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: 7th January 2020

Over the past few weeks our UK Link design for both our interface to CSS and our consequential design have been under assurance with Netcompany the Programme System Integrator (SI). This assurance has seen many meetings being held either individually between Xoserve, SI and DCC or collectively to also include Landmark and other Industry representatives and existing service providers which resulted in a number of design assurance queries being raised within Jira. These sessions and the outstanding queries have all been completed and I’m really pleased to advise that this has resulted in the SI reporting a high level of confidence in our UK Link design. We are very happy to receive this level of assurance confidence in our design which we have comprehensively worked through and discussed with our customers throughout our high level and detailed design sessions over the past fifteen months. We again thank our customers for their support and input into this collaborative process.

From a readiness perspective Xoserve have received a ‘Green Status’ for our interim PIT exit report. A wealth of documentation was produced by our testing team in order to provide the assurance and confidence in our readiness for this phase. Our readiness confidence continues for the next milestones for the subsequent testing phases due to the hard work and diligence of our internal testing team.
Xoserve’s consequential market trials preparation continues with two dedicated Industry workshops being held on Thursday and Friday of last week to work through the lower level process scenarios. Feedback has been received to advise that the sessions were well received and attendees welcomed the level of detail. Registration for market trials is open until the end of February, I would encourage parties to take part in this phase in order to de-risk the programme and specifically the end to end programme testing phase, twelve participants have registered so far. The cut off registration date of end of February has been put in place in order to ensure we have the required time to create the testing portfolios participants will require. Late registration will put the creation of portfolios for your organisation at risk.

We have raised further programme concerns this week particularly in relation to the data migration solution. Following a technical data working group (TDWG) meeting this week it has been discovered that the data migration solution document which was baselined in November 2019 has undergone changes based on discussions held at subsequent TDWG’s. During all of these meetings Xoserve had repeatedly requested formal CR’s be raised in order for industry parties to impact assess these changes as the CR moved through formal governance, however the SI had assumed that based on the discussions within the workgroups that parties have incorporated the changes into their design without the need for a CR. This has resulted in disparity across industry parties as some have assumed this stance and others like Xoserve have not done so without an approved CR. This has been raised as a high priority programme risk with the request that the formal CR is raised as a matter of urgency.

SIT scenarios have been received for Service Management with five core processes currently being reviewed. A five day feedback period has been granted to parties for the turnaround of this review. Xoserve are still awaiting the formal plan to be issued to understand the full SIT requirements in order for us to plan accordingly. Service management and it’s inclusion in SIT is currently not included within the CSS Implementation Plan (CSSIP), Xoserve have requested a programme CR to be raised to ensure its inclusion.

There are other risk areas that we continue to track and progress via the programme governance. The detail on these can be found on this weeks SI weekly report which is published below.

If you have any questions or require further information please contact me 

CSSC Weekly Programme Status Reports

Switching Programme Weekly Status Report: 21st February 2020

Switching Programme Weekly Status Report: 21st February 2020

Last updated on 24 Feb 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

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