Beyond the Blend Wall: How Pyrolysis Could Put Plastic Waste in Aviation's Fuel Tank

Aviation has spent a decade being told it is the hardest sector to decarbonise, and the fuel supply chain is where that difficulty becomes concrete. Under the EU’s ReFuelEU Aviation Regulation, every litre of jet fuel uplifted at an EU airport has had to contain at least 2% sustainable aviation fuel (SAF) since the start of 2025. That share climbs to 6% in 2030, 20% in 2035 and 70% by 2050, with a separate synthetic-fuel sub-target layered on top. The trajectory is fixed in law, the penalties for suppliers who miss it are real, and the airlines have nowhere else to turn.

The problem is not political will. It is molecules. The feedstocks that dominate SAF production today are finite, and the industry is already bumping against their limits. That is why attention across 2026 has turned back to a resource Ireland produces in abundance and struggles to manage: hard-to-recycle plastic waste. Converted through pyrolysis, it may have a role in aviation’s fuel mix that few operators have priced in.

The feedstock squeeze behind the SAF mandate

Most SAF in the market is HEFA fuel, made by hydroprocessing esters and fatty acids — in practice used cooking oil, tallow and other waste fats and oils. It is a proven pathway with an established supply chain, but the raw material is scarce. Global collection of used cooking oil is broadly flat, competition from renewable diesel is fierce, and questions about the provenance of imported material have made buyers cautious. Analysts have warned for two years that HEFA feedstock cannot stretch to cover the back half of this decade’s mandates.

The alternatives are still scaling. Alcohol-to-jet and gasification with Fischer-Tropsch synthesis can use agricultural residues, forestry waste and municipal solid waste, but few commercial-scale plants are running in Europe. Power-to-liquid fuel, made from green hydrogen and captured carbon dioxide, is the long-term answer for synthetic fuel but remains expensive and energy-intensive. Between the feedstock that is running short and the technologies that are not yet built out, there is a gap. Aviation calls it the blend wall: the point at which mandated SAF demand outruns available supply and the price of compliance climbs sharply.

Recent commercial activity shows where some of that gap may be filled. In late August 2026, Chinese technology group Niutech signed an agreement with a global energy major to supply an industrial continuous waste-plastic pyrolysis line with a single-unit throughput of 10,000 to 50,000 tonnes a year, explicitly aimed at producing pyrolysis oil for SAF. It is one deal, not a market, but it signals that plastic-derived feedstock is being taken seriously by companies that need volume.

Where pyrolysis enters the aviation fuel chain

Pyrolysis breaks down mixed and contaminated plastic waste at high temperature in the absence of oxygen, producing a hydrocarbon liquid commonly called pyrolysis oil. That oil is not jet fuel. It is an intermediate: a synthetic crude that must be upgraded, hydrotreated to remove contaminants such as chlorine and nitrogen, then refined and fractionated into a kerosene-range product that meets the ASTM D7566 specification before it can be blended into aviation fuel.

This matters for two reasons. First, it means pyrolysis operators are unlikely to sell directly to airlines. Their customer is a refiner or a dedicated upgrading facility that integrates plastic-derived oil into an existing hydroprocessing unit or a purpose-built line. Second, it means feedstock quality and consistency are decisive. A refiner co-processing pyrolysis oil needs a stable specification, low levels of catalyst poisons and reliable volume. The value in the chain accrues to whoever can guarantee that, which puts a premium on well-sorted, well-characterised polymer streams rather than mixed residual waste.

The environmental logic is also different from combustion. Sending plastic to an incinerator with energy recovery releases its embedded carbon immediately. Pyrolysis followed by fuel upgrading still results in that carbon being burned in an engine, but it displaces an equivalent volume of fossil crude and, under a proper lifecycle assessment, can deliver a meaningful greenhouse-gas saving against the jet fuel it replaces. Whether it does so in any given case depends entirely on the process energy, the hydrogen source and the counterfactual for the waste.

What ‘recycled carbon fuel’ status actually requires

ReFuelEU Aviation does not treat plastic-derived kerosene as automatically sustainable. Fuels made from non-renewable waste streams can qualify as recycled carbon fuels, a defined category that counts towards the mandate, but only if they meet strict conditions. The waste must genuinely be waste, not material that could have been mechanically recycled. The production pathway must achieve a lifecycle emissions reduction against a fossil comparator, verified to a threshold set in the regulation. And the whole chain, from waste collection to fuel certification, must be traceable through an approved voluntary scheme.

A plastic-derived fuel does not become compliant simply because waste plastic went in at one end. Eligibility turns on the nature of the feedstock, the carbon intensity of the conversion, chain-of-custody documentation and independent certification. For a waste holder in Ireland, that has a practical consequence: the paperwork and the segregation discipline are not administrative overhead, they are what determines whether your material can enter the aviation supply chain at all. Operators who invest early in characterisation, mass-balance accounting and scheme membership will be the ones refiners can actually buy from.

The implications for Irish waste holders and operators

Ireland generates several hundred thousand tonnes of plastic waste each year, a large share of which is currently exported, landfilled or sent for energy recovery because it cannot be mechanically recycled to a useful standard. The Circular Economy Strategy 2026-2028 and the EU Packaging and Packaging Waste Regulation are already pushing that material towards higher-value routes for packaging applications. Aviation fuel adds a second demand signal for the fraction that is too degraded or too mixed even for chemical recycling back into polymers.

For manufacturers, retailers and logistics operators producing plastic waste, the message is consistent with everything else happening in resource policy: segregation quality is becoming a revenue lever. Clean, well-sorted polyolefin streams have multiple competing buyers. Mixed residual waste has none. For the waste and resource-recovery sector, plastic-to-fuel broadens the potential offtake market beyond domestic reprocessors to include the refining and energy majors now investing in upgrading capacity, though it also means competing on specification and traceability rather than gate fee alone.

There are caveats worth stating plainly. Plastic-derived SAF is at an early stage of commercial deployment in Europe. The regulatory detail around recycled carbon fuels is still being worked through. And there is a legitimate policy debate about whether scarce plastic waste should be turned into fuel and burned at all, rather than kept in the materials economy. Advanced recycling into polymers should take precedence where the feedstock allows it. Fuel is the route for what is left.

Positioning for 2027 and 2030

The SAF mandate steps up well before 2030. Suppliers are contracting feedstock now for volumes they will need in three and four years’ time, and the upgrading capacity being announced today is being designed around the feedstock its backers believe they can secure. Waste holders and operators who establish the characterisation data, certification and offtake relationships over the next 18 months will be positioned as a known, compliant source when the demand curve steepens. Those who wait will be negotiating into a tighter market against buyers who already have their supply locked in.

Talk to Premier Green Energy

Premier Green Energy works with Irish manufacturers, waste operators and local authorities to turn hard-to-recycle plastic waste into certified feedstock for advanced recycling and recovered-fuel applications. If you want to understand how the SAF mandate and recycled carbon fuel rules could affect the value of your plastic waste streams, contact our team at pge.ie for a feedstock and offtake assessment.