A provisional agreement between the European Parliament and EU governments would raise the Market Stability Reserve allowance invalidation threshold in the EU Emissions Trading System (ETS). The threshold would increase from 400 million allowances to 700 million, altering the framework for potential future supply adjustments. The change is linked to how allowances are managed when surplus levels become excessive.
The agreement was reached on 20 October, and the agreed text was published on 28 October. Formal approval is still required before the changes can enter into force. Until then, the updated threshold is not yet legislation in force.
The adjustment is expected to affect European carbon market expectations and the carbon costs faced by importers under the Carbon Border Adjustment Mechanism (CBAM). The higher threshold does not set a fixed carbon price or guarantee that additional allowances will be released into the market.
Market Stability Reserve changes for allowance invalidation
The Market Stability Reserve (MSR) was introduced to manage fluctuations in emissions allowance supply under a declining ETS cap. Variations in industrial production, energy consumption and hedging activity can influence how many allowances circulate in the market. When surplus becomes excessive, allowances can be withdrawn from auctions and transferred into the reserve.
Under the MSR framework, a portion of accumulated allowances can be invalidated, leading to permanent cancellation. The provisional agreement would raise the invalidation threshold to 700 million allowances from the existing 400 million level. This would keep a larger volume of allowances available within the reserve framework for potential future intervention.
Retaining allowances in the reserve does not mean they will automatically return to circulation. Any release remains subject to applicable regulatory conditions and market rules. The provisional text also preserves an invalidation mechanism alongside safeguards against an excessive allowance surplus.
The deal reflects a compromise between institutional positions. The European Commission had proposed ending invalidation indefinitely, while the Council’s earlier negotiating position included a temporary suspension followed by an increase in the threshold. The agreed figure of 700 million is presented as the relevant threshold in the latest negotiating position.
CBAM reference prices tied to ETS auction outcomes
Changes in expected EU allowance availability are relevant for CBAM because certificate prices are linked to EU ETS auction clearing prices. For 2026, the European Commission calculates CBAM reference prices using quarterly weighted averages of auction prices. From 2027, reference price publication frequency would shift to weekly.
The MSR adjustment therefore has implications beyond immediate auction results. Expectations about future allowance supply and demand can affect hedging strategies, investment decisions and carbon-price assessments before any reserved allowances are released. A larger reserve may reduce concerns about an abrupt shortage of allowances.
Even with a higher reserve buffer, carbon price direction remains dependent on factors including the ETS cap, release rules, economic growth and the pace of industrial emissions reductions. The agreement does not provide a guaranteed reduction in EUA prices or a predetermined discount on CBAM certificates. Its direct effect concerns future allowance availability rather than a fixed change in import charges.
Separating reserve thresholds from broader market variables
Market participants are expected to distinguish between total allowance stock, scheduled auction volumes and actual releases from the MSR when assessing the agreement. Although a higher invalidation threshold preserves a larger potential supply buffer, it does not automatically change how much is offered in individual auctions. The shift from 400 million to 700 million is therefore not treated as an automatic alteration of auction volumes.
Carbon price forecasts continue to rely on multiple variables beyond the revised threshold. These include allowances in circulation, fuel switching in the power sector, industrial output, speculative positioning, auction schedules and expected emissions abatement. The factors involved do not move mechanically due to changes in invalidation thresholds alone.
As a result, estimating a specific euro-per-tonne reduction in carbon prices based only on this agreement would not capture uncertainty around future supply and demand. For importers, scenario-based carbon price assumptions can be used to assess sensitivity of expected CBAM liabilities. However, any change in EUA prices represents only one component of CBAM calculations.
CBAM compliance obligations continue for importers
A larger allowance buffer could reduce one source of extreme carbon-price volatility for companies importing covered products into the EU. It does not remove underlying compliance obligations under CBAM. Importers must establish embedded emissions for covered goods and apply relevant benchmark adjustments.
Companies also need to provide evidence of eligible carbon prices paid in the country of production. A lower expected allowance price could reduce the monetary value of certificate obligations tied to those prices. Higher embedded emissions or insufficiently reliable production data could offset that potential benefit.
This creates two areas of exposure for CBAM-covered companies: financial risk linked to movements in carbon market prices and reporting risk related to accuracy and availability of emissions information. The distinction remains relevant when importers assess procurement costs and negotiate carbon-related provisions with international suppliers.
Implications for industrial investment horizons
The agreement also affects investment decisions by European industrial manufacturers evaluating decarbonisation options. Companies assessing carbon capture installations, electric furnaces and hydrogen-based production processes must compare capital expenditure and operating costs with expected EUA prices over investment horizons extending a decade or more.
A reserve mechanism that moderates extreme carbon-price increases could support greater predictability for industrial planning. At the same time, if carbon prices remain persistently weaker, payback periods for investments aimed at reducing emissions could extend. Policymakers are therefore balancing market stability with incentives for industrial decarbonisation while maintaining consistency between ETS cap outcomes and EU climate targets.
Next ETS review after 2030
The next major policy stage will be a broader review of the EU Emissions Trading System focused on post-2030 conditions. Governments are expected to revisit allowance supply, industrial protection measures and market-condition frameworks after 2030 during that review process.
The October provisional agreement reflects political preference for a more stable carbon market framework through a larger allowance retention threshold and continued safeguards against excessive surpluses. However, it has not completed formal approval and should not be treated as legislation already in force. Future EUA price movements will continue to be determined by market conditions and ETS operation rather than by a legislated price level.