2.6 Registry and avoidance of double counting


  • Projects and carbon units shall only appear on one carbon registry - the UK Land Carbon Registry
  • For group validation/ verification, the group and its constituent projects shall be entered on the registry as a 'master project' and 'subprojects' respectively
  • All projects, project documentation, carbon units, assignments and retirements shall be visible in the 'public view' of the UK Land Carbon Registry
  • Upon validation, Pending Issuance Units (PIUs) shall be listed for all carbon units in the project
  • Any Pending Issuance Units sold in advance of verification shall either be transferred to the relevant buyer's account or 'assigned' to that buyer
  • At each verification, Pending Issuance Units for that vintage shall be cancelled and the verified number of Woodland Carbon units (WCUs) issued
  • Prior to using Woodland Carbon Units in any reports, they shall be 'retired' from the UK Land Carbon Registry
  • Project developers shall comply with the registry rules of use

Project status on the registry will be checked at validation. Project and carbon unit status will be checked at verification.

Registry rules of use

1. What is the UK Land Carbon Registry?

The UK Land Carbon Registry ensures open and transparent project registration for both Woodland Carbon Code and Peatland Code projects, as well as Woodland Carbon Unit/Peatland Carbon Unit issuance, tracking and retirement. The service provided by IHS Markit Registry is a secure online application that tracks units generated by Woodland Carbon Code and Peatland Code projects. The registry incorporates a range of services including:

  • A project register: This accommodates both single projects and groups of projects.
  • A carbon unit register: This enables projects to issue units, assign or transfer them to credit buyers, and for credit buyers to use/retire/report them once verified.
  • A 'request for information' (RFI) platform: This provides a facility for project developers or brokers to 'offer for sale' any active (unretired) units, and for buyers to display their interest in purchasing units.
  • A public database: This provides public stakeholders the ability to view the status of all Woodland Carbon Code and Peatland Carbon Code activity. Please refer to Registry Public View

These rules of use refer to Woodland Carbon Code projects on the UK Land Carbon Registry.

NOTE that IHS Markit Registry Standard Terms and Conditions apply for aspects not mentioned here.

2. Accounts on the UK Land Carbon Registry

There are four types of accounts:

  • Project developer accounts – for organisations/individuals that own or manage projects, issue PIUs or WCUs and transfer units to corporate end users, retail aggregators or traders or assign/retire them on behalf of their clients
  • Buyer accounts – for organisations which buy carbon credits from WCC projects; this includes
    • corporate end user accounts for those who are ‘buying to use’ and can receive PIUs (to use/retire once verified) or WCUs (which can be used/retired immediately)
    • retail aggregator accounts for those who are buying on behalf of their corporate end user clients and will receive PIUs/WCUs and assign or retire them immediately on behalf of their clients
    • trading accounts for those who are ‘buying to sell on’ and can receive PIUs/ WCUs and assign/retire them on behalf of their clients or transfer them upon sale to other market participants.  However, Brokers must be registered and authorised by the Financial Conduct Authority to carry out a regulated activity under the Financial Services and Markets Act 2000. See the Financial Services Register.

Individuals cannot hold a buyer account. An individual can only buy verified Woodland Carbon Units to retire immediately – they could buy direct from the project developer or from someone with a retail aggregator/ trading account, who can ‘retire’ the units on their behalf making clear the reason (e.g. ‘Retired in 2020 on behalf of Mr Smith to compensate for his March 2019 London-New York flight’)

There is no cost for opening a project developer account. There is a £400 cost to open a corporate end user, retail aggregator or trading account (£200 for NGOs) (See Section 13).

All accounts will be public on the UK Land Carbon Registry.

3. Projects on the UK Land Carbon Registry

The various project statuses and the documents required at each stage are outlined below:

  • Draft - When the project developer has started to enter the project on the registry but not submitted it. (Details entered at this stage do not appear on the public registry).
  • Under development – The project developer has entered the project details and uploaded the draft carbon calculations and a map. The project is now ‘registered’ and will appear on the public view.
  • Validated – The project has been validated and documents have been uploaded; the final PDD, map, carbon calculations and Validation Statement (which will be public), and group agreement (which will remain private) if a group. Depending upon the project setup the project developer may also need to upload a document to show they own the right to the carbon units (a ‘proof of right’) or that they have the right to represent the landowner in the registry (a ‘communications agreement’). Standard content for these agreements is available from Markit or the Forestry Scottish Forestry.
  • Verified – The project has undertaken a verification and the documents have been uploaded: a Project Progress Report, Monitoring Report and a valid Verification Statement for that period.

There is no cost to register a project as 'Under Development'. However there are fees at Validation and Verification to issue and convert carbon units.

All projects will be shown on the public view of the UK Land Carbon Registry once they move from ‘Draft’ to the ‘Under Development’ stage. Project Documentation will be public unless indicated otherwise above.

4. Carbon Units on the UK Land Carbon Registry

The register includes two types of carbon units, which have different purposes:

  • Pending Issuance Units (PIUs): The purpose of these units is to demonstrate the quantity (tonnes CO2e) of potential future sequestration. PIUs will help to keep track of up-front sales/purchases (by assigning them to a buyer or transferring them to a buyer's account) but they cannot be used/retired/reported.
  • Woodland Carbon Units (WCUs): When a project is verified, PIUs which have been confirmed as sequestered will be converted to WCUs. These units can be considered as full carbon 'credits', and as such can be used/retired/reported.

PIUs and WCUs only exist in the UK Land Carbon Registry, and ownership can only be transferred between Markit account holders. Units are assigned a 'vintage', which is the time period in which they are anticipated to be delivered (PIUs) or were actually delivered (WCUs). Each unit is allocated a unique serial number.

All units, PIUs and WCUs, will be visible on the public view of the UK Land Carbon Registry.

5. Listing Pending Issuance Units on the UK Land Carbon Registry

Once a project is validated, Pending Issuance Units will be listed, in time periods called vintages or monitoring periods (see below), for the lifetime of the project. For groups of projects, units can be issued to each project within the group, or to the groups as a whole, if the carbon is to be sold collectively.

Vintages are determined by the monitoring and verification schedule as set out in WCC guidance. The first vintage is 5 years from the carbon project start date (last date of planting) and subsequent vintages are in 10-yearly periods. There are special arrangements for older projects whose first verification is not 5 years after the start date.

Scottish Forestry owns an account called ‘WCC PIU Buffer’ and the buffer contribution for each project will be allocated to this account. The PIU buffer cannot be claimed from; it simply indicates the potential size of the Standard’s buffer account once these units are converted to verified units.

For example, a 100-year project, which will generate 50,000 tonnes of carbon dioxide over its lifetime, where the risk assessment has indicated 20% of units should be allocated to the buffer, might list PIUs as shown in Table 1.

Vintage Length (years) Vintage Start Date Vintage End Date Total number of units Units allocated to Buffer Units allocated to Project
5 1/4/2013 31/3/2018 500 100 400
10 1/4/2018 31/3/2028 4651 930 3721
10 1/4/2028 31/3/2038 14378 2876 11502
10 1/4/2038 31/3/2048 11779 2356 9423
10 1/4/2048 31/3/2058 6758 1352 5406
10 1/4/2058 31/3/2068 4439 888 3551
10 1/4/2068 31/3/2078 2379 476 1903
10 1/4/2078 31/3/2088 1550 310 1240
10 1/4/2088 31/3/2098 1457 291 1166
10 1/4/2098 31/3/2108 1699 340 1359
5 1/4/2108 31/3/2113 412 82 328
Total Units over project lifetime 50000 10000 40000

Table 1: Allocation of units to vintages for a project which will sequester 50,000 units in total.

There is a cost to list Pending Issuance Units: Upon validation, the project developer is required to pay Markit 6 pence per unit to list PIUs for the lifetime of their project. Units are initially listed in the project developer’s account. The project only pays for units issued to the project (and not those issued and transferred to the buffer). In this case, 40,000 x 6p = £2,400. This 6p/unit cost can be added to the price of carbon units sold.

All issuances will be shown on the public view of the UK Land Carbon Registry.

Pending Issuance Units cannot be sold to individuals.

6. Transferring units to a buyer

This section refers to either Pending Issuance Units or verified Woodland Carbon Units. Sales of carbon units are conducted between the parties on a one-to-one basis, but once agreed, the project developer must make clear the buyer. This can be done in one of two ways:

  • By assigning units to the buyer within the project developer's account. Assignment is a way of demonstrating the sale of a unit without requiring the buyer to have an account on Markit Registry.
  • By transferring units to the buyer's account.

Both seller and buyer have to agree to the transfer before it can take place.

There is no cost to assign or transfer units to a buyer.

All holdings will be shown on the public view of the UK Land Carbon Registry.

7. Converting Pending Issuance Units to verified Woodland Carbon Units

When a project is verified at the end of a period/vintage, the number of Pending Issuance Units verified in the period / vintage will automatically be converted to verified Woodland Carbon Units once the Markit Operations checks on Monitoring and Verification reports are completed. This will occur both for PIUs originally allocated to the project (which may have already been sold on) as well as those allocated to the WCC PIU buffer account. Units issued as PIUs will retain the same serial numbers as WCUs. PIUs which are already assigned to a buyer will be automatically retired.

This principle is fine where the actual verification indicates the same number of units as the prediction. However an approach for dealing with instances where the actual verification differs from the prediction is outlined below and is in line with the way most existing carbon markets would operate if a project over- or under-delivers within a given vintage:

Note: bear in mind the prediction / allocation of PIUs in Woodland Carbon Code projects is very conservative, so we hope that, if anything, projects are likely to over-deliver; the possibility that they would under-deliver is minimal unless poor management or unavoidable circumstances mean the project is failing for some reason.

For a given vintage, if verification confirms more units were delivered than allocated to PIUs: In proportion the additional units are allocated to the project and the WCU buffer (Table 2).

  PIUs (Prediction) Actual Verification Action Cost of Transfer
Buffer 20 22

20 PIU Buffer units converted to WCU Buffer units.

2 WCU Buffer units listed.

Project 80 88

80 PIUs converted to WCUs.

8 WCUs issued to the project developer.

3 pence per unit for the 88 WCUs issued.
Total 100 110    

Table 2: Conversion of PIUs to WCUs in the case of over delivery

If verification confirms fewer units were delivered than allocated to PIUs: In proportion the fewer units are allocated to the project and the WCU buffer. PIUs not delivered are cancelled (Table 3).

Table 2: Conversion of PIUs to WCUs in the case of overdelivery

If verification confirms fewer units were delivered than allocated to PIUs: In proportion the fewer units are allocated to the project and the WCU buffer. PIUs not delivered are cancelled (Table 3).

  PIUs (Prediction) Actual Verification Action Cost of Transfer
Buffer 20 18

2 PIU Buffer units cancelled.

18 PIU Buffer units converted to WCU Buffer units.

Project 80 72

72 PIUs converted to WCUs.

8 PIUs - the last in serial number order - are cancelled. If sold, this is a contractual non-delivery of goods issue for the seller and buyer to resolve.

3 pence per unit for the 72 WCUs issued.
Total 100 90    

Table 3: Conversion of PIUs to WCUs in the case of under delivery

Contracts between buyer and seller might need to be flexible about the amount delivered but not the timing, for example:

  • Guaranteed (I’ll give you 100 units in year x. If it’s not from my project I’ll give you some from another WCC/other project) or
  • Unit-contingent (I’ll give you about 100 units in year x +/- y%. Pay for what I deliver).

There is a cost associated with issuing Woodland Carbon Units: Project developers will pay Markit 3 pence per unit to convert WCUs upon verification. The number of WCUs issued will be charged. For example in Table 1, for the first vintage (1/4/2013-31/3/2018) 400 units converted at 3p/unit = £12.00. This 3p/unit cost can be added to the price of carbon units sold.

8. What if Pending Issuance Units are not verified on time or at all?

Pending issuance units shall be verified by the last date of a vintage period, unless there are extenuating circumstances for a delay which should be agreed with Scottish Forestry. Extensions might be granted if, for example:

  • You demonstrate you’ve applied to the verifying bodies in good time but they are unable to process your validation before the deadline
  • A verification suggests corrective actions but they cannot be completed before the deadline due to weather/time of year etc.
  • Projects which are geographically close are due to be verified in consecutive years and you would like to verify the two projects together

If a project developer has an agreed extension they must upload a signed Verification Extension Approval to the registry. Carbon units (both PIUs and WCUs) can be transferred as normal.

If you do not verify by the last date of the vintage period or any agreed extension:

  • ALL remaining PIUs for the duration of the project are cancelled (those owned by the project, those sold and buffer units)
  • Any unsold WCUs are automatically retired
  • WCUs (sold and buffer) from previous vintages remain valid
  • The project remains in the system and is marked ‘Discontinued’
  • No further units can be issued at any time.
  • It is still possible for existing buyers sell on or retire WCUs held from previous vintages.

9. Withdrawing a project from the UK Land Carbon Registry

It is possible for a project developer to withdraw from the WCC and the registry before the end of the project duration in the following circumstance: If all units sold have been delivered as verified WCUs and only unsold PIUs remain. In this case, all WCUs will remain valid (both for the project and the buffer) and PIUs (unsold and buffer) will be cancelled. Future management must maintain the level of carbon stock that has been sold.

There is no cost to cancel PIUs/retire WCUs in any of the cases listed in 9.

10. Using verified Woodland Carbon Units

Only verified Woodland Carbon Units can be used or reported to help compensate for a company’s or individual’s emissions. The WCC guidance 2.7 carbon statements and reporting gives further information.

The process for representing the ‘use’ of a verified Woodland Carbon Unit in the registry is by ‘retiring’ (putting beyond use) the units you wish to use, and leaving a retirement remark as desired (e.g. ‘Retired in 2020 as compensation for 500 tCO2e of our 2019 emissions as detailed in our Annual Environmental Report 2019’).

All retirements will be shown on the public view of the UK Land Carbon Registry.

11. Offering Units for Sale on the UK Land Carbon Registry

Markit’s Request for Information (RFI) Platform is an additional avenue to liquidate credits; It is an anonymous online platform for the over-the-counter (OTC) environmental credits market that displays credits available for sale. The RFI Platform also allows buyers to display their interest in purchasing credits including indicative quantities and prices. These credits are searchable and viewable by registered participants. Upon expressing an interest in any credits ‘for sale’ or ‘wanted’, the buyer or seller can send an "Expression of Interest" to the counterparty. Introduction through the Markit RFI platform then enables the two parties to start discussions on the terms of a potential transaction.

Regarding the pricing of credits, it is the seller who decides the price and Markit does not provide any information / consultation.

There is no fee to use the Request for Information Platform which is accessible by anyone with a Markit Environmental Registry account.

12. What happens if account-holder circumstances change?

Project Developers: If a project developer wishes to exit the business it is possible to transfer projects to another project developer or management organisation, sell or retire carbon units and then close their account. However, if a project developer abandons its account(s) with the UK Land Carbon Registry without arrangements for the ongoing management of units by another organisation (or its agreement with Markit is otherwise terminated) then;

  • All PIUs listed for that project developer will be cancelled regardless of which account holders may be holding the PIUs at the time of cancellation
  • Any WCUs still held by the project developer will be transferred to a ‘suspension’ account. If resolution of that account is not corrected within 5 years those credits will be retired
  • Any WCUs already received by a buyer (in a subaccount or a corporate end-user account) will remain valid in the buyer’s account
  • A buyer of WCUs who holds their units in a subaccount of the closed project developer account can have their account converted into a corporate end-user master account at zero cost.

Buyers: If a corporate end user or trading organisation is acquired by another organisation then it is possible to transfer units to the purchasing company’s account. However, if a Corporate End User or Trader who holds PIUs or WCUs abandons its account(s) with the UK Land Carbon Registry without arrangements for the ongoing management of its units (or its agreement with Markit is otherwise terminated), all PIUs or WCUs listed for that account holder will be put on hold until further instruction is received from the liquidator or administrator. If no instruction is received within 5 years, then any remaining PIUs will be cancelled and WCUs in the account will be retired.

13. Registry Fees

This is a summary of the fees involved in using the registry. They are also detailed above in the relevant section. See full details of fees.

Costs for Project Developers:
Project developer costs have been kept to a minimum and it's FREE for a project developer to open an account on the registry.

The total fees payable are only 9p per unit over the project's lifetime. This is broken down into

  • 6p per unit for listing of PIUs, payable at validation (This includes a 3p/unit WCC Levy which goes to Scottish Forestry to help fund the management costs of the Woodland Carbon Code)
  • 3p per unit to convert PIUs to WCUs or PCUs, payable at each verification for the units verified.

Costs for Carbon Unit buyers, retail aggregators and traders:
Carbon Unit buyers are required to pay a fee to create an account as follows:

  • £400 for businesses
  • £200 for NGO's

Once a carbon buyer pays a one-off fee for an account it means they can:

  • purchase carbon units (pending issuance or verified) from any Woodland Carbon Code or Peatland Carbon Code project (listed on the registry) and have them transferred to your account (on the registry)
  • demonstrate use (i.e. retirement) of Woodland Carbon Units or Peatland Carbon Units
  • access the RFI platform (a 'for sale' and 'wanted' board) to see Woodland Carbon Units, Peatland Carbon Units and other carbon credits available for purchase

Full details of fees

14. Flowchart summarising the project registration and carbon unit issuance process

WCC flowchart Jan2014 1


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