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
CPM015 & CPW071 Panel self-governance Awaiting Ofwat Decision -
CPM035 Panel Election Streamlining Awaiting Ofwat Decision -
CPW067 Bulk Submission of Service Requests via MS Excel On hold -
CPW085 Premises Vacant transaction link to DPID On hold 30/11/-0001
CPW120 Final Meter Reads where no Visual Read is available On hold -
CPW001 Cross Border Matters Implemented 02/10/2017
CPW002 CSD0301 Updates - Meter Treatment Implemented 02/10/2017
CPW003 CSD0301 Updates - Meter Networks Implemented 02/10/2017
CPW004 CSD0301 Updates - Meter Networks (Future) Implemented 02/10/2017
CPW005 Self Supply Implemented 03/07/2017
CPW006 CSD0301 - New data item updates Implemented 02/10/2017
CPW007 Alignment to Customer Protection Code of Practice Implemented 02/10/2017
CPW008 Direction to Supply Implemented 02/10/2017
CPW009 CSD 0302 updates - alignment with CSD 0301 Implemented 02/10/2017
CPW010 Emergency Contact Details Implemented 28/09/2018

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