Why CORSIA credit prices fall while jet fuel rises: demand mechanics, geopolitical risk, and liquidity
The key point is that fuel and offsets respond to different drivers. Jet fuel can rise quickly due to geopolitical and supply shocks, and aviation fuel indices do show volatility and abrupt moves during periods of tension. CORSIA Phase 1 spot prices, by contrast, can fall at the same time because they are driven by market microstructure: few active buyers, many sellers, wide spreads, and intermittent trading. Sources: IATA fuel monitor and market analysis on CORSIA spot prices. (iata.org, fastmarkets.com)
CORSIA demand is more “lumpy” than voluntary corporate demand. In the First Phase (2024–2026) the obligation applies only to routes between participating States, so demand is not uniform across an airline’s network and is not constant month to month. In addition, much procurement happens in internal windows (budget cycles, audits, tenders), with a “wait-and-see” approach when there is regulatory or price uncertainty.
Supply can suddenly become more “affordable” even if the projects’ intrinsic quality does not change. When the universe of usable units expands or the availability of tagged/eligible units increases, the market tends to reposition prices downward and compress the “CORSIA premium.” This is typical of markets with eligibility rules: it only takes an increase in perceived deliverable supply for spot prices to adjust.
Liquidity matters more than it seems. The CORSIA market is relatively small and less liquid, so a single tender or a large seller can move prices more than a gradual change in fuel costs would. And on the airline side, treasury tends to prioritize what is financially larger and more readily hedgeable in the short term—namely fuel hedging—while EEU purchases often follow more tactical strategies (spot or short-dated forwards, with price ranges). Public data on fuel consumption and fuel costs also show how fuel remains a dominant line item that is monitored continuously.
Political uncertainty around Article 6 and host-country authorizations can add a discount. If a buyer fears rule changes on authorization, corresponding adjustments, or alignment pathways, they may delay purchases or demand a lower price to compensate for risk. This effect can coexist with rising fuel prices because these are two different risks priced in two different markets.
CORSIA vs traditional VCM: differences in eligibility, registries, vintage, and integrity criteria
CORSIA looks more like a compliance regime than a “pure” voluntary market. Airlines can use only CORSIA Eligible Emissions Units (EEUs) from approved programs and registries, with rules on exclusions and traceability. In the traditional VCM the universe is broader, but quality is more heterogeneous and due diligence weighs more heavily on the buyer.
Vintage is not an operational detail—it is a constraint. ICAO publishes tables indicating, for each program, which vintage windows are allowed for a given compliance period (for example 2024–2026). In procurement you must verify program + period + vintage + any exclusions together, because “the project is good” is not enough to make it usable for CORSIA.
Registry tagging is often the point that creates costly mistakes. In practice there is a difference between a credit that “exists” on a registry and the same credit tagged for CORSIA with the correct attribute. The risk is buying units that look compatible but are not yet CORSIA-eligible at the time of transfer or retirement. This is one reason spreads can remain wide and liquidity fragmented.
Integrity has two layers that are starting to overlap. ICAO applies its own criteria to assess EEU eligibility, while in the VCM the ICVCM is emerging with the Core Carbon Principles (CCP) as an integrity benchmark and a shared language for procurement committees and reputational considerations. This means a unit can be compliance-eligible and, at the same time, not be the preferred choice for a buyer sensitive to reputational risk.
The claim completely changes how you buy. In the corporate VCM, the buyer thinks in terms of claims and communications (neutrality, contribution, etc.). In CORSIA the goal is to cover an obligation on covered routes, so what matters most is deliverability, regulatory risk, and auditability. ESG marketing is secondary to documentary evidence.
Operational impact on airlines: flight cuts, hedging, and alternative decarbonization strategies (SAF, efficiency, routes)
A fuel shock translates immediately into network decisions. When jet fuel rises due to geopolitical tensions or supply constraints, pressure hits yield management and capacity: marginal routes become candidates for cuts or reductions, and the network rebalances toward more profitable routes. This is consistent with the volatility observable in aviation fuel indices.
Hedging is asymmetric: structured fuel, more tactical carbon. Airlines generally have established policies to hedge fuel risk. For EEUs, many prefer flexibility because CORSIA demand depends on traffic, state pairs, and sectoral factors. Result: more spot purchases or short-dated forwards, more “event-driven” procurement, more requests for floors/ceilings in contracts. Data on fuel consumption and fuel costs help explain why fuel remains treasury’s priority.
SAF is internal abatement, but today it remains difficult to use as the only lever. Industry analysis indicates SAF volumes are still low relative to global consumption and the price premium can be high, so many airlines end up combining SAF where it is mandatory or strategic and EEUs where it is more economically efficient in the short term.
Operational efficiency reduces both fuel burn and CORSIA exposure. “No-regret” measures such as weight reduction, better fleet utilization, route optimization, and operational practices reduce consumption and therefore reduce offset needs. From a CFO perspective, the typical comparison is retrofit capex versus offset opex, with EEU price scenarios and delivery risk.
The First Phase makes planning part of compliance. Because the obligation applies only on routes between participating States, schedules, code shares, and network choices directly affect CORSIA exposure. This is not only an environmental topic; it is also a commercial and regulatory planning topic.
What happens to projects and developers: margin pressure, natural selection, and the risk of low-quality credits
Falling spot prices compress margins precisely where costs are rigid. Projects aiming to sell CORSIA-tagged units often bear MRV, governance, and registry costs that do not easily come down. If the market reprices downward, some developers may slow the pipeline or delay issuance, especially where implementation costs and benefit-sharing are structural.
Natural selection pushes toward “cheap,” and that is a quality risk. With buyers more price-sensitive, the probability increases that more low-cost volume clears, while high-integrity projects look for premium channels such as dedicated tenders or buying groups with tighter criteria. It is a delicate balance: the market may absorb more units, but not necessarily those that withstand reputational scrutiny best.
Eligible does not automatically mean “reputationally safe.” Even if a unit is CORSIA-eligible under ICAO rules, a corporate buyer or a financier may require additional integrity filters, such as CCP alignment, community rights, leakage, and permanence. This becomes even more true when media and stakeholders focus on credit quality, not only on eligibility.
Tagging and authorization timelines create cycles of glut and scarcity. There can be “potential” supply that is not immediately tradable as an EEU due to delays in registry tagging or host-country processes. This creates phases where there appears to be abundance and prices fall, followed by phases where real deliverability is tighter than it seemed.
Contracts become more legal and less “commercial.” Clauses increase on delivery conditions, representations and warranties of eligibility, and replacement mechanisms if status changes or challenges emerge. This is a natural response when the risk is not only price, but also regulatory status and audit outcomes.
Implications for buyers and investors: how to assess price, reputational risk, and future compliance (ICAO, Article 6, ICVCM)
A low price is not automatically a bargain if risk rises. A practical way to think about value is to treat it as risk-adjusted: unit price plus probability of non-delivery, plus risk of losing eligibility, plus reputational cost (for corporates), plus cost of capital (for those financing pipelines). If any of these terms increases, the “right price” falls even if the spot screen looks attractive.
Future compliance depends on phases and State participation. The timeline is clear: pilot 2021–2023, first 2024–2026, second 2027–2035. In the first phase, coverage depends on voluntary State participation and on state pairs, so forecasting EEU demand and forward pricing must start there, not from a generic idea of “global aviation.”
Article 6 comes in as a due diligence requirement, even when it is not formally required by everyone. The typical questions now appearing in procurement committees are very concrete: “is the unit authorized?”, “is there a host-country letter?”, “how is the corresponding adjustment handled?”. Uncertainty on these points can turn into a discount, or into a requirement for replacement units.
ICVCM CCP can become the second filter, useful for reputation and internal governance. Even when the objective is CORSIA compliance, CCP can be used as a shared language for internal policies, investor memos, and ESG ratings. In practice: ICAO says “you can use it,” CCP helps answer the question “should you use it, publicly and over time?”.
B2B examples are becoming frequent. An airline may buy EEUs for compliance, but then a corporate customer—perhaps for its own supply chain—asks for credits with additional labels or criteria. Or an investor finances a developer and includes covenants on integrity, registry audits, and contractual remedies if status changes.
Practical checklist for buying CORSIA credits with less risk: due diligence, contracts, buffers, and market signals to monitor
The first check is ICAO documentation, not the project brochure. Verify via ICAO sources: approved program, 2024–2026 compliance period, eligible vintage, applicable exclusions. Then verify on the registry that the units are tagged as CORSIA-eligible before signing or settling.
The second check is the chain of custody, because operational risk is real. Run KYC/AML on originators and intermediaries, check serial numbers and credit history, reduce the risk of double-selling, and clearly define the retirement process. This is what makes the asset auditable, especially in contexts with internal or external controls.
The contract must protect eligibility at transfer and at retirement. Include clauses on: (i) an “eligible at transfer and at retirement” condition, (ii) replacement units if status changes, (iii) force majeure linked to registries and tagging processes, (iv) dispute resolution. For large volumes, it makes sense to split into tranches and consider escrow.
A buffer is a risk-management choice, not waste. Building a small “compliance buffer” of extra units helps cover tagging delays, delivery slippage, and vintage mismatches. Diversifying by program, geography, and methodology also reduces concentration risk.
The signals to monitor are few but decisive. Track ICAO updates on state pairs and participation, EEU lists and eligibility tables, and news on new methodologies or expansions that can change pricing. Also watch procurement events in the aviation sector, because in a low-liquidity market they often set the short-term price.
