The short answer: when three things are already in place before the bond is sold. A creditworthy buyer has signed a long-term offtake for the credits the equipment will produce. The credits themselves are durable and registry-verifiable, so “delivered” is a fact a third party can check. And the bond’s structure lets investors keep their principal while staking only their return on delivery. Citi’s $72 million Carbon Removal-Linked Note for Applied Carbon, closed this month, is the worked example — the first outcome bond Citi has tied to verified carbon removals.
The deal, in one pass
Citi issued a $72 million, 3.5-year, principal-protected note whose proceeds finance Applied Carbon’s mobile biochar deployment across Texas farmland. There are no conventional coupons. Investors receive payments linked to the generation, verification, and delivery of carbon removal credits the project produces — if the credits are not issued and delivered, the payments tied to them do not flow.
Applied Carbon’s equipment is the reason the financing has to arrive first. Its mobile pyrolysis units process crop residue directly in the field, converting agricultural waste into biochar in a single pass and applying it to the soil, where the carbon stays stored for hundreds of years. The machines have to be built and deployed before a single credit exists. That ordering — equipment, then credits, then revenue — is the whole problem the note is designed to solve.
Nuveen participated as a primary buyer, citing the note’s relative value, its impact reporting, and the credit backing of the project’s off-taker. Microsoft holds a long-term carbon credit purchase agreement with Applied Carbon, signed in 2022, covering a portion of the project’s credits. Sonia Battikh, Citi’s Global Head of Carbon Offsets Trading, framed the gap the structure fills: “The voluntary carbon market requires new financial structures to bridge the gap between investor capital and the long-term funding needs of carbon removal projects.”
The timing mismatch is the market’s core problem
Carbon removal projects spend money in the opposite order from the one lenders prefer. Conventional debt wants a revenue history; a removal project has a purchase contract and a field. Venture capital will fund the early stage, but it prices for equity upside and exits, not for fleets of field equipment that pay back over years of credit deliveries.
The World Bank named this exact mismatch when it issued its own credit-linked outcome bond for a Vietnam water-purifier project: projects need up-front financing for capital and operating costs, and the carbon credits arrive a year or more later, after verification. Its answer was the same shape as Citi’s — channel capital-market money in at the start, and link what investors earn to credits actually issued. The Citi note applies that development-finance pattern to a commercial removal developer, at commercial scale, with a corporate offtake standing behind the revenue instead of a donor.
How the structure re-slices the risk
Principal protection removes the risk institutional fixed income cannot hold. A pension-grade buyer cannot put client principal on whether a Texas biochar fleet hits its production plan. Protecting the principal takes that question off the table. What remains at risk is the return — and the return is allowed to depend on delivery, because that is the part the buyer is being paid to underwrite.
Delivery-linked payments keep the outcome incentive inside the security. In a conventional bond, the issuer owes the coupon whether or not anything is removed from the atmosphere. Here the payments exist only when verified credits are generated and delivered. The investor’s upside and the project’s environmental output are the same event, which is what “outcome bond” means when the label is earned.
The anchor offtake turns a delivered credit into a receivable. A verified credit with no buyer is inventory. A verified credit under a long-term purchase agreement with Microsoft is contracted revenue. The offtake is what lets a structurer model the cash flows, what lets Nuveen describe the note as credit-backed, and what separates this financing from a bet on future spot prices in the voluntary market.
What the offtake does — and what it does not do
The Microsoft agreement was signed in 2022, four years before this note. The bond did not create that demand; it borrowed against its credibility. That sequence matters for anyone hoping to copy the structure: the financing was possible because the revenue anchor predated it, not the other way around.
The limits deserve equal weight. The offtake covers a portion of the project’s credits, not all of them. The full credit volume, the delivery schedule, the price per credit, and the note’s exact return formula have not been disclosed publicly. An anchor offtake makes a project financeable; it does not, by itself, underwrite every tonne the equipment could produce, and no reader of this deal’s public record can verify the coverage ratio.
There is a second question the headline number cannot answer. In the World Bank’s $100 million plastic waste outcome bond — a deal Citi itself lead-managed — about $14 million of the headline was the up-front financing the projects actually received. Outcome-bond headlines describe the note, not the project capital. How much of this note’s $72 million reaches Applied Carbon as deployment capital, and on what schedule, is not in the public record either. It is the first question a diligence process should ask of any deal built this way.
When this shape works
The credits are durable and verifiable. The structure prices delivery, so delivery has to be measurable by an independent registry on a schedule the note’s term can contain. Biochar’s multi-century storage and established verification pathways fit; a credit class with contested permanence would not.
A creditworthy anchor buyer signed before the financing. The offtake is the revenue story the structurer sells to the bond buyer. Without it, there is nothing to link payments to except hope and spot prices.
Equipment is the bottleneck, not demand. This shape funds machines that produce contracted output. It does not fix a project whose problem is finding buyers.
The developer can survive the verification lag. Payments follow issued credits, and issuance trails production. A developer without the balance sheet — or the structurer’s up-front allocation — to bridge that gap will stall between making biochar and getting paid for it.
Applied Carbon’s founder and CEO, Jason Aramburu, described the ambition plainly: projects like his “can be structured and financed like any other asset.” This note is evidence for a narrower and more useful claim. A removal project can be financed like an asset when a named buyer has already agreed to purchase its output, the output can be verified by someone other than the seller, and the financing is honest about which risks sit with the principal and which sit with the return. Where any one of those three is missing, the outcome bond is not a shortcut. It is a label.
Deal coverage: ESG News, ESG Post, Carbon Herald, and CarbonCredits.com, October 2026 — terms consistent across all four. Outcome-bond precedent: World Bank outcome bond program materials, including its Emission Reduction-Linked Bond and Plastic Waste Reduction-Linked Bond documentation. Undisclosed items are noted in the text where they occur.