Isometric, the world’s leading certifier of carbon removal, has partnered with global insurance intermediary group Howden to make it easier for project developers to bring CORSIA-eligible credits to market.
Isometric received approval from the International Civil Aviation Organization (ICAO) in November 2025 to issue credits under Phase 1 of the Carbon Offsetting and Reduction Scheme for International Aviation (CORSIA), the UN-backed global framework that requires airlines to offset emissions from international flights above 2019 levels. Isometric is currently in the application process for Phase 2.
The partnership involves an open Request for Proposals (RFP), managed by Howden, through which insurers can apply for approval to offer corresponding adjustment (CA) insurance to project developers registered with Isometric. Applications will be assessed against Isometric’s CORSIA Supplier Insurance Policy, which sets out the criteria an insurance policy must meet to be approved.
CA insurance protects project developers against the risk that a host country reverses its authorization of a carbon credit, which would render it ineligible for CORSIA compliance. Developers holding an approved policy can use it in place of a contribution to Isometric’s buffer pool. Approved insurers will be listed on the Isometric Registry, giving developers a straightforward route to compliance.
The RFP is designed to expand the availability of CA insurance for project developers, supporting the growth of high-quality CORSIA-eligible carbon removal supply at a time when airline demand is set to grow significantly. IATA estimates airlines will require around 500 million tonnes of carbon removal annually by 2050 to reach net zero.
Lukas May, Chief Commercial Officer, Isometric, said: “CORSIA represents a significant and growing source of demand for high-quality carbon removal. By partnering with Howden, we’re giving project developers greater flexibility in how they meet our CORSIA requirements and making it easier to bring eligible credits to market.”
Charlie Pool, Head of Carbon Advisory, Howden, said: “The demand for durable carbon removal is expected to increase significantly over the coming decades. Meeting that demand will require not only high-quality projects, but also the financial and risk-management infrastructure that allows those projects to grow. We’re delighted to be partnering with Isometric to help build that foundation.”
Isometric has also published a standardized Letter of Authorization template, giving project developers and host country governments a ready-made, ICAO-aligned document to work from.
- Isometric
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