Gemini System Enhancements (GSE)

About GSE

The Gemini IT system underpins the commercial gas transmission regime and accounts for all capacity and energy transactions.

GSE is a project to adapt and improve Gemini, delivering over 65 enhancements based on the needs of a changing industry.

GSE is also referred to as change XRN5122. 

User Trials

User Trials are scheduled between 1–25 June 2021.

User Trials registration has now closed, and invitations to the initial briefings on 5th May 2021 have been issued. If you have registered and haven’t received an invitation please email .box.xoserve.GeminiSystemEnhancements.

What will you need to do?

Information on what to do next is detailed in the GSE User Trials Information Pack (below). Interested parties will need to confirm the enhancements they wish to test, the BA code to be used for testing and the number of testers who will be participating. This is done by populating the GSE User Trials Spreadsheet (also below) and returning it to .box.xoserve.GeminiSystemEnhancements

Please note you will also need to confirm connectivity test prior to the start of the User Trials.

How User Trials will progress

  • There will be briefing sessions, and those that register for participating in the trials will be sent an invitation to attend. These are proposed to take place between 3rd May 2021 and 28th May 2021. The schedule for these sessions will be compiled following completion of the registration process.
  • A full-scale Gemini environment will be available for User Trials
  • Shipper accounts will be created in the Market Trials environment, and log in details provided. This is why we need to set a cut-off date to register for the Trials.
  • Xoserve will propose test scenarios to be tested to ensure the data conditions can be achieved.
  • Details will be provided of any configuration activities required to establish connection ahead of the connectivity testing starting.
  • Connectivity testing is being proposed between 17th May 2021 and 21st May 2021, to ensure all parties who have registered can connect to the User Trials environment. To be able to proceed to User Trials connectivity testing will need to have been completed and confirmed.
  • User Trials execution will take place between 1st June 2021 and 25th June 2021.
  • Testing throughout the User Trials period will take place in real time and it is essential that all parties adhere to the test schedule shared by Xoserve.

Common queries

Yes, all 43 existing APIs will still be available over IX.

GSE is introducing 13 new APIs, which will also be available over IX.

One existing ‘API Re-nominations details’ will be amended to include two additional fields:

COUNTR_PARTY_BA

TRD_OR_NONTRD

Yes, the 13 new APIs that GSE is introducing will be available over IX along with the 43 existing APIs.

Yes, all 43 existing APIs will be available over the internet without having to use the Information Exchange (IX) network.

GSE is introducing 13 new APIs, which will also be available over the internet.

One existing ‘API Re-nominations details’ will be amended to include two additional fields:

COUNTR_PARTY_BA

TRD_OR_NONTRD

Please see ‘Section 2’ of the API Specification Document on this webpage.

‘Section 2’ explains the process and technical specifications required to access the APIs over the internet without using the Information Exchange (IX) network.

For accessing the APIs over the internet without using the Information Exchange (IX) network, the data exchange file format is both XML and JSON.

More information is available in the API Specification Document on this webpage.

User Trials are scheduled between 1 June 2021 and 25 June 2021.

If you would like to take part, please email the GSE project team .

For all queries, please email the GSE project team.

Yes, there is a support call every weekday during the User Trials window.

If you haven’t received an invitation, please email the GSE project team, for invitations and times of the calls.


Further information

For more information, please email the GSE project team.

Project documents

GSE Auction Linepack and Demand Schedule

Last updated on 24 May 2021

GSE API Specification Document

Last updated on 18 May 2021

GSE External Screens Pack

Last updated on 06 May 2021

Gemini API User Guide

Last updated on 06 May 2021

GSE User Trials Information Pack

Last updated on 05 May 2021

GSE User Trials Spreadsheet

Last updated on 26 Apr 2021

Thank you for your feedback