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  • Balancing the National Transmission System (NTS)

  • National Grid Transmission in its role as System Operator and NTS shippers are incentivised to balance NTS inputs and outputs on a daily basis.
  • The Role of National Grid

  • National Grid have a responsibility to keep the physical system within safe operating limits. This includes acting as residual balancer - taking energy balancing trades on the On The Day Commodity Market (OCM) to influence the matching of supply and demand. For further details on system balancing please see the following links:
    Additional information for users regarding some of these tools, processes and other information relating to NTS balancing is available via the links on this page. 
    • The Role of Shippers

    • Under the Uniform Network Code (UNC), Shippers are incentivised to balance their system inputs and outputs and make accurate nominations using the Gemini system.

      Financial Energy Balancing charges, invoiced via Xoserve, may be incurred if Shippers are unable to balance their portfolio by the end of the gas day. 

      The summary document provides an overview of the Energy Balancing Charges: Scheduling and Imbalance Charges  

    • Prevailing viewOperational Data

      Access the latest operational data including real time flow data.  

  • Gas connectionsGas Deficit Warnings & Margins Notices


    These notices and warnings, issued by National Grid NTS, provide information regarding risks to the end of day NTS physical system balance.

     More information   

  • Balancing servicesOperating Margins

    Operating Margins gas would typically be used to maintain NTS system pressures before other balancing measures become effective, in situations where not meeting safe operating pressure could be a concern. This page provides further information including details of the tender process. 

     More information

  • NTS Gas connectionsNTS Exit Zones & Constraint Management


    System management actions may be taken at NTS Exit Zone level. Details of Exit Zones and information regarding NTS Constraint Actions including process overviews are available here.

    More information  

  • Our networks Unaccounted For Gas  


    National Grid Gas, in its role as System Operator for the NTS has a role in the identification and management of Unaccounted For Gas. This information is aimed at all those in the gas community with an interest in Unaccounted for Gas (UAG).                         

     More Information

  • LNG StorageSafety Monitors  

    Safety Monitors define levels of storage space and deliverability that must be maintained through the Gas winter period. The focus of the Safety Monitors is public safety rather than security of supply. They provide a trigger mechanism for taking direct action to avoid a potential gas supply emergency.

     More Information

  • NTS Emergency Arrangements

  • A Network Gas Supply Emergency (NGSE)  may be caused by unforeseen circumstances such as pipeline or equipment failure, or where system demand exceeds either total supply or planned system capacity. 

    Further information regarding NTS Emergency Arrangements and the processes relating to Emergency Curtailment Quantities (ECQ), Storage Curtailment Compensation Arrangements and Post Emergency Claims are accessible via these pages

    Please note these details relate to NTS Network Gas Supply Emergencies only and do not cover local emergencies, which will be managed by the relevant Distribution Network.


     Attention   If you smell gas, or need to report a gas escape please call 0800 111 999.