Carbon credits

A modelled tonne is not a credit. Every step below takes something away.

This page exists to subtract. It starts with the carbon in the char, then removes kiln emissions, adds back the drying heat the kiln displaces, removes the batches that will fail characterisation, removes the registry buffer, and removes the tonnes retired rather than sold. What is left is the only number a buyer could ever purchase. Four of the six impact levers on this platform are deliberately marked not eligible, and the reason is stated on each one.

The biochar joint venture Scope 1, 2 and 3 evidence Partner carbon rights

1,103 t

Issuable removal a year, after every deduction

Estimated

827 t

Sellable after programme retirements

Estimated

0 t

Credits actually issued to date

Verified

Eligibility

Six levers. Two are credit eligible and four are not.

The four refusals are the point of this table. Reclaimed panels, bio-composite substitution, free charging and biogenic carbon in the fibre are all real benefits that sit inside our own product footprint, which is exactly why they cannot also be sold to somebody else.

Biochar from decortication fines

Credit eligible: Eligible
How it is reported: Durable carbon removal, verified per batch, serialised on a public registry
Why: Residue with no alternative use, converted to a stable solid with a measurable permanence marker, and a counterfactual of open burning. This is the only line here that a methodology will accept.

Recovered kiln heat displacing an LPG dryer

Credit eligible: Eligible
How it is reported: Netted inside the biochar removal calculation, never sold separately
Why: It is a genuine avoided emission at origin, but selling it as its own credit while also crediting the char that produced the heat would be the same tonne twice.

Reclaimed panels kept out of the waste stream

Credit eligible: Not eligible
How it is reported: Reported as an avoided-manufacture figure in our own footprint
Why: The avoidance belongs to whoever would have bought a new panel, and no methodology issues against reuse of a component inside your own product.

Bio-composite replacing virgin polymer

Credit eligible: Not eligible
How it is reported: Material substitution inside the cradle-to-gate footprint
Why: This is a lower footprint, not a removal. Counting it as a credit and also as a lower product footprint is double counting by definition.

Free solar charging displacing mains charging

Credit eligible: Not eligible
How it is reported: Grid relief reporting, in kWh and kg avoided
Why: Tiny per session, hard to attribute, and the grid operator already counts the same electron. It is a good story and a bad credit.

Biogenic carbon in the fibre itself

Credit eligible: Not eligible
How it is reported: Reported separately, never netted against fossil emissions
Why: The crop would have grown anyway. Treating standing biomass as a removal is the most common inflation in this sector.

Lever	Credit eligible	How it is reported	Why
Biochar from decortication fines	Eligible	Durable carbon removal, verified per batch, serialised on a public registry	Residue with no alternative use, converted to a stable solid with a measurable permanence marker, and a counterfactual of open burning. This is the only line here that a methodology will accept.
Recovered kiln heat displacing an LPG dryer	Eligible	Netted inside the biochar removal calculation, never sold separately	It is a genuine avoided emission at origin, but selling it as its own credit while also crediting the char that produced the heat would be the same tonne twice.
Reclaimed panels kept out of the waste stream	Not eligible	Reported as an avoided-manufacture figure in our own footprint	The avoidance belongs to whoever would have bought a new panel, and no methodology issues against reuse of a component inside your own product.
Bio-composite replacing virgin polymer	Not eligible	Material substitution inside the cradle-to-gate footprint	This is a lower footprint, not a removal. Counting it as a credit and also as a lower product footprint is double counting by definition.
Free solar charging displacing mains charging	Not eligible	Grid relief reporting, in kWh and kg avoided	Tiny per session, hard to attribute, and the grid operator already counts the same electron. It is a good story and a bad credit.
Biogenic carbon in the fibre itself	Not eligible	Reported separately, never netted against fossil emissions	The crop would have grown anyway. Treating standing biomass as a removal is the most common inflation in this sector.

Conversion

From carbon in the char to a tonne somebody could buy.

Inputs

Residue to the kiln

2,600 t/yr

Permanence claimed

75 per cent

Batches passing characterisation

82 per cent

Registry buffer withheld

20 per cent

Retired rather than sold

25 per cent

Credit price

£118/t

Verification and registry cost

£26/t

Fleet the removal is compared against

1,200 benches

Gross removal

Estimated

1,673 t

Carbon in the char at the claimed permanence

Issuable

Estimated

1,103 t

After failures and the buffer pool

Retired by the programme

Estimated

276 t

Cancelled, not sold

Sellable

Estimated

827 t

The only tonnes a buyer could purchase

Credit revenue

Estimated

£97,577

£118 per tonne on sellable volume

Verification cost

Estimated

£28,667

Paid on every issued tonne, sold or retired

Net after MRV

Estimated

£68,911

£92 per tonne margin

Removal against fleet footprint

Estimated

223%

494 t for 1,200 benches. Reported, never netted.

1.Carbon in the char, at the claimed permanence

1,673t CO2

Starting point

30 per cent char yield, 78 per cent carbon, 75 per cent held durable over a century.

2.Less kiln and handling emissions

1,564t CO2

Removes 109 t

42 kg CO2e per tonne of feedstock, covering handling, start-up fuel and haulage inside the yard.

3.Plus recovered drying heat that displaces LPG

1,681t CO2

Adds 117 t

210 kWh per tonne recovered into the drying floor at 0.214 kg CO2e per kWh avoided.

4.Less batches that fail characterisation

1,378t CO2

Removes 303 t

82 per cent of batches expected to meet the hydrogen to organic carbon threshold. A failed batch is still soil amendment, but it is not a credit.

5.Less the registry buffer pool

1,103t CO2

Removes 276 t

20 per cent withheld against reversal and measurement risk. Withheld tonnes are real removals we do not get to sell.

6.Retired by the programme rather than sold

827t CO2

Removes 276 t

25 per cent retired and cancelled, published as a serial range, and not claimed as neutrality for any bench.

Estimated

Retirements

Who is allowed to claim a retired tonne, and what nobody may claim.

Grower community retirement

Share of issuance: 50%
Beneficiary: The cooperative that produced the feedstock
Claim allowed: The community may state that a stated tonnage of durable removal was produced and retired in their name, with the serial range published.
Claim refused: We do not restate their retirement as our own reduction anywhere on this platform.

Buyer retirement on instruction

Share of issuance: 35%
Beneficiary: A fleet buyer who asks for it in writing
Claim allowed: The buyer retires a serial range against their own Scope 3 reporting, exactly as any other purchased removal.
Claim refused: We do not retire on a buyer's behalf without written instruction, and we do not bundle removals into a bench price by default.

Programme transparency retirement

Share of issuance: 15%
Beneficiary: Nobody, deliberately
Claim allowed: Cancelled with no beneficiary, published so the ratio to the fleet footprint can be seen without the tonnes being spent by anyone.
Claim refused: This is not a neutrality claim and it does not appear net of anything in a headline figure.

Retirement	Share of issuance	Beneficiary	Claim allowed	Claim refused
Grower community retirement	50%	The cooperative that produced the feedstock	The community may state that a stated tonnage of durable removal was produced and retired in their name, with the serial range published.	We do not restate their retirement as our own reduction anywhere on this platform.
Buyer retirement on instruction	35%	A fleet buyer who asks for it in writing	The buyer retires a serial range against their own Scope 3 reporting, exactly as any other purchased removal.	We do not retire on a buyer's behalf without written instruction, and we do not bundle removals into a bench price by default.
Programme transparency retirement	15%	Nobody, deliberately	Cancelled with no beneficiary, published so the ratio to the fleet footprint can be seen without the tonnes being spent by anyone.	This is not a neutrality claim and it does not appear net of anything in a headline figure.

Registry ledger

Pre-kiln model

Event: Modelled
Tonnes: None
Serials: None issued
Status: Not yet
Note: The figure above the ledger is a model output from feedstock, char yield and permanence. It carries no vintage and no serial because no batch has been produced.

First kiln year

Event: Issued
Tonnes: None
Serials: None issued
Status: Planned
Note: Issuance requires a commissioned kiln, batch sheets, laboratory certificates and a registry account with the JV split written in. None of those exist today.

First kiln year

Event: Retired
Tonnes: None
Serials: None issued
Status: Planned
Note: Retirements will be published here as serial ranges with the beneficiary named, including the transparency retirement that names nobody.

Vintage	Event	Tonnes	Serials	Status	Note
Pre-kiln model	Modelled	None	None issued	Not yet	The figure above the ledger is a model output from feedstock, char yield and permanence. It carries no vintage and no serial because no batch has been produced.
First kiln year	Issued	None	None issued	Planned	Issuance requires a commissioned kiln, batch sheets, laboratory certificates and a registry account with the JV split written in. None of those exist today.
First kiln year	Retired	None	None issued	Planned	Retirements will be published here as serial ranges with the beneficiary named, including the transparency retirement that names nobody.

The ledger is empty of issued volume deliberately. When the first batch is characterised, this table carries serial ranges rather than model outputs, and the model above stays where it is so the two can be compared.

Assumptions and basis

Every number above, with where it came from.

Char yield of 30 per cent of dry feedstock mass

Basis: Mid range for continuous retort pyrolysis of dry, screened woody residue at 450 to 600 degrees. A batch kiln on damp feed would sit below this.
Level: Estimated

Permanence fraction of 75 per cent over a century

Basis: Conservative against the range implied by hydrogen to organic carbon ratios below 0.7 in the certification guidance. The slider on this page shows what a stricter or looser fraction does.
Level: Estimated

Batch pass rate of 82 per cent

Basis: Our own allowance for early operating variability on a first kiln. No batch has been produced, so this number has no evidence behind it at all yet.
Level: Estimated

Buffer pool of 20 per cent

Basis: Typical registry withholding for durable removal projects against reversal and measurement risk. The exact figure is set by the methodology chosen, not by us.
Level: Estimated

Credit price of 118 pounds per tonne

Basis: Mid market for verified biochar removal in recent public transactions. Durable removal prices are volatile and a real forward sale would be priced individually.
Level: Estimated

MRV cost of 26 pounds per tonne

Basis: Laboratory analysis, verification and registry fees spread across a small first-year volume. It falls materially with tonnage, which is the main reason a single larger yard beats several small kilns.
Level: Estimated

Bench cradle-to-gate footprint of 412 kg CO2e

Basis: Our own modelled bill of materials, uncommissioned LCA. It is used here only to express a ratio, never to net removals against product emissions.
Level: Estimated

Assumption	Basis	Level
Char yield of 30 per cent of dry feedstock mass	Mid range for continuous retort pyrolysis of dry, screened woody residue at 450 to 600 degrees. A batch kiln on damp feed would sit below this.	Estimated
Permanence fraction of 75 per cent over a century	Conservative against the range implied by hydrogen to organic carbon ratios below 0.7 in the certification guidance. The slider on this page shows what a stricter or looser fraction does.	Estimated
Batch pass rate of 82 per cent	Our own allowance for early operating variability on a first kiln. No batch has been produced, so this number has no evidence behind it at all yet.	Estimated
Buffer pool of 20 per cent	Typical registry withholding for durable removal projects against reversal and measurement risk. The exact figure is set by the methodology chosen, not by us.	Estimated
Credit price of 118 pounds per tonne	Mid market for verified biochar removal in recent public transactions. Durable removal prices are volatile and a real forward sale would be priced individually.	Estimated
MRV cost of 26 pounds per tonne	Laboratory analysis, verification and registry fees spread across a small first-year volume. It falls materially with tonnage, which is the main reason a single larger yard beats several small kilns.	Estimated
Bench cradle-to-gate footprint of 412 kg CO2e	Our own modelled bill of materials, uncommissioned LCA. It is used here only to express a ratio, never to net removals against product emissions.	Estimated

No credit exists. Every tonne on this page is a model output, and the ledger below is empty of issued volume on purpose rather than by omission.

Nothing on this platform is described as carbon neutral, offset or net zero. The ratio of removal to fleet footprint is published so it can be judged, not so it can be spent.

A tonne sold is not also counted inside our own footprint reduction, and a tonne retired for a community is not restated as ours.

Credit eligibility is decided by the methodology and the verifier, not by us. Four of the six levers on this page are deliberately marked not eligible, and that will not change because a buyer would prefer otherwise.

Levers marked not eligible

Verified

Tonnes issued to date

Verified

Neutrality claims made

Verified

Methodology sources

[1]
Biochar methodology for durable carbon removal · Puro.earth
The accounting basis used here: durable removal by biochar, verified per batch and issued on a public registry, rather than avoidance offsets bought on a market.
Verified
[2]
Guidelines for the production of biochar · European Biochar Certificate
Char quality thresholds referenced in the characterisation requirement, including the hydrogen to organic carbon ratio and contaminant limits.
Verified
[3]
2019 Refinement to the 2006 IPCC Guidelines, biochar in managed soils · IPCC
That biochar carbon in soil is treated as long-lived in national inventory guidance, which is the basis for a permanence fraction rather than a full-carbon claim.
Verified