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  • Capacity

    • Capacity gives shippers the entitlement to flow gas on and off the National Transmission System (NTS), and so capacity is often also referred to as ‘rights’ or ‘entitlements’. A shipper needs to buy 1 unit of capacity in order to flow 1 unit of energy on or off the system. This is known as the ‘ticket to ride’ principle. Units for both capacity and energy are in kWh/day
    • Latest Capacity Updates

      The Enduring Annual (Flat) Exit Capacity (EAFLEC) and the Annual (Flat) Exit Capacity (AFLEC) letter has now been sent out to all shippers. The EAFLEC reduction window will be open between 1st and 15th July 2017 on business days only. The EAFLEC increase window and the AFLEC window will be open each business day through out July 2017

    •  Contact us Contact us for further information on Capacity;

      call on +44 (0) 1926 654057

      or email us.

  • Entry Capacity

    • Entry Capacity Entry Capacity 

      Information regarding the Entry Capacity regime as well as all available Entry Capacity Auction details

      If Entry Capacity reports are required, please click the 'Entry Capacity Auction Publications' link

  • Exit Capacity

    • Exit Capacity Exit Capacity

      Information regarding the Exit Capacity regime along with all available Exit Capacity auctions details.

      If Exit Capacity reports are required, please click the 'Exit Capacity Auction Publications' link

  • Exit Capacity Documents


    In accordance with Mod0195AV that introduced long, medium and short term sales of NTS Exit Flat capacity through application and auction based mechanisms, the following documents provide details of transitional exit capacity from 01 October 2008 to 30 September 2012.

  • Summary of Exit Capacity

    27 Jun 2013
    Transitional Exit Data Publication Sep12
    148 KB

    03 Jul 2013
    Summary of Transitional Incremental Exit Capacity
    86 KB

  • Gemini Contingency Arrangements

    • AttentionGemini Contingency Arrangements

      The Gemini System and Contingency arrangements page provides guidance on the Gemini Code Contingency arrangements including the contingency proformas.

  • Constraint Management

    • Balancing servicesConstraint Management

      This page provides a list of NTS Exit Zones and further material regarding localised system management tools.

  • Useful Links