On these pages you will find out more about how the National Transmission System (NTS) handles entry and exit capacity, including how to bid for entry capacity and apply for exit capacity. You will also be able to retrieve current and historical capacity data on these pages.

Latest capacity update


Please note that the Enduring Annual Flat Exit Capacity auction (increase & decrease) (EAFLEC) has now been processed.

Please refer to the Gemini Bid Information screen for status updates.


Please note that the Annual Flat Exit Capacity (AFLEC) application has now been processed and all requests allocated.

If you have any questions please contact us on [email protected]


Please note that the Enduring Annual Flat Exit Capacity (increase & decrease) (EAFLEC) and Annual Flat Exit Capacity (AFLEC) application windows have now closed.

For EAFLEC requests (increase or decrease), allocation will take place on or before the 30th September 2021.

For AFLEC requests, allocation will take place on or before 13th August 2021.

For request status updates, please refer to Gemini (Bid Information screen).


Please note that the Long Term Exit application window will open on 1st July 2021. This window will consist of:

  • Enduring annual exit (flat) capacity increase (EAFLEC) – for enduring capacity commencing from Y+4 to Y+6
  • Enduring annual exit (flat) capacity decrease (EAFLEC) – allowing users to reduce capacity from Y+1
  • Annual NTS (flat) exit capacity (AFLEC) – for capacity covering Y+1 to Y+3

For more information, please refer to our Gas Transmission Capacity Guidelines document.


Gemini contingency arrangements

Here you will find guidance on the Gemini Code contingency arrangements should a failure of the Gemini system occur. The processes detailed on here should only be followed when we have declared a Code contingency.

When contingency arrangements are being used, news updates will be provided via the standard communications channels:

For Gemini training materials and operational processes, please go to the Xoserve website. You can find more about Gemini contingency on the Joint Office Website.

Processes to be followed and proforma to be used in the event of a Gemini Code contingency are located here:

Download the Gemini Code Contingency Guidelines document



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To find out more about charges and how those charges are determined, please refer to the Charging pages.

Find out more