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Codes Homepage
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Our response to coronavirus
Find out how we're working to keep the lights on in Great Britain throughout COVID-19.
ESO
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.
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)
Contact us for the following:
- Data and reports
- Forecast volumes and costs
- Transmission licence C16
- Transmission operational forum
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.
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.
Address
National Grid ESO
Faraday House
Warwick Technology Park
Gallows Hill
Warwick, CV34 6DA
Tel: +44 (0) 1926 65 3000
Wokingham
Address
St Catherines Lodge
Bearwood Road
Sindlesham
Nr Wokingham
Berkshire, RG41 5BN
Tel: +44 (0) 118 936 3000
The Strand - London
This is our registered company address.
Address
1 - 3 Strand
London, WC2N 5EH
Tel: +44 (0) 20 7004 3000