A provisional agreement between the European Parliament and EU governments would raise the Market Stability Reserve allowance invalidation threshold from 400 million to 700 million. The change would adjust the framework for potential future supply measures in the EU Emissions Trading System (ETS). The deal 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.
The adjustment is expected to affect European carbon market expectations and carbon costs faced by importers under the Carbon Border Adjustment Mechanism (CBAM). A higher threshold does not set a fixed carbon price. It also does not guarantee that additional allowances will be released into the market.
Market Stability Reserve invalidation threshold revised
The Market Stability Reserve (MSR) is designed to manage fluctuations in emissions allowance supply under a declining ETS cap. Changes in industrial production, energy consumption, and hedging activity can influence how many allowances circulate in the market. When surplus allowances become excessive, the system can withdraw allowances from auctions and transfer them into the reserve. A portion of accumulated allowances can then be invalidated, leading to permanent cancellation.
Under the provisional agreement, the invalidation threshold would increase to 700 million allowances, compared with the current 400 million. This would keep a larger volume of allowances within the reserve framework for possible future market intervention. The agreement also states that retaining allowances does not automatically return the entire reserved volume to circulation. Any release remains subject to regulatory conditions and market rules.
The provisional text reflects a compromise between institutional positions. The European Commission had proposed ending invalidation indefinitely, while the Council’s earlier negotiating stance involved a temporary suspension followed by an increase in the threshold. The agreed approach keeps an invalidation mechanism while adding a safeguard against an excessive allowance surplus. The 700 million figure is presented as the relevant threshold in the latest negotiating position rather than previously discussed 800 million or proposals for unlimited retention.
CBAM reference prices tied to ETS auction clearing
The MSR-linked change is 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, publication frequency for reference prices would shift to weekly. As a result, the potential impact extends beyond immediate auction outcomes.
Expectations about future allowance supply and demand can affect hedging strategies, investment decisions, and carbon-price assessments before any reserved allowances are actually released. A larger reserve could reduce concerns about an abrupt shortage of allowances. However, carbon price direction would still depend on factors including the ETS cap, release rules, economic growth, and industrial emissions reduction pace. The agreement does not establish a guaranteed reduction in EUA prices or a predetermined discount on CBAM certificates.
Allowance stocks, auctions and MSR releases treated separately
Market participants are expected to distinguish between total allowance stock, scheduled auction volumes, and actual releases from the MSR when assessing the agreement. Although the higher invalidation threshold preserves a larger potential supply buffer, it does not automatically change how much is offered in individual auctions. Carbon price forecasts would continue to require assessment of multiple variables beyond the revised threshold. These include allowances in circulation, fuel switching in power generation, industrial output, speculative positioning, auction schedules, and expected emissions abatement.
The source material indicates that these factors do not respond mechanically to changes in the invalidation threshold. It also states that estimating a specific euro-per-tonne reduction in carbon prices based on the agreement alone would not reflect uncertainty around future supply and demand. For importers, scenario-based assumptions about carbon prices can be used to measure sensitivity of expected CBAM liabilities. Even so, changes in EUA price expectations are 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 compliance obligations under CBAM. Importers must continue establishing embedded emissions for covered goods and applying relevant benchmark adjustments. They must also provide evidence of eligible carbon prices paid in the country of production.
The material notes that lower expected allowance prices could reduce the monetary value of a given certificate obligation. Higher embedded emissions or insufficiently reliable production data could offset that effect. It identifies two exposure areas for CBAM-covered companies: financial risk tied to movements in carbon market prices and reporting risk linked to accuracy and availability of emissions information. This distinction remains relevant when importers assess procurement costs and negotiate carbon-related provisions with international suppliers.
EUA price expectations for industrial investment planning
The agreement also has implications for 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 allowance prices over investment horizons extending a decade or more. The source material states that an MSR mechanism capable of moderating extreme carbon-price increases could improve predictability for industrial planning.
At the same time, it says a persistently weaker carbon price signal could extend payback periods for investments intended to reduce emissions. Policymakers are therefore described as needing to balance carbon market stability with maintaining incentives for industrial decarbonisation. The same balancing requirement includes ensuring that ETS emissions cap settings remain consistent with EU climate targets.
Next ETS review expected after 2030
The next major policy stage will be a broader review of the EU Emissions Trading System. During this review, governments are expected to revisit allowance supply, industrial protection measures, and market-condition frameworks after 2030. The October provisional agreement reflects a political preference for a more stable carbon market framework through a larger allowance retention threshold and continued safeguards against excessive surpluses.
The deal has not yet completed formal approval and should not be treated as legislation already in force. Future EUA price movements would continue to be determined by market conditions and ETS operations rather than by a legislated price level.