Switching Programme

Providing faster, more reliable switching for consumers

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: 31st March 2021

The Programme is very much on track to commence the Industry UIT Testing phases with all participants undertaking their relevant steps to ensure readiness for the commencement of UEPT Cycle 1 in July. Since I posted my last update I am very pleased to be able to confirm that a number of key Programme milestones have been met.

Data Migration Non-Functional testing has completed and met the Programme milestone for the completion of this phase. This milestone being met ensures that the readiness activities for Live Rehearsal testing can now commence for all the relevant parties. Xoserve have exited this phase with a couple of P3 defects that are currently undertaking a fix, these will be part of a work off plan with the SI and will be re-tested during Live Rehearsal.

For readiness for Live Rehearsal we have completed our Smoke Test with the Programme and will now be clearing down our environments to refresh the data prior to commencement of this phase. Live Rehearsal testing will be undertaken by all parties under integration, this includes Xoserve, Electricity DNOs and Landmark. The phase will be co-ordinated and monitored by the SI.

Our UEPT data was provided to the SI in January, this has been successfully loaded into the UEPT environment by Landmark alongside our MDD data. We are currently awaiting return of REL ID and REG ID which we are expecting from Landmark prior to the 12th April, this data will be loaded into our UEPT internal environment to be used for testing of this phase. Connectivity tests have completed and been assured, we are now very much ready for this first Industry testing phase.

Preparations towards the Operational Testing phase are also in progress. This phase of testing is focussed on aspects such as Security, Business continuity and Service Management.

Xoserve’s internal consequential change testing has completed this month. This has been a very successful testing cycle which has seen few defects and has been collaborative phase with our Programme Testing Workstream and Xoserve’s business SME’s who have assured the testing output. The success of this cycle gives us a lot of confidence for the UIT Testing and we look forward to testing these changes externally with you during E2E.

Our CR to remove Market Trials from the Programme Plan has been approved at the Ofgem Change Advisory Team Workgroup (CAT), this CR is now progressing through the Ofgem Testing Working Group Governance, once completed the relevant milestones will be removed from the Plan. We will continue to support our customers through the Programme E2E phase as it during this phase that the consequential change activities will be tested by Industry Participants. We will be on hand to support our customers and are currently working through IX and API set up conversations during workgroup conversations. Jo Galloway hosted the final Market Trials Workgroup last week and will now be chairing a Support Workgroup to continue these support discussions.

Those of you who participate in the Programme Workgroups and correspondence will notice that we have raised a CR (CR-072) to align our Standard of Service response to those proposed by the Switching Programme. We are aligned in all other Service Management aspects but for the response times we have requested an extra ten minutes be added, an example of this is for a P1 defect where the participant is asked to respond in 10 minutes, we have asked for this to be extended to 20 minutes which will provide us with the time to quickly analyse the defect and collate the required resource for defect resolution. This CR has been introduced at the Ofgem CAT Workgroup
Transition Readiness Activities are progressing to plan, with both whole Industry planning taking place at the relevant SI and Ofgem Workgroups as well as our internal planning. This phase is critical for our customers and we will be supporting you and talking you through the detail of these plans during our CSSC DSG meetings where this is a standard agenda item as we move into this phase. I would recommend your attendance and interaction at these meetings as we will be establishing business rules as well as understanding the Governance aspects as UNC will be required to align to REC and the Switching Programme Go Live.

If you wish to understand more detail on any of the topics I have covered above, please do not hesitate to contact me at emma.j.lyndon@correla.com



CSSC Weekly Programme Status Reports

Switching Programme Weekly Status Report

Last updated on 04 Jun 2021

CSSC Programme Dashboard 2020

Last updated on 12 Apr 2021

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

Switching Programme Consequential Change - DES BRD

Last updated on 09 Feb 2021

Switching Programme Consequential Change - Shipper BRD

Last updated on 09 Apr 2021

Switching Programme Consequential Change - Shipper BRD

Last updated on 11 Feb 2021

UK Link File Format Change Summary

Last updated on 09 Jun 2021

Switching Programme Consequential Change - Gemini BRD

Last updated on 29 Nov 2019

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

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

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