Bank of England Revises Collateral Rules with Climate Risk Measures

The Bank of England (BoE) has announced changes to its collateral eligibility framework. It is now incorporating climate transition risk factors into the valuation methodology for corporate bonds pledged by banks as collateral. This is the first time the central bank has included net zero transition risk, climate risk management, financial stability, corporate bonds, and sustainable finance regulation considerations into its collateral framework.

The revised approach will alter how specific corporate bonds are valued when banks use them to access central bank lending facilities. The BoE explained that the changes reflect the potential financial risks companies may encounter during the transition to a net zero economy. This is especially true for sectors affected by shifts in energy systems, regulation, and market conditions.

New Haircut Adjustments for Climate Transition Exposure

The BoE’s collateral framework specifies which assets banks can pledge when borrowing from the central bank. To manage risk, the institution applies discounts known as “haircuts” to collateral values. These discounts lower the amount banks can borrow against specific assets based on their risk characteristics.

With the updated methodology, the BoE will add extra haircut adjustments for corporate bonds issued by companies in sectors more vulnerable to climate transition risks. These additional reductions will take effect at the end of October 2026 and are meant to consider potential decreases in asset value linked to the economic shift towards net zero.

The central bank noted that issuers may face financial risks from changes in policies, technology, consumer behavior, and investment patterns tied to the transition to a lower-carbon economy.

Thermal Coal Companies Removed from Collateral Eligibility

In addition to the introduction of transition risk adjustments, the BoE confirmed that bonds from companies earning revenue through thermal coal mining will no longer qualify as eligible collateral under its framework.

This decision reflects growing concerns among financial regulators about the long-term risks associated with high-carbon assets. Thermal coal remains one of the most carbon-intensive energy sources, and companies relying on coal revenues may face greater exposure to regulatory changes and market shifts during the global energy transition.

Move Aims to Strengthen Financial Risk Assessment

The BoE’s updated collateral approach is part of broader efforts by central banks to evaluate how climate-related factors could influence financial markets and institutional stability. Although the framework does not represent a direct investment policy, it aims to ensure that risk assessments used in financial operations consider emerging economic challenges.

The central bank emphasized that climate transition risks could affect the future value of corporate assets, particularly for businesses that may need to change operations, cut emissions, or respond to regulatory requirements.

Alignment with Global Central Bank Climate Measures

The BoE’s decision follows similar actions among other major financial institutions. The European Central Bank (ECB) has also announced plans to include climate-related factors in its collateral framework to address risks connected to possible declines in asset values during climate transition shocks.

Central banks are increasingly focusing on climate-related financial risks as part of their broader responsibilities for maintaining financial stability. These measures aim to improve understanding of how environmental changes and policy shifts could impact financial markets and lending systems.

Implementation Timeline and Market Impact

The new collateral rules will take effect at the end of October 2026, allowing banks time to prepare for the updated valuation approach. Financial institutions using corporate bonds as collateral will need to evaluate how the new haircut methodology may influence their borrowing capacity through BoE lending facilities.

The introduction of climate transition factors into collateral assessments marks a significant advancement in how central banks assess financial risks. The BoE’s approach signifies the growing integration of climate-related considerations into financial regulation and risk management frameworks.