Market Domain Data

Market Domain Data is the central repository of reference data used by Suppliers, Supplier Agents and Licensed Distribution System Operators (LDSOs) in the retail electricity market. It is essential to the operation of Supplier Volume Allocation (SVA) Trading Arrangements. MDD is produced by the Supplier Volume Allocation Agent (SVAA) in the form of Data Transfer Network (DTN) flows D0269 (Market Domain Data Complete Set) and D0270 (Market Domain Data Incremental Set). The MDD change process is governed by BSCP509 ‘Changes to Market Domain Data’.

What is MDD Online?

Market Domain Data is available at MDD Online. The MDD subsite also features ad-hoc reports that may help you operationally.

How can I make a change to data in MDD?

Market Participants can submit requests to include or amend the data in MDD for information relating to their own Market Participant ID (MPID). These are submitted using the relevant Entity Forms, along with a BSCP509/01 Cover Form. These forms will need to be submitted by email to the MDD Co-ordinator. These must be with us by the deadline for the Version of MDD you want the changes to be included in – please see the MDD Release Schedule for a list of these dates.

BSCP509 Appendix 2 provides guidance on the how to complete MDD Change Request forms and shows how the validation process works. The MDD Entity Links Map helps identify the relationships between Entity Forms; this can be found at the bottom of this page.

What is the MDD Release Schedule?

The MDD Release Schedule shows the Change Request submission deadlines, Publish date and Go-Live date for each Version of MDD.

How am I informed of changes to MDD?

We issue two Circulars during each MDD Release. These can be viewed on the MDD Circulars page.

They are:

  • Impact Assessment Circular
    This Circular informs you of the proposed changes to be included in the next Version of MDD. A copy of all the proposed changes are attached to the Circular, and you are expected to carry out an impact assessment on these changes. If you have any comments in relation to a change, you should provide them to us within 5 Working Days of the Circular’s publication.
  • Final Circular
    This Circular confirms the changes being committed to the next Version of MDD. Once the Final Circular is issued, changes cannot be excluded from that Version.

An email notification is sent out whenever a Circular is published. If you would like to be included on the Mailing List, please email the MDD Co-ordinator.

How do I receive the MDD files?

You can nominate to receive MDD files via the DTN or email. Please let the SVAA know by emailing the BSC Service Desk stating which files you would like to receive and how you would like to receive them.

You will receive the files for the next Version of MDD on the MDD Publish date. If you do not receive these or you have any issues with the files then please contact the BSC Service Desk.

MDD Load Utility

We offer an MS Access tool which allows you to manipulate your MDD files for reporting purposes. You can download a copy from the zip folders below. Please select the correct folder depending on which version of the MDD files you receive.

MDD Load Utility [252 Kb]
Version: 002.0

MDD Load Utility [259 Kb]
Version: 004.0

Useful MDD Documents

BSCP509 Appendix 1 MDD Entity Change Request Forms

Market Domain Data Made Easy

Market Domain Data Overview

Market Domain Data FAQs


We welcome your feedback! Please comment on your experience and any comments you have on our processes. Please also let us know if you have any suggestions as to how we can improve this process by contacting [email protected].


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