ESG Risk and Compliance
Level 3 — ICAAP Climate Risk Integration · Bank-Level Climate Stress Test Programme

This unit covers the ICAAP Pillar 2 framework as the basis for climate risk capital quantification and the ECB's specific expectations for climate risk ICAAP integration. The ICAAP is the bank's internal process for assessing whether its capital resources are sufficient to cover all material risks over the planning horizon, supplementing the Pillar 1 minimum capital requirements calculated using standardised regulatory formulas. Pillar 2 capital (the Pillar 2 Requirement, or P2R) is set by the supervisor based on the ICAAP assessment and covers risks that Pillar 1 does not capture or captures inadequately. The ECB supervisory expectations (set out in the ECB Guide on climate-related and environmental risks, 2020) require banks to: identify climate risk as a driver of existing risk categories, assess the materiality of climate risk across the portfolio, quantify the potential additional capital requirement, and document the integration in the ICAAP. The unit notes that the ECB has signalled it will increasingly scrutinise the quantitative rigour of climate risk capital assessments in ICAAP reviews and Supervisory Review and Evaluation Process (SREP) discussions.

This unit covers the mapping of the climate risk transmission channels from Module B5 to the ICAAP risk categories, establishing the capital impact pathway for each. Credit risk is the primary category: physical risk affects it through collateral value impairment (LGD channel) and counterparty creditworthiness deterioration (PD channel); transition risk affects it through counterparty revenue decline and operating cost increase (PD channel) and through stranded asset collateral impairment (LGD channel). Market risk is the secondary category: transition risk affects the mark-to-market value of financial investments in carbon-intensive sectors; physical risk affects the value of real estate collateral in the banking and trading books. The operational risk category covers the bank's own exposure to acute physical climate events — extreme weather events can disrupt data centres, branch networks, and payment systems, generating operational losses and business continuity costs. The business and strategic risk category covers longer-term reputational and strategic risk from climate-related loss of business. The mapping establishes the capital quantification responsibility for each risk category covered in subsequent units.

This unit covers the quantification of the additional Pillar 2 credit risk capital requirement attributable to climate risk, using the expected credit loss uplift and credit quality migration estimates from Module 2.1. The credit risk capital quantification methodology applies the scenario analysis results in two steps: first, the expected credit loss uplift (the additional provision required under the climate scenario) is deducted from CET1 capital, reducing the bank's capital ratio directly; second, the credit quality migration (the downward rating migration of climate-exposed counterparties) increases the risk-weighted assets under the standardised or IRB capital approach, requiring additional capital to maintain the target capital ratio. The 2 degrees Celsius scenario is the primary reference scenario for ICAAP capital quantification, reflecting the ECB's expectation that banks use a scenario consistent with the Paris Agreement target. The unit covers the calculation under both the orderly and disorderly 2 degrees Celsius NGFS scenarios, noting that the disorderly scenario implies higher capital requirements due to the more severe short-term economic disruption of delayed policy action, and covers the sensitivity analysis across scenario assumptions and key model assumptions.

This unit covers the market risk and operational risk components of the ICAAP climate risk capital assessment. The market risk component covers the bank's financial investments portfolio: for each holding in carbon-intensive sectors and in climate solution sectors, the unit applies the transition risk repricing from Module 2.1 (the change in market value implied by the transition scenario) to estimate the mark-to-market impact under the climate stress scenario, translated into a Value-at-Risk equivalent for inclusion in the ICAAP market risk section. The operational risk component covers the bank's own operational exposure to acute physical climate events using a methodology that supplements historical operational loss data with scenario analysis of extreme weather event frequency and severity under the Hot House World scenario. The unit also covers the business continuity risk assessment: the proportion of the bank's critical infrastructure in locations with high physical risk scores, and the capital adequacy implications of a major physical disruption event.

This unit guides learners through the preparation of the climate risk section of the ICAAP document, formatted for ECB supervisory review. The ICAAP climate section covers: the risk identification and assessment summary (the climate risk taxonomy from B5, the materiality assessment results, and the mapping to ICAAP risk categories from Unit 3.1.2), the capital quantification methodology and results (the credit risk, market risk, and operational risk capital estimates from Units 3.1.3 and 3.1.4, the aggregation methodology, and the diversification adjustments), the sensitivity analysis (the range of capital estimates across scenario assumptions and model uncertainty), the management actions planned to reduce climate risk capital requirements over time (lending portfolio repositioning, credit underwriting standard enhancement, and collateral risk management improvements), and the board approval record (confirming that the board has reviewed and approved the climate risk ICAAP section). The capstone deliverable is the complete climate risk ICAAP section with supporting annexes covering the calculation methodology and scenario assumptions.

This unit covers the architecture of a bank-level climate stress test programme and the specific requirements of the ECB 2022 climate stress test as the reference methodology. The programme architecture covers five components: scope definition (portfolios, geographies, risk categories, and time horizons included), scenario selection (the three NGFS scenarios with bank-specific adaptations for the relevant country and sector context), model architecture (satellite models that translate NGFS macro variables into counterparty-level financial impacts), data infrastructure (the data sourcing and management process for both internal and external inputs), and reporting infrastructure (templates and processes for supervisory submission outputs). The ECB's methodology document (Supervisory climate stress test: Methodology overview, 2022) is covered in detail as the most comprehensive publicly documented supervisory climate stress test framework, with the unit covering its key innovations relative to earlier exercises: the 30-year horizon (substantially longer than standard prudential stress tests), the three-scenario design, the satellite model requirement, and the sector granularity of the results reporting.

This unit covers the development of the scenario narrative, which translates the NGFS global and regional macroeconomic assumptions into a bank-specific scenario story connecting the global climate pathway to the specific counterparty and collateral exposures in the bank's portfolio. The scenario narrative serves two purposes: it provides the analytical foundation for the satellite model design (which must be consistent with the narrative), and it satisfies the ECB's requirement that banks demonstrate a coherent narrative connection between macro scenario assumptions and micro-level financial impacts. The development covers three steps: global-to-regional translation (using the NGFS Scenario Explorer to extract regional and country-level assumptions most relevant to the bank's portfolio geography), regional-to-sector translation (applying sector-specific impact models from IEA sector analyses and academic research), and sector-to-counterparty translation (developing the bank-specific assumptions about how sector-level impacts translate to the financial performance of specific counterparty types). The unit works through the narrative development for the case bank's three highest-exposure sectors — commercial real estate, oil and gas, and agriculture — under each NGFS scenario.

This unit covers the specification of the satellite models that are the analytical core of the climate stress test. Satellite models are the quantitative tools that translate scenario variables (carbon prices, GDP growth rates, sector demand indices, temperature and precipitation projections) into portfolio-level credit risk metrics (PD migration matrices and LGD adjustment factors) — the term 'satellite' reflecting that these models use the bank's existing credit risk models as their foundation and add climate-specific adjustment factors on top. The satellite model specifications cover three portfolio segments: for the corporate lending portfolio, the model applies sector-specific revenue and cost impact functions to each counterparty's financial data, producing an adjusted EBITDA and DSCR for each scenario year mapped to a PD migration using the existing credit rating model; for the real estate lending portfolio, the model applies physical risk score and scenario projections to a property value discount function, producing an adjusted LGD; for the financial investments portfolio, the model applies the transition risk repricing to the mark-to-market value of each holdings segment. The unit covers the model specification format required for ECB supervisory review.

This unit covers the data requirements for the satellite models, the validation approach for the stress test results, and the sensitivity analysis design. The data requirements cover internal data (borrower financial data including revenue, EBITDA, and debt service from the bank's credit management system; collateral location data from the secured lending register; sector classification from the borrower master data; and current credit ratings from the internal rating model) and external data (NGFS scenario variables from the Scenario Explorer; physical risk scores from WRI Aqueduct and Copernicus; sector-level impact estimates from IEA and academic sources; and benchmark loss data from the ECB's historical credit risk statistics for calibration). The results validation approach covers three components: back-testing (comparing the satellite model's PD migration prediction against the actual loan performance observed in historical climate events such as the 2018 European drought or the 2021 German flood), expert judgment overlay (a structured process for senior credit risk management to review and adjust satellite model outputs where the model has known limitations), and sensitivity analysis (varying key satellite model assumptions to quantify the range of results across plausible model specifications). The unit produces the validation plan document required for ECB supervisory review.

This unit covers the preparation of the supervisory reporting templates and the governance structure required for a climate stress test programme. The supervisory reporting templates cover: the portfolio exposure summary (total exposure by sector, geography, and climate risk tier, formatted to ECB specifications), the scenario assumptions documentation (the bank-specific adaptation of the NGFS scenarios with a clear chain of assumptions from global NGFS variables to bank-specific impact parameters), the satellite model methodology note (full specification of each satellite model covering model design, data inputs, calibration approach, and validation results), the stress test results table (ECL uplift and capital ratio impact by scenario and time horizon, by portfolio segment, with model uncertainty ranges from the sensitivity analysis), and the management actions summary (the strategic and risk management actions the bank has taken or plans to take in response to stress test findings). The programme governance covers the steering committee structure (typically chaired by the CRO with representation from credit risk, market risk, finance, strategy, and sustainability), the model risk management review process applying the bank's model validation standards to the satellite models, the data quality assurance process, and the board review and approval of the final submission. The capstone deliverable for this module and the Track 5 CRDP credential is the complete climate stress test programme design document, covering all five template components and the programme governance framework.