Here's something that might surprise you: climate transition risk is already affecting how much banks pay to borrow in the repo market. Not in some distant future scenario—right now.
A recent ECB working paper examines transaction-level data from Europe's repo market between 2019 and 2022, linking banks' exposure to carbon-intensive borrowers with their short-term funding costs. The findings reveal a clear pattern that has direct implications for treasury and liquidity management.
The research shows that "banks with higher financed emissions consistently pay higher borrowing rates in the repo market." Specifically, a one standard deviation increase in financed emissions translates into repo rates that are 7–12% higher on average. In absolute terms, this means an increase of 3–5 basis points—which may sound modest until you consider the scale of daily repo transactions.
This is striking because the repo market is considered exceptionally safe. We're talking about short-term, collateralized transactions, yet climate risk is being priced in even here. As the authors note, "the presence of a carbon premium in generally safe and short-term loans is both novel and surprising."
The premium isn't uniform across all transactions. It's more pronounced when collateral is considered riskier (like non-financial corporate bonds versus government securities) and in less-standardized transactions. The effect also varies by maturity—longer-term repos show a stronger relationship with emissions exposure.
What's driving this? The evidence points to two factors working together. First, there's a genuine risk premium: "transition risk raises firms' production costs and puts downward pressure on profits, increasing the risk of default." Banks lending to carbon-intensive firms face higher credit risk, which flows through to their own funding costs.
Second, there's what the researchers call an "inconvenience premium"—dealer banks with climate commitments are effectively charging more to lend to carbon-exposed counterparties. The study finds that "the premium becomes particularly noticeable after dealer banks joined voluntary climate commitments."
If your bank has significant exposure to carbon-intensive sectors, you're likely already paying more for repo funding than your greener peers. And this gap isn't static—the research demonstrates that "a one standard deviation increase in a bank's financed GHG emissions is associated with a rate increase equivalent to approximately 7–12% of [residual] variation" in borrowing costs.
For liquidity management teams, this creates a new dimension of funding cost variability that sits alongside traditional factors like collateral quality and counterparty relationships. It's no longer just about credit ratings and balance sheet strength—your loan portfolio's carbon intensity is becoming a funding cost driver in its own right.
The repo market has always been about pricing risk efficiently. Now, climate transition risk is part of that calculation.
Source: Giuzio, M., Kahraman, B., & Knyphausen, J. (2026). Climate change, bank liquidity and systemic risk. ECB Working Paper Series No. 3168. European Central Bank. [link]
