Symbiosis sells CFOs on the carbon offtake

The binding constraint on carbon removal has never been demand in the abstract but a CFO signing a ten-year contract for a good that does not yet exist, from a developer that may not deliver, for a purchase no regulation strictly requires. Symbiosis, the buyers coalition that counts Google, Microsoft, Meta, McKinsey, Salesforce, REI and Bain among its members, says its members have signed offtake agreements covering more than 40 million metric tons of nature-based carbon removal over the past three years, and that some of those members had never signed a ten-year offtake before joining.

Forty million tons is the size of a forward market that has been assembled contract by contract, by buyers who had to convince their own finance functions that an invisible good with an unproven supply chain belonged in the budget. Symbiosis's own account of how it got there, published by Trellis, is unusually candid about where the friction sat: not in project design, not in credit quality, but in delivery risk — the possibility that a high-integrity project with rigorous accounting and a serious stakeholder plan still fails to produce tonnes because of implementation delays, financing gaps or regulatory change.

The distinction matters for anyone underwriting this asset class: assessing a credit that has already been delivered is a measurement problem, while assessing whether a credit will be delivered is a credit problem, one that requires looking at project developer financing, track record and pilot implementation — the things a lender would look at. Symbiosis says it examined exactly those factors in diligence with developers Mombak, Living Carbon and Thryve.earth, which makes this coalition a different animal from one that merely aggregates purchases, and the reason its contracts have any chance of being financed at all.

Symbiosis's central argument to CFOs is an analogy: renewable energy buyers once had to commit to future power from a solar or wind facility that did not exist, and the market solved it with power purchase agreements — long-term forward contracts that give early-stage developers price and volume certainty while allocating risk between developer and buyer in a way finance chiefs accept. Corporate buyers have been here before, the coalition notes, and the PPA template is the precedent they should reach for.

The analogy is fair, but it flatters the carbon market in one important respect: a solar farm that gets built produces electrons into a grid with a settled price, a settled offtaker, and a settled meter, while a nature-based removal project produces tonnes into a market where the unit itself is still being defined, the measurement methodology is contested, and the buyers are frequently the only bidders of size. The PPA comparison may persuade a CFO, but it should not be mistaken for evidence that the underlying risk profile is comparable; what it establishes is that the structure, not the asset, is what finance departments can underwrite.

On structure, Symbiosis's description of the contracts is specific: carbon removal offtakes are typically structured pay-as-you-go, so companies pay only for what they receive, and buyers can negotiate further protections, including minimum delivery thresholds paired with replacement credits. Read those two features together and the shape of the deal becomes clear: the buyer has removed the risk of paying for nothing, and the seller has accepted an obligation to make the buyer whole in tonnes if it underdelivers — a performance guarantee written in a commodity with no spot market deep enough to source replacement from cheaply. A developer signing one of these is taking on a delivery covenant, not selling a credit.

This is where the story stops being about corporate sustainability budgets and becomes a transition-finance story, because as this publication has argued, the next wave of transition capital will be allocated to whoever controls the offtake, dispatch and engineering capacity rather than whoever markets a green label. Symbiosis's contracts are that thesis with signatures on them. A developer with a ten-year, price-and-volume-locked offtake from a coalition whose members include Google, Microsoft and Salesforce has an asset that a project finance lender, a blended-finance vehicle or a private credit fund can underwrite, while a developer with the same project and no offtake has a pitch deck.

The last three years of Symbiosis contracting have built that asymmetry, not the tonnage, and it explains why the coalition's diligence posture is so instructive. By screening developer financing and track record at the project stage, the buyers are effectively originating deals on behalf of the capital that will eventually refinance them, behaving less like a purchasing consortium than an underwriting desk that has not yet taken a balance sheet position.

The argument's least comfortable point is this: pay-as-you-go terms with minimum delivery thresholds protect buyers well, but they also transfer working capital risk squarely onto developers, who must finance planting, measurement and verification before they see meaningful revenue — precisely the implementation delays and financing gaps Symbiosis names as delivery risks. The structure that makes a CFO comfortable is the structure that makes a developer's balance sheet fragile, and that tension is not a flaw in the coalition's design; it is the price of getting the first forty million tons contracted and the reason the next phase of this market requires capital that can sit behind a developer rather than in front of a buyer.

Symbiosis's own framing concedes as much. Three years of contracts, seven named members, and a diligence process that reaches down to pilot implementation is an impressive run of deal-making, but it is also a template that only works while the buyers are the scarce side of the trade. The more important question is whether the first wave of projects that signed under these terms reaches delivery, and on what schedule. Every delivery turns a developer into a bankable counterparty; every miss hands the CFOs who were hardest to convince an argument that will be very difficult to answer.

Trellis reported the account.