MOSL manages changes to the Market Arrangements Code (MAC) and Wholesale Retail Code (WRC) on behalf of the non-household market. Changes can be proposed by any industry participant and MOSL supports proposers to design and develop proposals prior to Panel review and Ofwat determination whether to implement the proposal. This page provides information on current changes, how to engage with the change process and how to propose new changes.

MOSL prepares a change report for the Panel each month describing the progress of each change proposal and the anticipated implementation programme.  The current change report can be downloaded from the link on the right.  Previous reports can be downloaded in the Panel papers.

MOSL may consult on behalf of the Panel to gather evidence on the need for and impact of a change proposal. Input from market participants and customers is welcomed and live consultations can be accessed through the link on the right.

If you wish to raise a change please follow the link on the right which provides templates and contact details to submit changes.

The Change Register below shows all proposals that have been formally submitted to change the Market Arrangements Code (prefixed CPM) or Wholesale Retail Code (prefixed CPW). Please use the filter and sort functions to navigate past and current changes and click on a change to view the documents associated with it.

Change Register

Reference Title Status Implementation date
CPW070 & CPM043 Bilateral Interfaces Solution Implementing 22/09/2021
CPM039 & CPW124 Revisions to Panel Composition Implementing 01/09/2021
CPM046 Approved Codes of Practice Planning -
CPW122 Introducing Direct Debit as a Payment Method Design -
CPW120 Final Meter Reads where no Visual Read is available In Consultation 02/12/2022
CPM044 Management of the Ofwat Innovation Fund In Consultation -
CPW126 Settling of Post RF Primary Charges In Consultation -
CPM045 Extending the right of the Market Operator to raise Change Proposals In Consultation -
CPW080 Simplification of the Default and Termination Process Awaiting Ofwat Decision -
CPW106 Management of Long-Term Vacant Supply Points Awaiting Ofwat Decision 05/11/2021
CPW110 & CPM041 Sharing Non-Household Emergency Contact Details Awaiting Ofwat Decision 13/05/2022
CPW117 Shortening the late payment default timeline for a credit support reduction Awaiting Ofwat Decision 05/11/2021
CPM015 & CPW071 Panel self-governance Awaiting Ofwat Decision -
CPM035 Panel Election Streamlining Awaiting Ofwat Decision -
CPW118 Minimum Meter Read Frequency Awaiting Ofwat Decision 13/05/2022

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