The ECB's introduction of climate factors into collateral valuation directly addresses how climate-related financial risks are integrated into prudential risk management and capital adequacy frameworks for banks.
Mandatory inheritance: Prudential Standards requires Governance as a parent tag, reflecting the ECB's governance-level decision to embed climate risk into regulatory frameworks.
Obligation
The ECB's introduction of climate factors into its collateral framework requires firms to evaluate climate-related risks and vulnerabilities (transition shocks, emissions exposure, decarbonization plans) in corporate bonds and document the resulting risk assessment and mitigants through the uncertainty-score methodology.
The framework also mandates ongoing monitoring and regular review of climate factors by the ECB's Governing Council to reflect new data and regulatory developments, which constitutes a continuous surveillance element distinct from the point-in-time risk evaluation.
Activity
This update concerns ECB collateral framework adjustments for wholesale corporate bond lending to banks, which falls outside the retail financial services business activities defined in the taxonomy.
While climate-factor scoring involves risk assessment methodology, it applies to institutional wholesale lending collateral management rather than retail credit exposure evaluation as defined in the taxonomy.
Themes
The update concerns prudential risk-control measures (collateral haircuts and valuation adjustments) applied by a central bank to mitigate financial losses from climate-related transition shocks, which relates to safety-and-soundness requirements for regulated institutions.
The climate-factor methodology incorporates disclosure requirements (greenhouse gas emissions, decarbonisation targets, climate disclosures) as inputs to the collateral valuation framework, reflecting a transparency and disclosure element, though this is secondary to the prudential risk-control focus.
Functions
The ECB's collateral framework change directly impacts how banks' treasury and finance functions must value and manage corporate bond collateral used in ECB lending operations, requiring updates to liquidity and funding models.
Risk functions must integrate climate-related financial risk assessment into their enterprise risk framework and collateral valuation oversight, though this is secondary to the immediate treasury impact.
2026-07-08 09:13:34·arahman@vixio.com
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The European Central Bank (ECB) is the central bank of the European Union countries which have adopted the euro. Our main task is to maintain price stability in the euro area and so preserve the purchasing power of the single currency.
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TITLE: European Central Bank Introduces Climate Factors Into Collateral Framework for Corporate Bonds
BODY:
On June 15, 2026, the European Central Bank (ECB) introduced climate factors into its collateral framework to address financial losses linked to climate change. The climate factors ensure that firms' vulnerability to transition shocks are considered when assessing the value of corporate bonds used as collateral in lending to banks.
The ECB lends money to banks to steer short-term interest rates and maintain inflation close to its target. To mitigate financial risks when granting these loans, the ECB requests high-quality collateral and applies risk control measures including "haircuts"—reductions in the value assigned to collateral assets to maintain a safety buffer. Climate change introduces unprecedented and potentially severe economic consequences that may not be reflected in historical price data used to calibrate asset haircuts. Unexpected transition shocks linked to the move towards a low-carbon economy can affect firms' business models, profitability, and asset values. Climate factors further reduce the value the ECB assigns to certain corporate bonds depending on the issuer's exposure to climate-related uncertainties.
The ECB constructs an uncertainty score for each corporate bond using a two-step approach. The score comprises three components: stressor (potential impact of a transition shock on financial asset values by sector); exposure (assessed at firm level using greenhouse gas emissions, decarbonisation targets and climate disclosures); and vulnerability (represented by the square root of the asset's residual maturity). Bonds issued by firms with higher emissions, weaker transition plans or less comprehensive climate disclosures, as well as bonds with longer residual maturities, receive higher uncertainty scores. In the second step, uncertainty scores are transformed into climate factors rescaled to vary within a narrow range set by the ECB's Governing Council. Climate factors represent an additional reduction in collateral value on top of regular valuation haircuts. The ECB's Governing Council will regularly review climate factors to reflect new data, regulatory developments and advances in risk assessment capabilities.
Climate factors: how the ECB tackles climate uncertainty in its collateral framework Skip to: Skip to navigation Skip to content Skip to footer ANYTIME PAST MONTH PAST YEAR Search Options Image Preview Sort by ANYTIME PAST MONTH PAST YEAR Suggestions Home Media Explainers Research & Publications Statistics Monetary Policy The €uro Payments & Markets Careers Suggestions Sort by Relevance Date Dirk Broeders Senior Lead Financial Risk Expert · Risk Management Daniel Gybas Principal Financial Markets Expert · Market Operations, Market Operations Framework THE ECB BLOG Climate factors: how the ECB tackles climate uncertainty in its collateral framework 7 July 2026 By Dirk Broeders and Daniel Gybas The ECB is now addressing potential financial losses linked to climate change in its collateral framework. Its new climate factors ensure that firms’ vulnerability to transition shocks are considered when assessing the value of corporate bonds used as collateral in lending to banks. On 15 June 2026 the ECB introduced climate factors into its collateral framework. This means that uncertainties related to climate change are now an additional consideration in assessing how much banks can borrow when they use corporate bonds as collateral. Climate factors complement existing risk control measures by protecting the ECB’s balance sheet against unexpected climate transition shocks. They will be regularly reviewed to reflect new data, regulatory developments and advances in risk assessment capabilities. Why does the ECB need climate factors? The ECB lends money to banks to steer short-term interest rates. This ultimately helps keep inflation close to our target. To mitigate financial risks when granting these loans, the ECB requests high-quality collateral. But even this collateral can be exposed to risks. And that is why the ECB applies a number of risk control measures to protect itself against financial loss. A prominent feature of the collateral framework are “haircuts”: when deciding how much banks can borrow, the ECB lowers the value it assigns to collateral assets. In this way, it maintains a safety buffer between the market price of an asset and the amount of money a bank can borrow against that asset. Climate change introduces unprecedented, uncertain and potentially severe economic and financial consequences for firms that may not be reflected in the historical price data that is used to calibrate asset haircuts. For example, unexpected transition shocks linked to the move towards a low-carbon economy can affect firms’ business models, profitability, and the value of the assets they hold. Such shocks may occur in reaction to changes in climate policies, technological developments and shifting consumer preferences. As a result of a transition shock, the value of financial assets issued by exposed companies could fall below the post-haircut value hitherto assigned to those assets . That is why climate factors further reduce the value the ECB assigns to certain corporate bonds used as collateral, depending on the issuer’s exposure to climate-related uncertainties. Put simply, if a corporate issuer is more exposed to future climate transition shocks, a bank may be able to borrow less against the same value of bonds. Given the current environment of low borrowing levels and the limited use of corporate bonds as collateral, the immediate effect of climate factors on banks is expected to be limited. Climate factors are designed in two steps Because many of the future effects of climate change are unprecedented, the ECB cannot simply rely on historical data to assess their potential impact. Instead, it carries out a forward-looking scenario analysis, using a two-step approach. In the first step, the ECB constructs an uncertainty score for each corporate bond that banks can use as collateral. This score does not measure climate uncertainty directly. However, it allows assets that are more or less sensitive to climate shocks to be identified. This score is the product of three components: stressor, exposure and vulnerability. The stressor component captures the potential impact of a transition shock on financial asset values for different sectors; for example, a shock would likely have a stronger financial impact on the carbon intensive utility sector than on the software and services sector. Compared with a baseline scenario without such a shock, the stressor measures how asset values decrease at the sector level and can be understood as a common “market factor” applied to all firms in the same sector. Exposure is assessed at firm level, using information on greenhouse gas emissions, decarbonisation targets and the quality of climate-related disclosures. Within the same sector, firms differ in how well they are aligned with the transition to a low-carbon economy. The exposure component therefore measures how sensitive an individual firm is to sector-level shocks. Vulnerability is assessed at asset level and is represented by the square root of the asset’s residual maturity. Longer‑dated securities are treated as more vulnerable to shocks because a larger share of their cash flows is exposed to future transition developments. Together, these three components determine how sensitive a bond is to transition shocks (see Chart 1). Depending on sector-level characteristics, bonds issued by firms with higher emissions, weaker transition plans or less comprehensive climate-related disclosures – as well as bonds with longer residual maturities – receive higher uncertainty scores and are therefore treated as more exposed to transition uncertainty. In the second step, the asset-specific uncertainty score is transformed into a climate factor. Uncertainty scores are absolute numbers that can, in theory, reach very high levels. Because this is not practical for risk management purposes, the climate factors are rescaled to vary in a narrow range which is set by the Governing Council. This step ensures that uncertainty scores are translated into figures that have the same effect as traditional valuation haircuts and lower the assigned collateral value specifically for climate-related uncertainties. As a result, climate factors represent an additional reduction in the collateral value assigned to the asset. This comes on top of the regular valuation haircuts applied under the existing collateral framework. To illustrate how this works, let’s take a simple example: suppose a bond has a market value of €100, a standard valuation haircut of 10% and a climate factor of 0.978. The amount of liquidity the bank can receive for this bond is therefore 100 × (1 − 0.10) × 0.978 = €88, instead of the €90 it would have been able to borrow before the introduction of the climate factor. Chart 1 gives an overview of how climate factors are constructed. Chart 1 Climate factors and their building blocks Source: ECB. Note: The figure shows from bottom to top how climate factors are derived from three layers of input. Climate factors are calibrated to reduce the ECB’s exposure to transition uncertainty while ensuring that banks have enough collateral to participate in monetary policy operations. In the initial design, the reduction in collateral value is capped at a certain maximum for assets that are the most sensitive to unexpected transition shocks. This is based on findings from the ECB’s latest climate stress test. The utility, materials and transportation sectors tend to have low climate factors, reflecting their high transition exposure, capital intensity, regulatory sensitivity and reliance on fossil fuels. A low climate factor reflects high uncertainty and implies a relatively large reduction in collateral value. By contrast, software and consumer services tend to have high climate factors, as this industry is less dependent on fossil fuels and hence less exposed to transitions shocks. At the same time, differences within sectors are substantial, because issuer emissions, transition plans, disclosures and bond maturities can vary widely. Chart 2 shows how uncertainty scores vary across economic sectors and the universe of mobilised bonds issued by non-financial corporations. High uncertainty scores translate into relatively high reductions in the value assigned to collateral. Chart 2 Uncertainty score distribution across GICS sectors Source: ECB. Notes: The figure shows a boxplot of the distribution of uncertainty scores per economic sector using the Global Industry Classification Standard (GICS). Each dot represents one bond. The box represents the middle 50% of the data. The horizontal line inside the box marks the median and the x the mean. The y-axis is capped at 100. Data are for 31 March 2026. Climate factors: an addition to the toolkit for addressing climate-related uncertainties Climate factors are designed to complement the ECB’s existing collateral risk controls. Regular valuation haircuts are well suited to covering financial risks observed in the historical data used to calibrate them. At the same time, they are less able to capture potential climate shocks, as historical data on such shocks are limited. Climate factors therefore add a forward-looking, precautionary overlay to collateral valuations, helping account for climate-related uncertainties that may not be reflected in regular valuation haircuts. Climate factors also differ from the ECB’s regular credit risk assessments. Credit ratings and probabilities of default focus on the likelihood that a bond issuer will fail to meet its obligations. By contrast, climate factors focus instead on how the market value of an asset may change due to climate-related uncertainties. In this sense, they do not double-count the impact of climate transition shocks on default risk but address a different channel through which climate uncertainty can affect collateral value. They therefore add one more instrument to the toolkit for addressing financial risks. As climate risks evolve, so will the newly introduced climate factors. Following their introduction on 15 June, the ECB’s Governing Council will regularly review the climate factors, including their scope and calibration. In this way, we can ensure that we account for the increasing availability of data, relevant regulatory developments and advances in risk assessment capabilities. The views expressed in each blog entry are those of the author(s) and do not necessarily represent the views of the European Central Bank and the Eurosystem. Check out The ECB Blog and subscribe for future posts. For topics relating to banking supervision, why not have a look at The Supervision Blog ? 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