU airports from 2025, the United Kingdom has legislated a mandate from 2027, and Singapore has announced a target of its own. Japanese carriers flying into those jurisdictions will face blending requirements regardless of what happens domestically. A domestic supply chain built on cooking oil would let Japanese airlines meet those obligations partly with home-produced fuel, insulating them from import price swings.

The Reuters report does not specify which companies are expanding collection or refining capacity, the volumes involved, or a timeline for new plants. Those details will determine whether the effort changes the supply picture materially: Japan's existing SAF production is small relative to its airlines' fuel burn, and the 2030 target implies a step change in output, not an incremental one.

What is established is the pathway itself. HEFA-based fuel from used cooking oil is certified under ASTM D7566 and is already burning in commercial engines at blends up to 50% with conventional jet fuel — meaning the constraint on Japan's program is feedstock volume, refinery build-out and cost, not airworthiness.

For Japanese airlines, the cost question is direct. Fuel is the largest single operating expense for most carriers, and every percentage point of SAF blending at current premiums adds to it. Whether cooking-oil collection can scale fast enough, and cheaply enough, to close the gap between Japan's current output and its 2030 target will be the measure of the program's success — and with the deadline under six years away, the country will need to move from collection pilots to industrial-scale refining quickly to get there.