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At the heart of the UK Gas Industry

Gemini FAQs

Introduction

The purpose of this webpage is to provide a fast response to queries as the information is readily available. The questions listed below cover a wide range of topics and the most frequently asked questions: this is not an exhaustive list. New questions will be added as and when more information is available.

If you have any questions that are not contained within the document, please raise a ticket with the Xoserve Service Desk by emailing servicedesk@xoserve.com.

Energy Balancing

Meter Details

  • Scenario 1: When Nominations are present – no, it is not possible to delete the activity.
    Scenario 2: when a Nominations is not present – yes, it is possible to delete the activity.

  • Shippers can create a Nomination activity on their own. A step-by-step guide can be found on the Gemini Training page. Once at the page you will need to click on “Gemini e-Training”.

    If you do not have access to Gemini e-Training you will need to request access using the Access Form.

  • here are 22 Meter Types in Gemini. Please find the Meter Type Code and their     names in the table below.

    Meter Type Meter Type Description Meter Type Meter Type Description
    DI DAILY METERED AGGR INTERRUPT SX EXIT METER – STORAGE
    NA NON-DAILY METERED AGG XF EXIT FIRM – STORAGE
    NB NATIONAL BALANCING PT XI EXIT INTERRUPT – STORAGE
    NL NTS LINEPACK US Unique Site
    OF OFFTAKE IB IP INPUT BALANCING METER
    OS ONSHORE FIELD OB IP OUTPUT BALANCING METER
    SC LDZ STOCK CHANGE DF DAILY METERED AGGREGATE FIRM
    SE ENTRY METER – STORAGE DC DAILY METERED CONSUMER
    SH SHRINKAGE ACCT METER UG UNIDENTIFIED GAS
    SR REJECT GAS / FLASH BL BOIL OFF
    ST SUB TERMINAL BN NTS BOIL OFF
  • A new Unidentified Gas ‘Meter ID’ will be created per Shipper per LDZ / Exit Zone – this will be identified as SSC Exit Zone UG.

    For example: XXXEA1UG where XXX is the Shipper three lettered code.

  • The activity is created automatically by the Gemini System on behalf of the Shippers.

Demand Attribution

  • If the Demand Attribution value looks incorrect, you will need to contact the National Grid Control Room who will be able to confirm if the value is correct. If the Demand Attribution value is published incorrectly, the Control Room will advise. You can contact them by calling 01926 653 206.

    The next Demand Attribution publication will override the previous value with the correct data; therefore, you are able to wait until the next publication. If it is the end of day Demand Attribution publication which has doubled, then you will need to raise a ticket with the Xoserve Service Desk by emailing servicedesk@xoserve.com.

  • The Forecast Unidentified Gas is calculated for each LDZ and will be apportioned to Shippers within and LDZ using the Allocation Adjustment Factor on D-1 for the Gas Flow Day.

    The Allocated Unidentified Gas is calculated for each LDZ and will be apportioned to Shippers using the Allocation Adjustment Factor. This is calculated on D+1 for the Gas Flow Day.

  • Below are the names of the two online screens and one API through which Shippers can view both Forecast and Allocation Unidentified Gas Quantities.

    Screens:

    • Shipper Forecast UIG report
    • Shipper Allocation UIG Share report

    API

    • View Shipper UIG Values
  • The UIG process commences only after the NDMA Nominations are published.

  •  

    Information is available on the Gemini Training page. Once at the page, you will need to click on Gemini e-Training.

    If you do not have access to the Gemini e-Training page, you will need to request access using the Access Form.

  • The value calculated for Total energy forecast depends on the CWF value as this is the only value that changes within the day, as there is no CWF file received between 4:00 pm and 9:00 pm the value for the Forecast remains the same.

Nomination/Renomination

  • A document for the Nomination Upload (NMU) file format can be accessed on the UK Link Documentation page. Click on the “SharePoint site” link to access.

    Once logged in and loaded, click on folder ’07. Gemini’, Gemini File Formats, Energy Balancing Bulk Uploads and Downloads and choose the document titled “Bulk Upload of Nominations”.

    If you do not have access to the UK Link Documentation SharePoint site, you will need to fill out and submit a Secure Site Access Form.

  • For the 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.

    For the EU Nominations, if the same connection point and shipper combination is being used by two or more different user IDs 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 is mandatory 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.

    If the screen is left open, the lock will be in place for however long the screen is open.

    To remove the lock you will need to contact the National Grid Control Room. They will require the Service ID, your User ID and the Gas Day. You will be able to contact them by calling 01926 653 206.

  • You will receive this error if the requested energy is less than the energy which has already flown. You will need to enter a higher energy value than that which has already flown. If your requested energy is correct, please contact the National Grid Control Room who will be able to override the Nominations. You can contact them by calling 01926 653 206.

  • Manual approval of a Nomination can only be carried out by the National Grid Control Room. You can contact them by calling 01926 653 206.

    Please note that they will only approve a Nomination manually if there is an issue with the system.

  • Please check if you are placing the Nomination/Renomination within the below specified timelines.

    UK Nomination/Renomination

    Input / Output Type Start Time End Time
    Input Nomination (D-35) 05:00:00 (D-1) 14:29:59
    Input Renomination (D-1)  14:29:59 (D) 02:59:59
    Output Nomination (D-35) 05:00:00 (D-1)  12:59:59
    Output Renomination (D-1) 14:29:59 (D) 02:59:59

    *UK Nomination Lead Time – 02:00 hours from Nomination*

    Example

    An Input Nomination for flowing energy for Gas Day 13th June 2017 (D) can be placed from 8th May 2017 05:00:00 (D-35) until 12th June 2017 14:29:59 (D-1).

    An Input Renomination for flowing energy for Gas Day 13th June 2017 (D) can be placed from 12th June 2017 14:29:59 (D-1) until 13th June      2017 2:59:59 (D).

    EU Nomination/Renomination

    Input / Output Type Start Time End Time
    Input Nomination (D-35) 05:00:00 (D-1) 12:59:59
    Input Renomination (D-1)  15:05:00 (D) 01:59:59
    Output Nomination (D-35) 05:00:00 (D-1) 12:59:59
    Output Renomination (D-1) 15:05:00 (D) 01:59:59

    *IP Nomination Lead Time 02:00 hours from nomination*

    Example

    An Input Nomination for flowing energy for Gas Day 13th June 2017 (D) can be placed from 8th May 2017 05:00:00 (D-35) until 12th June 2017 12:59:59 (D-1).

    An Input Renomination for flowing energy for Gas Day 13th June 2017 (D) can be placed from 12th June 2017 15:05:00 (D-1) until 13th June      2017 01:59:59 (D).

  • This is a new process which has been introduced where the estimation of the DM nominations for D+1 gas day will take place. Therefore, to show that the DM nomination has been estimated, the E flag will be showing. If you want to provide a new value to be used you are able to place further nominations.

Measurements/Allocations

  • You are able to request Allocation data using the MTI file. When the Gemini System has received the file, it will get processed and a response will be sent back via an MTO file. The file format can be found on the UK Link Documentation page. Click on the “SharePoint site” link to access.

    Once logged in and loaded, click on folder ’07. Gemini’, Gemini File Formats, Energy Balancing Bulk Uploads and Downloads and choose the document titled “Bulk Download of Pre-Closeout Allocations”.

    If you do not have access to the UK Link Documentation SharePoint site, you will need to fill out and submit a Secure Site Access Form.

  • You are able to request Allocation data using the MTI file. When the Gemini System has received the file, it will get processed and a response will be sent back via an MTO file. The file format can be found on the UK Link Documentation page. Click on the “SharePoint site” link to access.

    Once logged in and loaded, click on folder ’07. Gemini’, Gemini File Formats, Energy Balancing Bulk Uploads and Downloads and choose the document titled “Bulk Download of Pre-Closeout Allocations”.

    If you do not have access to the UK Link Documentation SharePoint site, you will need to fill out and submit a Secure Site Access Form.

File Transfer

  • A step-by-step guide can be found on the Gemini Training page. Once at the page you will need to click on “Gemini e-Training”.

    If you do not have access to Gemini e-Training you will need to request access using the Access Form.

  • The Gemini System will perform validations and will reject any record if there is no matching trade resent within the system, For a Trade Nomination to be confirmed and accepted there must be a matching Nomination by the counter party submitted within the Gemini System.

    If this has occurred then you will need to place a new Nomination for that Gas Day within the Nomination window.

  • Gemini processes files using the generation numbers to ensure that files are loaded in a set order. If you receive this error message, the expected Generation Number  will be specified within the error message and you would need to send the files using the expected number.

    Example:

    If the last file processed in Gemini was with Generation Number – xxxx1, the next expected Generation number is xxxx2, however if Gemini receives the next file as   any other number other than xxxx2, they would all be rejected and not processed in Gemini. If you have a bulk number of files to submit then you need to ensure that the generation numbers are in order e.g. 1, 2, 3, 4 etc.

Capacity

Auctions

  • The field should be left blank.

  • The field should be left blank.

  • No, we do not have an API to place bids.

  • TOT stands for Time Out Trade; if the counter party did not accept the trade in time, the trade will expire and will show the status as TOT. If one of your trades has this status, you will need to re-enter them in the Gemini System.

APIs

  • To access all information regarding APIs that are available within the Gemini System, please visit the Gemini Technical Publications page.

  • New API:

    • View Shipper UIG Values

    Existing API:

    • Shipper Preliminary Balance
    • View Re-nomination Details
    • View Re-nominations
    • View WCF SF Values

    For the description of all the available API’s please follow this link, and open the document ‘Gemini API Specification’

System Access

  • Firstly, check that the system is not within the Gemini Maintenance Window using the table below:

    Day Time
    Monday 3:15am – 4:15am
    Tuesday 3:15am – 4:15am
    Wednesday 3:15am – 4:15am
    Thursday 3:15am – 4:15am
    Friday 3:15am – 4:15am
    Saturday 3:15am – 4:15am
    Sunday 3:00am – 5:00am

    If you are trying to access the Gemini System outside of the Gemini Maintenance window and are unsuccessful, you will need to raise a ticket with the Xoserve Service Desk by emailing servicedesk@xoserve.com.

Unidentified Gas (UIG)

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