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: 18th September 2020

Since my last programme update the data migration non-functional milestone has been met following the completion of all three cycles. In the first cycle of the phase, a number of defects were seen as expected, however this has improved with both Cycle 2 and Cycle 3. Full data migration functionality has been tested, including deltas and in-flights. The phase has now closed out with high confidence in the data migration solution. Data migration testing will continue within data migration non-functional testing, live proving and transition testing phases. Two approved Check Reads (CRs) in relation to data migration are planned to be delivered and tested during data migration non- functional. These are CRD016 which provides the registration ID to existing service providers during transition and CRD026 which aligns the physical interface document with the data migration solution.

System Integration Testing (SIT) functional Cycle 2 testing continues but issues are still being seen. Concerns are being raised to understand the impact of these issues as the gap between planned vs executed tests is widening. External SIT non-functional requirement (NFR) testing remains halted at the moment. We understand that activities will re- commence shortly but are pending confirmation from the programme as to when this is likely.

Xoserve Internal User Acceptance Phase continues. To date we have completed 215 planned test scripts and have seen a low level of defects, with only 23 being seen none of which have been a P1 or P2 defect. The phase continues to plan with a high level of confidence.

Xoserve’s Market Trails phase will continue to be re-planned in line with the programme re-plan and subsequent discussions with our workgroup participants. As soon as we have received and assessed the programme re-plan and Milestones, Assumptions and Dependencies (MAD) log detail we will provide our feedback and plan for the market trials timeline with both our customers and the central programme.

The programme re-plan detail and revised MAD log were both due to be issued to Industry participants for review today (18th September). A programme communication was issued yesterday (17th September) to inform that the release of this detail will now revert to 25th September. As soon as we receive the plan detail we will be assessing against our internal plans from a time, resource and cost perspective and will feed back any concerns to both our customers and the central programme as per the feedback governance.

I have provided updates at both Contract Management Committe (CoMC) and Change Management Committee (ChMC) over the past two weeks, our programme dashboard and workstream summaries can be found against these workgroup meetings should you wish to pick up this detail..

If you have any questions around these updates or further information, please contact me at emma.j.lyndon@xoserve.com

CSSC Weekly Programme Status Reports

Switching Programme Weekly Status Report

Last updated on 28 Sep 2020

CSSC Programme Dashboard 2020

Last updated on 17 Jul 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)

Last updated on 29 Nov 2019

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

Last updated on 29 Nov 2019

Switching Programme Consequential Change - Shipper Business Readiness Document (BRD)

Last updated on 14 Aug 2020

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

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