Three layers made this loan possible, and only one of them is rock. Terradot’s $34 million senior secured term loan from HASI, announced October 27 according to MarketScreener, sits on top of fixed-price multi-year offtake contracts with Frontier Climate’s buyer coalition and a carbon delivery insurance policy from CFC arranged through Marsh. The rock, the farmland, and the science are the asset. The contract and the insurance are what a lender can actually underwrite.

Why the structure matters more than the headline number

Enhanced rock weathering (ERW), the practice of spreading crushed basalt on farmland so it reacts with rainwater and locks CO2 away as dissolved bicarbonate, has until now been funded almost entirely by venture equity and prepaid credit purchases. MarketScreener’s version of the release puts Terradot’s total equity raised at $58 million from investors including Google, Microsoft, Gigascale Capital, Valor Capital, and Acre Venture Partners. Debt is different. Equity investors buy a share of an uncertain future. A senior secured lender wants a predictable cash flow and a claim on specific assets if that cash flow fails. Brasil Inovador frames the deal explicitly as Terradot’s transition from pure venture backing to “traditional capital markets and infrastructure finance instruments,” which is the company’s framing, not an independent assessment. But the framing is the point: if ERW can borrow against contracted tonnes, its cost of capital falls, and that compounds across every future project.

What each source says, and where they differ

The three write-ups agree on the core facts but not on every detail, and the gaps are informative. ESG Today describes the facility as a loan “of up to $34 million.” MarketScreener’s text, which reads as the Business Wire release, and Brasil Inovador both state a flat $34 million. “Up to” usually means a committed facility drawn in tranches against milestones; a flat figure implies the money is already there. The sources do not resolve this, and the difference matters for how much project capital Terradot actually has in hand today. The CFC delivery insurance, brokered by Marsh, appears in MarketScreener and Brasil Inovador but not in ESG Today’s summary. Brasil Inovador goes furthest, describing the policies as covering “operational and delivery risks” and claiming they reduce “regulatory and agronomic uncertainties” in proving removal. Coverage limits, premiums, and what triggers a payout are not disclosed by any source. Brasil Inovador is also the only source to argue that the “investment grade” credit profile of Frontier Climate’s members (Google, Salesforce, JPMorgan, Shopify, Stripe) served as the collateral logic for HASI. That is a plausible reading of a fixed-price offtake, but it is the Brazilian outlet’s interpretation, not a statement from HASI. HASI’s Co-Chief Investment Officer Annmarie Reynolds is quoted in all three sources listing “contracted demand, rigorous field data, a repeatable deployment model, and a thoughtful approach to risk” as the qualities that got the deal done.

HASI is lending outside its usual asset list

MarketScreener’s “About HASI” section describes a $17 billion portfolio across utility-scale solar, storage, onshore wind, distributed solar, renewable natural gas, and energy efficiency. Carbon removal is not on that list. A lender whose book is built on power purchase agreements and metered kilowatt-hours is now treating a multi-year carbon offtake as the functional equivalent. Whether HASI’s credit committee applied solar-style discount rates or something steeper is not disclosed. Frontier Climate’s head, Hannah Bebbington Valori, is quoted by MarketScreener saying the deal “demonstrates how long-term purchases together with capital markets can support carbon removal deployment.” That is Frontier Climate describing its own purchases as debt-enabling, which is a claim it has an interest in making. But it is also the first time a disclosed ERW debt facility has been explicitly tied to those contracts, and all three sources repeat Terradot’s claim that this is the largest disclosed ERW debt financing.

The deployment the loan funds

Terradot plans to spread one million tonnes of crushed rock across 60,000 hectares (150,000 acres) of US and Brazilian farmland during 2026 and 2027, per all three sources. Note the unit: that is tonnes of rock, not tonnes of CO2. None of the sources state how much CO2 removal the deployment is expected to yield, and the conversion depends on rock mineralogy, soil chemistry, and rainfall. The company’s separate target of one million tonnes of CO2 removed per year by 2035 (MarketScreener) is a long-term aspiration, not a figure for this project. On verification, MarketScreener and Brasil Inovador both report that Terradot has issued credits certified by Isometric under its Enhanced Weathering in Agriculture protocol and Puro.earth credits from US operations acquired through its 2026 purchase of competitor Eion. The science team is led by co-founder Scott Fendorf, a Stanford professor, and Brasil Inovador describes a proprietary measurement, reporting, and verification (MRV) model correlating mineral dissolution rates, soil isotopic composition, and drainage dynamics across tropical and temperate soils. That description comes from the company. No source reports an independent audit of delivered tonnes against contracted tonnes.

What the sources do not show

Loan tenor, interest rate, covenants, and what assets secure the facility are undisclosed. The fixed offtake price with Frontier Climate is undisclosed. Insurance terms are undisclosed. Terradot CFO Julia Sekula’s line, “lenders only back what they can predict,” is quoted in all three sources, but the prediction itself, the forecast delivery curve HASI lent against, is not public. So the deal proves that a specialist infrastructure lender was willing to write a check against ERW contracts plus insurance. It does not yet prove that ERW cash flows behave like solar cash flows. That gets tested when Terradot’s 2026-2027 deployments produce verified credits and Frontier Climate pays for them, or when CFC does. The question for the field is whether the next ERW developer can replicate this stack without Terradot’s $58 million equity cushion and four years of field data. Watch for HASI’s SEC filings to see how the loan is classified and provisioned, and watch for the first public delivery report against the Frontier Climate contracts. Those two documents will tell us whether this was a template or a one-off.

Sources

Source: esgtoday.com