Switching programme (CSS)

Find out about the changes we introduced for a new Centralised Switching Service (CSS). View updates and access documents relating to the programme.

Page contents

    On Monday 18 July we launched the new Central Switching Service (CSS)

    We have created several training modules that outline all the changes we implemented in this programme.

    View training material


    What is the switching programme (CSS)?

    Ofgem, the energy regulator for Great Britain’s energy industry, introduced a programme aimed at improving consumer switching. These improvements needed to help consumers switch Suppliers more easily and with greater confidence.

    The switching programme replaced existing switching services with a new Centralised Switching Service (CSS).


    How was Xoserve involved in the programme?

    We worked with Ofgem to deliver the programme, which involved changes to the switching process for Shippers and Suppliers.

    To help the CSS function, we made consequential changes within UK Link and Gemini.

    Other areas affected by the CSS programme included:

    • data entry
    • interfaces or interactions between Shippers and Suppliers
    • processes being managed or maintained by the new CSS

    This work was called the Central Switching Service Consequential (CSSC) programme. 


    How we reported on our progress

    We shared updates with our customers through our: 

    • CSSC programme update
    • weekly programme status reports

    You can access these updates and reports below.

    CSSC programme final update: 20 June 2022

    In May we moved into the second of three implementation phases

    This involved activating APIs between UK Link and Landmark’s CSS system to successfully send updates back and forth.

    We’re targeting a go-live date of Monday 18 July

    We’re currently focusing on the final preparatory steps needed for go-live. This includes working with all parties to confirm everything is ready and in place.

    We’ve messaged all current Data Enquiry Service (DES) users, ahead of the move to the Gas Enquiry Service (GES)

    Our account managers have contacted all current DES users, ahead of the move to the GES. To avoid any disruption to your current access, you’ll need to ensure you are set up correctly for go-live.

    For more information on this, please email ges.transition@xoserve.com.

    Future training and awareness

    We’re committed to helping our customers through this change. We’ll continue to update this web page with key information about the programme and any important changes.

    In the meantime, access our online training module to get an overview of all the changes expected as part of CSS.

    Access training module


    Weekly programme status report

    Project documents

    Below, you’ll find key documents associated with the CSSC programme, including key risks and our draft business requirements.

    CSSC programme key risks

    DSG meeting for CSS consequential change

    Business requirements documents (BRD)

    Contact us

    If you have any questions about the CSSC programme, please email Emma Lyndon.