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

The Contract Is the Collateral: What Nature Finance Should Borrow from the Renewables Power Purchase Agreement

Only 13 per cent of nature projects use project debt as their main source of funding, yet 85 per cent of those that do hold an offtake. The renewables power purchase agreement shows which contract terms turn an offtake into collateral.

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.

The Parent Balance Sheet Is The Collateral: How Commodity Incumbents Finance Their Carbon Removal Divisions

Exomad Green and Sirius Regenerative turn timber and palm residues into biochar. Lenders price the parent's credit history, not a carbon start-up's promise.

The Warehouse Comes Before The Fund: Reading Impact Earth's Tropical Resilience Fund As A Project-Finance Sequence

Impact Earth's Warehousing Facility funds the first TREF loans before first close. For senior investors, a seeded portfolio is easier to underwrite than a blind pool.

Private Commitments Are Underwriting Evidence: Reading The IDH Cameroon PES Hub As A Project-Finance Structure

Project Finance · Nature Finance · Cameroon · 24 September 2026 Private Commitments Are Underwriting Evidence: Reading The IDH Cameroon PES Hub As A Project-Finance Structure The IDH Cameroon Investment and Payment for Environmental Services Hub disburses USD 24.6M from CAFI in three performance-linked tranches, gated on signed private-company contracts and independent

One Authorisation, Many Reports: Article 6.2 as a Recurring Sovereign Covenant

Project Finance · Article 6.2 · Ghana · 17 September 2026 One Authorisation, Many Reports: Article 6.2 as a Recurring Sovereign Covenant The Letter of Authorisation is a one-time gate at financial close. The corresponding adjustment is a sovereign covenant that repeats every biennial cycle for the full life of the

Investor-Level Guarantees Are Unlocking European DFI Capital Into Global South Nature Funds

The EFSD+ Carbon Sinks facility applies the guarantee at the LP ticket, not the fund vehicle. Six commitments cluster in seven weeks.