The Bond That Fines You for Missing Your Climate Targets
- 3 days ago
- 2 min read
In September 2019, Enel sold a $1.5 billion bond with an unusual clause. If the Italian utility missed a renewable capacity target by the end of 2021, it would owe bondholders an extra 25 basis points every year to maturity.
That was the world's first sustainability-linked bond (SLB). The idea came from Alessandro Canta, Enel's Head of Finance and Insurance, who had concluded that green bonds made the company do its work twice. A green bond meant carving out a subset of projects to finance, when the entire corporate strategy was already pointed at decarbonization.
The difference between the two instruments is straightforward. A green bond restricts where the money goes, so proceeds must fund eligible projects such as a wind farm or a grid upgrade. An SLB leaves the proceeds unrestricted and sets performance targets instead, usually on GHG intensity or renewable share. Miss the target and the coupon steps up.
That opened sustainable debt to companies with no qualifying projects to point at. A utility building wind farms has plenty. A cement producer decarbonizing its own kilns has almost none.
Investors responded quickly. SLBs debuted in 2019 and passed $250 billion in cumulative issuance in under four years, a milestone green bonds took roughly a decade to reach.
Issuance has since fallen sharply. Moody's forecasts roughly $25 billion of SLB supply in 2026 against $900 billion across all labeled sustainable bonds, under 3% of the market.
Enel is the clearest test the structure has faced. The company missed its 2023 GHG intensity target, and roughly $11 billion of its bonds stepped up in April 2024. Its documentation would allow it blame the European energy crisis and avoid the penalty, but Canta said publicly that Enel would not do that. The company paid.
The mechanism worked as designed. However, the added interest was still insignificant against Enel's overall financials. That is the central criticism of SLBs. The penalty for missing a target can cost less than meeting the target.
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