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: 9th July 2021

Xoserve successfully entered UEPT in May and have made good process with minimal defects. UEPT will continue throughout the Summer, with this phase ending in November. The Switching Programme is poised to enter E2E testing on the 12th July. E2E testing will allow licenced parties to undertake more extensive testing which will also include back office systems and consequential change to provide more confidence.

The Programme has successfully completed data migration non-functional testing and are currently in data migration live rehearsals which is a pre-cursor to transition testing. All Programme participants are very much focussing on the final transition and cutover phase. From a party under integration perspective the SI is working through planning and creating the transition runbook which will orchestrate the actual transition phase. For Licenced Parties this role is being undertaken the Programme Co-ordinator who will create a similar plan called the E2E cutover approach and plan (ECAP). These two plans are being bought together in the early stages with the Runbook being used as the basis of the ECAP.

Xoserve continue to run our extraordinary CSSC DSG Meetings, these are held on a monthly basis and include transition updates. We would encourage participation in this group as we are working through BAU processes in detail to understand the transitional impacts and rules. A UNC modification will be raised to implement the appropriate transitional elements once the approach is agreed by the Switching Programme and Industry Parties.

The Switching Programme has also commenced the Post Implementation Working Group which governs activities that feed into Business and Operational readiness ahead of Post Implementation (PIS). This group will also look at the framework that Industry Parties will have to work within during the post implementation period. Operational testing is currently underway both at the Programme level as well as within Xoserve internally.

As always we will continue to provide Programme updates at both Change Management Committee (ChMC) and Contract Management Committee (CoMC) forums. You have two dedicated customer account mangers to help you through this journey (Andy.Baugh@correla.com & Robert.westwood@correla.com). In order to support you through the Programme testing phase we also have a dedicated support manager Jo Galloway. If you wish to contact Jo please do so via xoserve.CSS.STS@xoserve.com

Any questions on the 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 17 Sep 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 - DES REL Function Overview

Last updated on 20 Sep 2021

Switching Programme Consequential Change - Shipper BRD

Last updated on 12 Aug 2021

UK Link File Format Change Summary

Last updated on 06 Jul 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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