Clean Heat Market Mechanism: report online, get credits
Use the Manage the Clean Heat Market Mechanism (M-CHMM) service to register for an account to report boiler sales and get credits.
You must must report your fossil fuel boiler sales if you’re classed as a ‘scheme participant’ or ‘near-threshold supplier’ in the CHMM.
Check if the CHMM applies to you and the timelines for action.
You must register based on your fossil fuel boiler sales for 1 April 2024 to 31 March 2025. You must include sales to wholesalers, installers and retail customers.
Check how fossil fuel boiler sales, targets and credits work.
The deadline to register is 30 April 2025.
The M-CHMM service is not ready yet. This page will be updated to link to it once it is live.
After you have sent an account registration application, the Environment Agency will review it. They will send you confirmation that they have granted you a CHMM account.
The information you need to register
Gather all the information you need to register before you start. This will be explained on the registration page of the M-CHMM service.
For a group of companies, this will include details of the responsible undertaking, such as their address and company number.
If you want to access CHMM credits after a heat pump installation, you must send the brand names of your heat pumps to chmm@environment-agency.gov.uk. The Environment Agency matches these brands to the relevant licence holder names listed by the approved certification scheme. This will allow you to receive CHMM credits
When registering, you need to name specific individuals for the following roles.
Registration lead
This is the person responsible for registering the undertaking or group of undertakings. This person should be directly employed by the responsible undertaking. They should have authorisation to manage compliance and engagement with the scheme. They can also manage the day to day activities with the CHMM.
Senior responsible officer (SRO)
This is the person in an organisation who will receive formal notices and legal correspondence. You can give a separate legal correspondence address. The SRO must be directly employed by the undertaking or the group of undertakings.
Additional users
You can add more users after you have created your CHMM account. These users may be consultants not directly employed by the undertaking or group of undertakings, but with the authority to act on your behalf. You’re responsible for managing users within your CHMM account.
You should have at least 2 users within your CHMM account.
How to complete CHMM tasks
You need to complete CHMM tasks either:
- in the M-CHMM service
- by emailing chmm@environment-agency.gov.uk
It is your responsibility to fulfil the obligations of the CHMM scheme. These obligations could include:
- sending information about changes to your company structure
- sending fossil fuel boiler sales figures, including any evidence and third party assurance where needed
- viewing your low-carbon heat target and managing your credits
- making payments when you do not have enough credits
- transferring credits to other organisations holding a CHMM account
- viewing and sending information about credit surrender and expiry at the end of the scheme year
Check how fossil fuel boiler sales, targets and credits work.
Responsible undertaking for a group of undertakings
A scheme participant or near-threshold supplier may be part of a larger corporate group, known as a ‘group of undertakings’. The CHMM Regulations define a group of undertakings as 2 or more undertakings which are group undertakings in relation to each other (as defined in section 1161(5) of the Companies Act 2006).
A group may include one or more fossil fuel boiler manufacturers.
CHMM treats these as one body where the fossil fuel boiler data is added together (aggregated). In deciding the thresholds, we will use this aggregated data.
A group of undertakings that are either a scheme participant or near-threshold supplier will need to select a ‘responsible undertaking’ from within their group. When at least one undertaking in the group is set up within the UK, the responsible undertaking must be one of these UK-based undertakings.
The responsible undertaking manages the CHMM obligations for the group. They also receive and need to act on CHMM notices from the Environment Agency. But each member of the group must make sure the group follows the requirements of the scheme. The group members are jointly and severally liable for any penalties imposed on a member of the group.
Company structure changes
Group undertakings must tell the Environment Agency about any change to the structure or membership of their group. They must do this within 28 days of the change.
They must include details of the change, with an explanation of how the group will divide its:
- CHMM credits (if applicable)
- fossil fuel boiler sales
- low-carbon heat targets
They should also tell the responsible undertaking about these changes.
Example
A group of undertakings that are a scheme participant sells one of its constituent undertakings. Their notification should show how the group and the new company will divide their:
- CHMM credits
- boiler sales
- low-carbon heat target
Depending on the change, this new separate company may have to register separately under the CHMM.
If you become obligated later
If you become obligated after 30 April 2025 and have not registered before, you must complete registration within 28 days. For example, this could be because you have reached the near-threshold supplier lower limit.
Registering as a credit holder
You can choose to register on the M-CHMM service if you’re a credit holder. You can do this if you want to transfer CHMM credits to scheme participants. You do not have to give all the same information as a scheme participant or near-threshold supplier.
How you’ll be regulated
Check how compliance, enforcement, and appeals work.
For help
Contact chmm@environment-agency.gov.uk if you’re unsure if the CHMM applies to you.