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  • Smell Gas? To report a gas or carbon monoxide emergency, or if a pipeline is struck (even if no gas leak has occurred) call the National Gas Emergency Service 24 hours a day on 0800 111 999 (calls are recorded and may be monitored).
  • UK Transmission

  • Our transmission operations in the UK encompass both electricity and gas transmission, comprising the following principal activities: 

    • Electricity transmission owner: We own the electricity transmission system in England and Wales. Our electricity assets comprise approximately 7,200 kilometres of overhead line, about 690 kilometres of underground cable and 337 substations at 241 sites.

      Gas transmission owner: We own the gas national transmission system in Great Britain. This comprises approximately 7,600 kilometres of high pressure pipe and 26 compressor stations, connecting to eight distribution networks and to third party independent systems for onward transportation of gas to end consumers.

      Electricity system operator: We are the Great Britain System Operator, responsible for managing the operations of both the England and Wales transmission system that we own and also the two high voltage electricity transmission networks in Scotland. Day-to-day operation of the Great Britain electricity transmission system involves the continuous real-time matching of demand and generation output, ensuring the stability and security of the power system and the maintenance of satisfactory voltage and frequency. We are also designated as system operator for the new offshore electricity transmission regime.

      Gas system operator: We operate the gas national transmission system. Day-to-day operation includes balancing supply and demand, maintaining satisfactory system pressures and ensuring gas quality standards are met.

      French interconnector: We own and operate the UK assets, and a portion of the subsea cables, that comprise the electricity interconnector between England and France as part of a joint arrangement with the French transmission operator.

      LNG storage: We own and operate liquefied natural gas (LNG) storage facilities in Great Britain.


  • Contacting the Transmission business

    • Contact us if you have an enquiry regarding:

      • Connecting to the transmission network
      • Modification of an existing connection application
      • A diversion of our network as part of your project
      • The commissioning of new connections and power stations
      • Our contracts with other electricity transmission owners (i.e. Scottish Hydro Electricity Transmission Ltd, Scottish Power Transmission Ltd, new offshore transmission operators)
      • Transmission charges for our gas and electricity networks
      • Any other transmission related issue

      Transmission Customer Services manages industry customer relationships. If you have an enquiry regarding any of the above please contact us on 01926 654634.

    • Getting Connected

      For further information about Transmission connections, please visit our Electricity or Gas Connections pages.

    • National Grid House
      Warwick Technology Park
      Gallows Hill
      Warwick
      CV34 6DA

      Call: 01926 65 3000
      Fax: 01926 65 4378

      If you have any UK Operational and NETA related queries, please contact the National Grid IS helpdesk.

  • Steps to take if you spot a potential hazard on or near an overhead electricity line

    Do not approach any hazard, even at ground level. Keep as far away as possible. Follow the six steps below:

    1. Warn anyone in the vicinity to evacuate the area.
    2. Call our 24-hour electricity Emergency Number 0800 40 40 90*.
    3. Give your name and contact phone number.
    4. Explain the nature of the issue/hazard.
    5. Give as much information as possible so that we can identify the geographic location – ie. town/village, numbers of near-by roads, postcode and (ONLY if it can be observed without putting you or others in danger) the tower number of an adjacent pylon.
    6. Await further contact from a National Grid engineer.

    * It is critically important that you don't use this phone number for any other purpose. If you need to contact National Grid for another reason please use our Contact Centre to find the appropriate information.