Switching Programme

Providing faster, more reliable switching for consumers

Ofgem launched the Switching Programme to encourage consumers to engage with the same energy market, and to improve their experience of doing so. Its aim to deliver reliable, next day switching for consumers by replacing the existing switching services with a new Centralised Switching Service (CSS).

Welcome to Xoserve’s CSS page. This is the central reference point for our customers on Xoserve’s involvement in, and perspective on, the delivery of Ofgem’s Central Switching Service.

We are committed to keeping our customers fully informed on the delivery of this programme. On a weekly basis, we’ll share our Weekly Progress Report, our Day After Reports (DARs) and our updated view on key risks:

  • Our weekly Switching Programme Status report; this is the weekly report we’re required to submit to the System Integrator, and we’re sharing here for our customers to have the same update
  • Day After Report summaries of key program meetings; these are basic notes that we capture during meetings to share with internal to help with consistent knowledge levels across Xoserve, and to provide a contact point if more information is required. We felt that our customers would benefit from seeing these notes should you wish to understand more about Xoserve’s interactions with the programme.
  • Summaries of the key risks: this is a summarised version of our risk log of topics we believe are affecting the programme and the work that we’re doing to address these risks.

Going forward, we’ll look to widen the information we share based on what our customers are asking to understand. If there are additional updates that you would like, or if you have a comment about any aspect of the programme, please contact Emma Lyndon


CSSC Programme S
ummary: 6th March 2020

Both the Switching programme and Xoserve’s consequential programme continue to track to an Amber status.

These status’ are reflective of a number of risks associated to varying programme workstreams that in our view has the potential to impact on SIT readiness. Our key concerns continue to be raised at programme level and reported within our SI weekly status report which you can view on a weekly basis within this webpage.

It is becoming more and more evident via programme CR’s that the central physical design remains fluid which will require us to undertake additional activities and regression testing to hit SIT readiness. Change requests have also been raised relating to environment provision that had not been identified during the initial phases. We do have a concern that further environment requirements will be identified and this will have cost, effort and timeline impacts.

A new requirement surfaced during the SI technical data working group as we walked through the data migration testing solution plan. Whilst the requirement is sensible in using data migration data against SIT scenarios this had not previously been identified during the design phases of both the SIT testing approach or the data migration approach and therefore parties data migration environments may not have external connectivity to support this addition.

We have completed our internal data migration activity in order to provide the SIT data extract to Landmark in line with the programme milestone. This data will be securely transferred once we have received the connectivity details from Landmark. These are expected early next week at which point the migration activity will commence to populate the SIT testing data within Landmarks test environment in readiness for the commencement of external SIT.

Xoserve’s PIT testing phase continues. The interim PIT exit readiness reports and documentation has been assured and accepted by SI, therefore we continue to close internal SIT before PIT exit which is due on the 13th April. All major (blockers) defects found have been closed and Xoserve are on track to enter external SIT on the 14th April.

CSSC Weekly Programme Status Reports

Switching Programme Weekly Status Report: 13th March 2020

Switching Programme Weekly Status Report: 13th March 2020

Last updated on 03 Apr 2020

CSSC Prpgramme Dashboard March 2020

Last updated on 30 Mar 2020

Day After Report (DAR) Ofgem Data Working Group 23rd October 2019

Last updated on 28 Oct 2019

DAR for the SI Technical Data Working Group 3rd September 2019

Last updated on 06 Sep 2019

DAR for the Data Working Group 21st August 2019

Last updated on 23 Aug 2019

DAR for Service Management Integration Workshop 13th August 2019

Last updated on 21 Aug 2019

DAR for Ofgem Design Forum 12th August 2019

Last updated on 21 Aug 2019

Network Teleconference - 1st August 2019

Last updated on 09 Aug 2019

Data Working Group - Wednesday 17th July

Last updated on 19 Jul 2019

Switching Programme Delivery Group - Tuesday 16th July

Last updated on 19 Jul 2019

Design Forum - Monday 15th July

Last updated on 19 Jul 2019

Design Forum – Monday 1st July 2019

Last updated on 21 Nov 2019

Implementation Group – Tuesday 2nd July 2019

Last updated on 21 Nov 2019

Ofgem Testing Workgroup – Tuesday 2nd July

Last updated on 21 Nov 2019



CSSC Key Risks Summary

CSSC Key Risks Summary: 7th February 2020

Last updated on 07 Feb 2020



Last Extraordinary DSG Meetings for CSS Consequential Change Meeting - 24th January 2020

View Extraordinary DSG Meetings for CSS Consequential Change Meeting 24th January 2020 documents.



Draft Business Requirements Documents

UK Link File Format Change Summary

Last updated on 09 Sep 2019

Switching Programme Consequential Change - Gemini Business Readiness Document (BRD) v0.2 (clean)

Last updated on 29 Nov 2019

Switching Programme Consequential Change - Gas Transporter (GT) Independent Gas Transporter (IGT) Business Readiness Document (BRD) v0.2

Last updated on 29 Nov 2019

Switching Programme Consequential Change - Shipper Business Readiness Document (BRD) v0.7 (Clean)

Last updated on 29 Nov 2019

Draft Central Switching Service Consequential (CSSC) Programme Plan on a Page

Last updated on 11 Mar 2019

CSSC End to End To-be Processes

Last updated on 23 Sep 2019

Data Enquiry Service BRD

Last updated on 06 Feb 2020

Thank you for your feedback