Why Banks Need Climate Risk Assessment
Climate risk has become a financial risk. Regulators from the European Central Bank to the U.S. Office of the Comptroller of the Currency now expect banks to identify, measure, and manage their exposure to climate-related hazards across their lending portfolios.
The challenge is straightforward: banks hold assets—loans, mortgages, commercial real estate—that are physically located somewhere. Those locations face climate hazards. A commercial property in a flood zone, a manufacturing facility in a drought-prone region, an agricultural borrower facing intensifying heat stress—all represent climate exposure on a bank’s balance sheet.
Yet only 20% of banks currently use climate scenario analysis, and just 18% have integrated climate risk into their core risk management processes. The gap between regulatory expectations and current practice is significant.
Physical and Transition Risks for Banks
Banks face two categories of climate risk:
Physical Risks
Physical climate risks arise from the direct impacts of climate change—floods, wildfires, extreme heat, sea level rise, and water stress. For banks, these risks affect collateral values, borrower creditworthiness, and loan performance.
A mortgage on a coastal property exposed to rising seas carries different risk than one in a stable inland location. Physical risk assessment quantifies this exposure across the portfolio.
Transition Risks
Transition risks emerge from the shift to a low-carbon economy. Policy changes, carbon pricing, technology disruption, and shifting consumer preferences can affect borrower revenues and asset values—particularly in carbon-intensive sectors like energy, transportation, and manufacturing.
Banks with concentrated exposure to fossil fuel industries or carbon-intensive supply chains face material transition risk that regulatory stress tests increasingly require them to measure.
Regulatory Requirements for Bank Climate Risk Assessment
Bank supervisors worldwide have moved beyond guidance into enforceable expectations. Three regulatory frameworks now shape how banks approach climate risk assessment:
ECB Supervisory Expectations
The European Central Bank’s Guide on climate-related and environmental risks (November 2020) sets out 13 supervisory expectations covering business strategy, governance, risk appetite, risk management, and disclosure. The ECB treats climate risk not as a standalone category but as a driver of existing prudential risks—credit risk, operational risk, market risk, and liquidity risk.
Banks under ECB supervision were given staggered deadlines to meet these expectations, with full alignment required by the end of 2024. The ECB has since conducted thematic reviews and issued institution-specific findings where banks fell short.
Enforcement has followed. In November 2025, the ECB issued its first-ever climate risk fine, penalizing Spanish bank ABANCA EUR 187,650 for failing to complete a materiality assessment of its climate-related risks. In February 2026, the ECB imposed periodic penalty payments of EUR 7,551,050 on Credit Agricole for 75 days of non-compliance on the same requirement. Both penalties were structured as daily fines that accumulate during the period of non-compliance, not one-time charges. The signal to the industry is clear: the ECB treats climate risk management deadlines as enforceable obligations, not aspirational targets.
Basel Committee Principles
The Basel Committee’s 18 principles (June 2022) provide the global baseline. Principles 1 through 12 address banks directly. Principles 13 through 18 guide supervisors on oversight and enforcement. While not legally binding, these principles shape national regulation and supervisory practice worldwide.
| Domain | Principles | What They Require |
|---|---|---|
| Corporate Governance | 1-3 | Board oversight, clear climate responsibilities, organization-wide policies and controls |
| Internal Controls | 4 | Three lines of defence: climate in client onboarding (1st), independent risk assessment (2nd), internal audit review (3rd) |
| Capital and Liquidity | 5 | Incorporate material climate risks into ICAAP/ILAAP and stress testing programmes |
| Risk Management | 6-11 | Integrate climate into credit risk (P8), market risk (P9), liquidity risk (P10), operational risk (P11), with monitoring and reporting (P7) |
| Scenario Analysis | 12 | Assess resilience under plausible climate pathways; consider physical and transition risks across relevant time horizons |
Principle 8 (credit risk) is the most directly relevant for lending portfolios. It requires banks to understand how physical risk drivers affect borrower creditworthiness and collateral values, and to ensure credit risk management systems account for material climate-related financial risks. For banks aligned with IFRS S2, the Basel principles reinforce the same physical risk identification and scenario analysis requirements.
U.S. Regulatory Landscape
The OCC, Federal Reserve, and FDIC jointly issued principles for climate-related financial risk management in October 2023, targeting banks with over $100 billion in assets. The guidance covers governance, strategic planning, risk management, and data practices. While less prescriptive than European frameworks, it signals clear supervisory expectations for large U.S. banks.
| Authority | Scope | Key Requirement | Status |
|---|---|---|---|
| ECB | Eurozone banks | 13 supervisory expectations, climate in risk frameworks | Enforcing — fines issued (ABANCA EUR 188K, Credit Agricole EUR 7.6M) |
| Basel Committee | Global banks | 18 principles for climate risk management + supervision | Active (adopted June 2022) |
| Bank of England | UK banks and insurers | SS3/19 supervisory statement, CBES scenario analysis | Active (CBES completed 2022) |
| U.S. OCC/Fed/FDIC | U.S. banks >$100B assets | Principles for climate financial risk management | Active (issued Oct 2023) |
Non-compliance carries real consequences. Beyond supervisory findings and remediation orders, banks that lag on climate risk management face reputational damage and competitive disadvantage as investors and counterparties demand transparency.
Climate Stress Testing for Banks
Regulators are supplementing written requirements with hands-on stress testing exercises that force banks to model NGFS scenarios across their portfolios.
The ECB’s 2022 climate risk stress test covered 41 directly supervised banks. The results were sobering: projected credit and market losses reached approximately EUR 70 billion across physical risk and disorderly transition scenarios. Around 60% of participating banks lacked a well-integrated climate risk framework, and roughly two-thirds of banks’ income from corporate customers came from greenhouse gas-intensive industries—revealing concentrated transition exposure.
The Bank of England’s Climate Biennial Exploratory Scenario (CBES), completed in 2022, tested the UK’s largest banks and insurers against three pathways: early action, late action, and no additional action on emissions. The results showed climate risks could drag annual profits by 10 to 15%, with costs lowest under early, well-managed transition scenarios.
In the U.S., the Federal Reserve’s pilot climate scenario analysis (2023) engaged six of the largest banks—Bank of America, Citigroup, Goldman Sachs, JPMorgan Chase, Morgan Stanley, and Wells Fargo. Framed as a learning exercise rather than a capital adequacy test, the pilot highlighted significant data gaps and modeling challenges across participants.
Since these initial exercises, the regulatory trajectory has accelerated. The ECB integrated climate risk into its 2025 EU-wide stress test, marking the first time climate scenarios were embedded in the standard EBA exercise rather than run as a standalone pilot. Prudential transition planning requirements take effect in 2026, with the ECB beginning informal dialogues with banks on their progress. The European Supervisory Authorities (EBA, EIOPA, and ESMA) have jointly issued draft guidelines on ESG stress testing, aiming to harmonize methodologies across banking, insurance, and securities sectors. Climate stress testing is moving from standalone learning exercises to embedded supervisory practice.
The pattern across all three exercises and the subsequent regulatory developments is consistent: banks need better data, stronger modeling capabilities, and faster integration of climate factors into existing risk processes. Portfolio-level physical risk screening is a practical starting point that addresses the data foundation regulators expect.
How Banks Assess Climate Risk
A practical climate risk assessment framework for banks follows five steps:
1. Portfolio Mapping
Identify and geocode all physical assets underlying the loan book—commercial real estate, facilities, agricultural land, infrastructure. Accurate location data is the foundation of physical risk assessment.
2. Hazard Screening
Evaluate each location against relevant climate hazards: flooding, heat stress, drought, wildfire, sea level rise, and water stress. Automated tools can screen thousands of locations against climate datasets in minutes.
3. Scenario Analysis
Assess exposure under multiple climate scenarios—typically a moderate pathway (SSP2-4.5) and a high-emissions pathway (SSP5-8.5). This reveals which assets are most sensitive to different climate futures.
4. Exposure Quantification
Translate physical hazard exposure into financial metrics: expected losses, collateral value adjustments, and borrower credit risk scores. Some banks create standalone climate risk scores; others integrate climate into existing credit rating processes. For flood-exposed collateral, HAZUS and JRC depth-damage curves translate flood depth at a property into structural and contents loss estimates — banks can model these at the building level with a flood damage calculator.
5. Reporting and Disclosure
Document findings in formats aligned with TCFD recommendations: governance, strategy, risk management, and metrics. Climate risk management frameworks provide structure for ongoing monitoring and reporting.
Implementation Challenges
Banks face practical hurdles in implementing climate risk assessment. The challenges go beyond resource constraints into fundamental data architecture and methodology questions.
Data fragmentation. Climate risk assessment requires three categories of data: hazard data (projections of flood depth, heat stress, drought severity at specific locations), exposure data (geocoded collateral and borrower locations at the building level), and damage functions (models that translate hazard intensity into financial loss). Most banks purchase these from different vendors, and different teams within the same institution often use different datasets. The result is fragmented risk views where definitions of “medium risk” vary across reports, and scope 3 estimates from one source contradict another.
Portfolio-level analytics mask real risk. A common industry critique of early climate risk efforts is that portfolio-level averages obscure the concentrations that matter. Assessing climate risk across an entire loan book produces a single number that hides the difference between a flood-prone coastal portfolio and an inland portfolio with minimal exposure. Asset-level data, geocoded down to the collateral address, is where credit decisions and regulatory compliance converge. Regulators are increasingly explicit about this: the ECB Good Practices document specifically calls for collateral geolocation at the loan level.
Model validation gaps. Climate models project hazards that have not yet occurred at their projected severity. Banks cannot back-test a 2050 flood projection against observed data. Sensitivity testing (how do results change under different assumptions?), cross-model benchmarking, and regional validation are replacing traditional back-testing as the standard for model assurance. Regulators expect documentation of model limitations and uncertainty ranges rather than false precision.
Time horizon mismatch. Climate risks materialize over decades, while traditional credit risk timeframes operate in 1-5 year windows. Bridging this gap requires scenario analysis across multiple time horizons, which most existing risk systems were not designed to handle.
Resource constraints. Building in-house climate modeling capability requires specialized expertise in climate science, geospatial analysis, and financial risk modeling. Many banks partner with specialized climate data providers rather than building capabilities internally.
These challenges explain why many banks partner with specialized climate data providers rather than building capabilities internally. For portfolio-scale assessment, API-based solutions enable integration into existing credit workflows without requiring climate science expertise.
Frequently Asked Questions
What climate risks do banks face?
Banks face physical risks from climate hazards (floods, heat, drought) affecting collateral and borrower operations, and transition risks from policy changes, carbon pricing, and technology shifts affecting carbon-intensive sectors in their lending portfolios.
Is climate risk assessment mandatory for banks?
Regulatory expectations vary by jurisdiction. The ECB requires Eurozone banks to meet 13 supervisory expectations by end of 2024. The Basel Committee issued 18 principles in 2022. U.S. regulators published climate risk management principles for banks over $100 billion in assets. TCFD-aligned disclosure is increasingly expected or mandated for publicly traded financial institutions.
How do banks integrate climate risk into credit decisions?
Banks can create standalone climate risk scores for borrowers, integrate climate factors into existing credit rating models, apply climate-adjusted collateral valuations, or use climate screening as a supplementary risk flag during underwriting.
What data is needed for bank climate risk assessment?
Essential data includes geocoded borrower and collateral locations, climate hazard projections (physical risk), sector-level transition risk indicators, and scenario parameters (temperature pathways, policy assumptions). Many banks source this from specialized climate data providers.
How long does portfolio-level climate risk assessment take?
Traditional consulting approaches take weeks to months. Automated platforms can screen thousands of locations for climate risk in hours, enabling banks to integrate climate assessment into regular portfolio monitoring rather than treating it as a one-time exercise.
What are the ECB climate risk requirements for banks?
The ECB’s Guide on climate-related and environmental risks sets out 13 supervisory expectations covering business strategy, governance, risk appetite, risk management, and disclosure. Eurozone banks were required to achieve full alignment by end of 2024. The ECB treats climate risk as a driver of existing prudential risks including credit, operational, market, and liquidity risk.
What is climate stress testing for banks?
Climate stress testing requires banks to model the financial impact of climate scenarios on their portfolios. The ECB’s 2022 test covered 41 banks and projected EUR 70 billion in losses. The Bank of England’s CBES found a 10-15% drag on annual profits. The U.S. Federal Reserve conducted a pilot exercise with six major banks in 2023. These exercises assess preparedness rather than setting capital requirements.
Has any bank been fined for climate risk non-compliance?
Yes. The ECB issued its first climate risk fine in November 2025, penalizing ABANCA EUR 187,650 for failing to complete a materiality assessment. In February 2026, the ECB fined Credit Agricole EUR 7.55 million for 75 days of non-compliance on the same requirement. Both were periodic penalty payments rather than one-time fines, signaling that the ECB treats climate risk deadlines as enforceable obligations.
Getting Started
For banks beginning their climate risk journey, the path forward is clear: start with physical risk assessment of the existing portfolio. Geocode collateral locations, screen for hazard exposure, and identify concentrations of climate-vulnerable assets.
This baseline assessment provides the foundation for regulatory discussions, board reporting, and integration into credit processes. Continuuiti’s Climate Risk tool enables banks to screen locations across 12 physical hazards, multiple scenarios, and time horizons—delivering portfolio-level visibility without requiring in-house climate modeling expertise.
