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Case study/ B2B platform

Verified CBAM emissions data for producers selling into the EU.

Category
B2B platform
Year
2026
Our role
Product design, Platform engineering, Emissions engine
Tags
Product design · Web platform · Climate tech
Live
tonnemark.com
The challenge

Since 1 January 2026, EU importers pay for the carbon in the steel, aluminium, cement and fertilisers they buy. Without the producer’s own figures they pay on default values, marked up 10% in 2026 and 30% from 2028, so every year without verified data makes a plant outside the EU more expensive to buy from.

The solution

Tonnemark turns a plant’s fuel, power and production records into verified embedded-emissions data, calculated with the EU method per CN code, and shares it with each buyer through a private, revocable link.

What we built/ 6 features

  • Installation mapping

    Processes, production routes and the CN codes a plant sells, mapped with the producer in a single setup call.

  • The EU method, built in

    Gas and power invoices, meter readings and production logs go in; direct and indirect emissions per product come out, with precursors carried through.

  • Ready for verification

    A readiness check that mirrors what an accredited verifier asks on the first site visit, and an evidence pack to hand over.

  • Statements for buyers

    One private link per buyer, scoped to the goods they buy, with view receipts and one-click revoke.

  • Exports that file

    Excel and CSV downloads that follow the EU communication template, ready for the importer’s CBAM declaration.

  • Built for the sectors CBAM covers

    Iron and steel, aluminium, cement and fertilisers, each with its own chargeable emissions and precursors.

In detail/ 7 images
The Tonnemark home page, with hot steel leaving the rolls stamped with its emissions figures
A mark on every tonne, from the furnace to the EU buyer.
A sample embedded emissions statement for a rebar mill, beside the buyer’s bill on default values and on verified data
The statement a buyer files, and what verified data saves them.
Mark-ups on default values rising from 10% in 2026 to 30% in 2028 while the free allocation shrinks
The arithmetic every EU buyer is already doing.
Four steps — map the installation, enter what you already measure, get verified, share with buyers
Four steps from meter readings to a filed number.
Statements shared with three EU importers, and when each last opened theirs
One private link per buyer, with view receipts.
The four CBAM sectors — iron and steel, aluminium, cement and fertilisers — with chargeable emissions and precursors
Built around the goods CBAM actually covers.
Tonnemark on a phone
The same mark, on the phone.
Conyro’s role

  • Product design

    The site, the platform and the buyer statement, designed as one system.

  • Platform engineering

    Workspaces, installation data, verification readiness and per-buyer sharing.

  • Emissions engine

    The EU method for installations, per CN code, with precursors carried through.

The outcome

Tonnemark is live at tonnemark.com for producers of steel, aluminium, cement and fertilisers, with support in English, Bosnian, Croatian and Serbian.

Contact

Have an idea for a business, or want to improve the one you already run? Tell us about it — the first consultation is free.

Studio
85 Great Portland Street, First Floor
London W1W 7LT
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