Gemini e-learning

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Learn how to use Gemini

We have a range of online training materials for customers to explore. They help you learn how to use – and get the most from – Gemini and Gemini Exit.

Gemini Exit (NTS external) user guidelines – individual chapters:

Test your Gemini API set-up

Many of our customers use application programming interfaces (APIs) within Gemini. These are useful mechanisms for sending and retrieving large sets of data.

Useful API documentation

The Gemini API User Guide has been written to give Gemini Users an overview of the API facility available in relation to the Gemini System. Along with the Gemini Exit API Specification Document, which contains technical details on the structure of the APIs.

Risk-free testing

Prior to any live set-up, you may wish to test your processes.

To help you do that, we offer a secure, offline testing environment. It’s a mirror-image of the live Gemini API landscape and allows for true-to-life testing.

If you’d like to use the Gemini test environment, but aren’t registered, ask your Local Security Officer (LSO) to contact our Service Desk.

Email: servicedesk@xoserve.com

Call: 0845 600 0506

What information will the Service Desk need?

Our team will need to know:

your Shipper organisation name and short code
your start date and end date for access
whether access is required to test APIs, online screens or both
details of live Gemini User IDs to copy in the testing environment

For API testing, please give details of which APIs or API controllers will be tested.

For accessing and testing of screens, please confirm:

which screens will be accessed
whether data will be entered – and which fields will be used
details of the test cases to be executed

Common queries

To remove this lock, please call National Gas Transmission on 0370 191 0636. If you need further support, please call our Service Desk on 0845 600 0506. In both cases, you’ll be required to provide your Service ID, your User ID and the Gas Day.

Your User ID could have been locked for one of the following reasons:

For GB Nominations, if two or more different User IDs try to update the same set of records (e.g. a combination of Service ID and activity number for that Gas Day), an error message will be displayed indicating that the records have been locked by another user.
GB Nomination locks are auto-released after 60 minutes of the locks being applied. The user will get the same error message on the screen. Wait for 60 minutes for the locks to be auto-released.
For EU Nominations, if the same connection point and shipper combination are being used by two or more different users to update the EU Nomination for a Gas Day, the data will be locked.
The same restriction will occur if you select 'All' as the connection point and nominate using multiple User IDs. However, in this instance, all the connection points will be locked.

Whenever you exit from the Update Nomination Screen, it's essential to click on the Cancel/Save button and exit. If you click on the red X in the top right- hand corner, the data will remain locked by that User ID.

However, if the screen is left open, the lock will be in place for as long as the screen is open.

First check that the system is not within the Gemini maintenance window.

Maintenance windows

Monday to Saturday 3:15am–4:15am

Sunday 3am–5am

If you’re trying to access the Gemini System outside of the Gemini maintenance window and are unsuccessful, you’ll need to raise a technical support request.

If the Demand Attribution figure looks incorrect, you’ll need to call our Service Desk on 0845 600 0506.

For any issues relating to Demand Attribution, you can raise a technical support request.

You can request measurement data using the MEI file type. When the Gemini system has received the file, it will get processed and a response will be sent back via an MEO file type.

The file formats are available via the UK Link System.

(Then folder 01. SharePoint Archive/Gemini folder/Gemini File Formats folder/Energy Balancing Bulk Uploads and Downloads folder/choose 'Bulk Download of Pre-Closeout Measurement' document)

*Access to secure links are only available to gas shippers and transporters. To gain access find out about accessing secure documents.

There are 22 meter types in Gemini:

Meter Type	Meter Type Description
DI	Daily Metered Aggregate Interrupt
NA	Non-Daily Metered Aggregate
NB	National Balancing Performance Testing
NL	National Transmission System Linepack Off-take (OF)
OF	Offtake
OS	Onshore Field
SC	Local Distribution Zone Stock Change
SE	Entry Meter – Storage
SH	Shrinkage Account Meter
SR	Reject Gas/Flash
ST	Sub Terminal
SX	Exit Meter – Storage
XF	Exit Firm – Storage
XI	Exit Interrupt – Storage
US	Unique Site
IB	Information Provisioning Input Balancing Meter
OB	Information Provisioning Output Balancing Meter
DF	Daily Metered Aggregate Firm
DC	Daily Metered Consumer
UG	Unidentified Gas
BL	Boil Off
BN	National Transmission System Boil Off

Access secure links

Some e-learning materials are secure and only available to Shippers and Transporters.

Get access

Gemini e-learning

Discover how to use every aspect of Gemini – and get the best from the system.

Learn how to use Gemini

Get to grips with the Gemini user interface.

Discover the different types of Gemini invoicing and file formats.

Understand the different reasons Nominations can become locked.

Understand the EU Nomination process.

Learn how to use Gemini Exit confidently and efficiently.