Our response to coronavirus

Find out how we're working to keep Great Britain’s lights on reliably throughout the outbreak.

Contact us

If you have a question for us, want to find out where we are located, or have a complaint then you're in the right place.

Balancing services

Contact us for the following:

  • Balancing (ancillary) services queries
  • Contracts
  • Settlements and payments

Contact us for the following:

TNUoS enquiries (Transmission Network Use of System)

  • TNUoS charges 
  • AAHEDC charges (Assistance for Areas with High Electricity Distribution Costs)
  • TNUoS / BSUoS credit
  • How charges are calculated
  • Triad periods

BSUoS enquiries (Balancing Services Use of System)

  • BSUoS payments
  • BSUoS forecasting
  • How charges are calculated

Connection charging enquiries

  • Connection charges
  • Appendix A, B, D or B1 of your connection agreement
  • How charges are calculated

Charging Review

  • To get involved in charging reviews and forums

Contact us about the following:

  • CUSC and modifications
  • Grid Code and modifications
  • SQSS and modifications
  • STC and modifications
  • European network codes
  • Balancing frameworks

Contact us for the following:

  • Connecting to the transmission network
  • Modification of an existing connection application
  • 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)
Data and operations

Contact us for the following:

  • Data and reports
  • Forecast volumes and costs
  • Transmission licence C16
  • Transmission operational forum
ESO query directory

To help you efficiently find the right person to talk to in the Electricity System Operator, we have developed the following contact list and directory. We have based it on the most common queries we receive from our customers. Its purpose is to make finding the right subject matter expert within National Grid quicker and easier.

Please note that if your question relates to a domestic electricity connection, please contact your network operator. You can find out who your network operator is on the Energy Networks Association website. If your question is billing-related, then please contact your electricity supplier.

Download the Electricity Contact list

A trains passes between buildings in Manchester

Electricity emergencies and safety advice

If you spot a potential hazard on or near an overhead electricity line please call us urgently on 0800 40 40 90.

Find out more

National Grid representative sitting at a desk in front of a computer with an out of focus office in the background


We want to know when something goes wrong so we can sort it out as quickly as possible. Please contact the relevant part of the business and they will work to put it right.

Find out more

If you experience issues with access to our IT systems please call us on 0800 917 7111.

Our locations

Warwick - Headquarters

National Grid House is our operational headquarters. 


National Grid ESO
Faraday House
Warwick Technology Park
Gallows Hill
Warwick, CV34 6DA

Tel: +44 (0) 1926 65 3000




St Catherines Lodge
Bearwood Road
Nr Wokingham
Berkshire, RG41 5BN

Tel: +44 (0) 118 936 3000


The Strand - London

This is our registered company address.


1 - 3 Strand
London, WC2N 5EH

Tel: +44 (0) 20 7004 3000