Hong Kong is pursuing green jet fuel produced from kitchen waste, and the price gap between that fuel and conventional kerosene sits at the centre of the effort, according to a South China Morning Post investigation into the city's sustainable aviation fuel ambitions.

The initiative ties the territory's airlines to one of the industry's most stubborn problems: sustainable aviation fuel costs substantially more than fossil jet fuel, and no carrier has found a way to absorb that premium at scale without passing it to passengers or regulators.

What is the plan?

The scheme draws on waste from Hong Kong's kitchens — used cooking oil and related food-industry residues — as feedstock for renewable jet fuel. The city generates that waste stream continuously, and converting it into fuel would give local producers a domestic input rather than imported crop-based alternatives that compete with food supply.

The approach mirrors the feedstock strategy used elsewhere in the sustainable aviation fuel sector, where waste oils are converted through hydroprocessing into drop-in fuel that meets jet-engine and regulator specifications.

Why is the cost the story?

The South China Morning Post's reporting frames the economics as the decisive constraint. Green jet fuel carries a significant premium over conventional fuel, and fuel already ranks among the largest operating costs for airlines. That arithmetic determines whether airlines adopt the fuel voluntarily or only under mandate.

For Hong Kong's carriers, the premium translates directly into fare and network questions: routes with thin margins are the least able to carry higher fuel costs, and cargo operations — a core business at Hong Kong International Airport — face the same exposure.

How does it fit the wider decarbonisation push?

Aviation accounts for a small but hard-to-abate share of global emissions, and sustainable aviation fuel is the industry's principal near-term lever. Regulators in Europe and parts of Asia have moved toward mandates that force blends into the fuel supply, shifting the cost question from whether airlines will pay to how the burden is distributed among carriers, passengers and governments.

Hong Kong's waste-to-fuel effort positions the territory to participate in that supply chain rather than import all of its compliant fuel, which matters if mandates reach Asian hubs.

What happens next?

The South China Morning Post's account suggests the venture's viability will turn on whether production costs can fall far enough, fast enough, to close the gap with kerosene — the same test that every sustainable aviation fuel project now faces.