Calculus Carbon partners with institutions in market-making for Nature-Based Solutions, carbon finance, and Natural Capital projects across London, Singapore, and Bangalore.

Venture Debt Before Project Finance: What Terraton's HSBC Loan Is Paying For

Terraton borrowed USD 1.5M from HSBC Ventures after its first credits were issued in Kenya. Read with JPMorgan's USD 20M facility for Charm Industrial, the loan points to venture debt paying for the delivery record, buyer commitments and ticket size a project lender checks.

One Route in CDR Project Finance: Build the Biochar Plant Inside the Feedstock Business, With Carbon Credits on Top

Robinson Carbon, the carbon arm of a 133-year-old Louisiana lumber company, will invest USD 16.3M in a biochar plant at England Airpark. The structure places the plant inside an existing feedstock business, with product sales and state incentives ahead of carbon credits.

Two Offtake Books, One Loan: How Terradot Reached an Institutional Debt Ticket

Terradot's purchase of Eion's assets put two Frontier offtakes, 168,707 tonnes and USD 59.9M, under one owner. Eight months later HASI lent USD 34M against Frontier-backed projects. The case shows how combining contract books can lift a developer into institutional ticket sizes.

Placer County's USD 6M Biochar Loan: Construction Debt Drawn Against Paid Invoices, With the Parent Standing Behind It

Placer County approved a USD 6M, 60-month loan at 10% for a biochar plant near Lake Tahoe. The draw mechanics, the overrun undertaking and the reach of the collateral show how a lender can fund a single site while carrying limited completion risk.

From a Guarantor to a Cocoa Buyer: How Belterra's Second BNDES Loan Was Built Around a Contracted Crop

Belterra's first BNDES loan needed a guarantee mechanism funded by Fundo Vale. Its second, 2.5 times larger, arrives with a 15-year cocoa purchase contract. The case shows how a contracted commodity can carry nature-based project debt, with carbon as upside.

Citi's USD 72M Outcome Bond for Applied Carbon: A Fixed Coupon Exchanged for Delivery-Linked Returns

Citi's USD 72M principal-protected note for Applied Carbon applies the World Bank outcome-bond model to a single commercial project. The structure is replicable where three conditions hold: protected principal, a creditworthy offtaker and an established arranger.

Contracted Is Not Delivered: How Delivery Insurance Changes What A Lender Will Lend Against A Carbon Removal Offtake

Contracted tonnes and delivered tonnes are separate numbers, and a lender sizes debt on the second. Two September 2026 financings show how delivery insurance narrows the gap.

A Financing Line, Not A Residual: Where Community Benefit Sits In A Nature Project's Debt Model

The Africa Nature Impact Fund will back only projects that send a substantial share of gross carbon value to host communities. For a lender, that share is a financing line, not a residual.

The Crowd Writes The First Cheque: How Retail Capital In Nature Projects Shapes What A Lender Asks For Later

French developers are raising early nature project capital from hundreds of retail investors. The first cheque carries the risk a lender will not, but who writes it shapes what the lender asks for later.

Counted, Not Contracted: Reading The OECD's Biodiversity Finance Estimate As A Lender

The OECD's new estimate of global biodiversity finance counts spending and investment. A project lender needs something narrower: contracted, dated receipts. The contract, not the market total, is the repayment source.

The Small Cheque Before The Loan: How Carbon Removal Pre-Purchases Build The Path To Project Finance

Small upfront pre-purchases fund the first verified tonnes of carbon removal. That delivery record is what later offtake buyers and lenders price.

A Fund Target Is Not A Project Loan: Reading Mombak's Amazon Raise As A Capital Stack

Mombak's USD 150M fund target, Salesforce offtake and 25-year BNDES loan are three layers of one capital stack, not one headline.