Contact us

We aim to respond to all queries within 24 hours, and to reach a resolution - or let you know the next steps we'll take towards one - within 5 days.

The contact details are grouped in a way that will enable you to have your query resolved by the right person as quickly as possible.

Looking for help with the electricity supply in your home?

We don’t supply homes or other domestic properties. If you have a query about your home or non-industrial property, you’ll need to contact your local distribution network operator (DNO). Find out more.

Select your query type from the list below:

Other useful information:

Domestic queries

Select your query from the list on the left

Report a power cut

If you’re experiencing a power cut, call 105 free (lines are open 24 hours a day).

Important:

Do not call your electricity supplier to report a power cut. Your distribution network operator (DNO) maintains the power lines that connect your home or business to our network. When you call 105, you will be put through to your DNO.

Find out more about what to do in a power cut

Report a metering issue

We don’t supply homes or other domestic properties. If you need to report a metering issue relating to your home or another non-industrial property), you’ll need to contact your local distribution network operator (DNO).

Find out how to contact your DNO

Report a power line hazard

If you spot a potential hazard on or near an overhead electricity line please call us urgently on 0800 40 40 90 free (lines are open 24 hours a day).

See more advice for electricity emergencies

"Use of System" charging queries

Select your query from the list on the left

System charges

Need to talk to us about own-bills, forecast costs or the calculation of the billing methodology? Get in touch with the relevant team:

TNUoS queries:

Call: 01926 654633
Email: tnuos.queries@nationalgrideso.com

BSUoS queries:

Call: 01926 654613
Email: bsuos.queries@nationalgrideso.com

For more information about charging, visit our charging page.

Connection charging enquiries

Want to speak to someone about your connection charges and how they are calculated? Get in touch with our team:

Email: transmissionconnectioncharging@nationalgrideso.com

Managing your Connection

Select your query from the list on the left

Connections applications

If you need to talk to someone about connecting your asset, or about an existing connection application, get in touch with our connections team.

Email: transmissionconnections@nationalgrideso.com
Or visit our connections page.

Looking for help with the electricity supply in your home?

We don’t supply homes or other domestic properties. If you have a query about your home or non-industrial property, you’ll need to contact your local distribution network operator (DNO). Find out more.

Balancing services queries

Select your query from the list on the left

Contracts enquiries

If you’re a new balancing services provider or have a query about an existing contract with us, please get in touch with our team:

Call: 01926 654611
Email: commercial.operation@nationalgrideso.com

For more information about balancing services, visit our balancing services page.

Payments and invoices

If you’re an ancillary service provider to National Grid ESO:

Call: 01926 654613
Email: settlement.queries@nationalgrideso.com

If you have a GTMA (Grid Trade Master Agreement) contract with us:

Call: 01926 654613
Email: commodities@nationalgrideso.com

Industry codes managed by the ESO

Select your query from the list on the left

Connection and Use of System Code (CUSC) enquiries

For more information about CUSC, visit our CUSC page.

If you’re interested in becoming a CUSC party, you can find out more by visiting our connections pages.

To contact us directly about the code, please email cusc.team@nationalgrideso.com

Or you can subscribe to the CUSC mailing list.

Grid Code enquiries

For more information about Grid Code, visit our Grid Code pages.

For more information about connecting to the National Electricity Transmission System (NETS), visit our connections pages.

To contact us directly about the code, please email grid.code@nationalgrideso.com

Or you can subscribe to the Grid Code mailing list.

Security and Quality of Supply Standard (SQSS) enquiries

For more information about SQSS, visit our SQSS pages.

To contact us directly about the code, please email box.SQSS@nationalgrideso.com

Or you can subscribe to the SQSS mailing list.

System Operator Transmission Owner Code (STC) enquiries

For more information about STC, visit our STC pages.

To contact us directly about the code, please email stcteam@nationalgrideso.com.

Or you can subscribe to the STC mailing list.

European Network Codes (ENC) enquiries

For more information about ENC, visit our European Network Codes page

To contact us directly about ENC, please email box.europeancodes.electricity@nationalgrideso.com

Accessing system data and publications

Select your query from the list on the left

Request data

Whether you’re looking for Demand data, STOR or Frequency Response data, the ESO Data Portal gives you access to the most up-to-date information available.

Email: box.OpenData.ESO@nationalgrideso.com
Or visit our Data Portal for information about all of our open data.

Our publications

If you have a general question about one of our publications, or something more specific, get in touch with our team.

For more information about our publications, visit our research and publications page.

Our office addresses

National Grid ESO Operational Headquarters – Warwick office

National Grid ESO Head Office Faraday House Hi Res

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

Tel: 01926 654 300

National Grid - Wokingham office

A group of National Grid employees looking at a computer screen with further screens and office space in the background

St Catherine's Lodge
Bearwood Road
Sindlesham
Nr Wokingham
Berkshire, RG41 5BN

Tel: 0118 936 3000

National Grid’s corporate headquarters - London office

Businessman looking out of office over city Getty

This is our registered company address.

1 - 3 Strand
London, WC2N 5EH

Tel: 020 7004 3000

Other queries

Not sure where to direct your query? Get in touch with our Customer and Stakeholder team:

Email: box.eso.complaints@nationalgrideso.com

Make a complaint

We want to know when something goes wrong so we can put things right as quickly as possible.

To make a complaint:

1. Contact the relevant part of the business using the contact details provided on this page.

2. If you’re not able to resolve your complaint using the contact details above, please follow our complaints process.

Our response to coronavirus

Looking for help with the electricity supply in your home?

Domestic queries

Report a power cut

Important:

Report a metering issue

Report a power line hazard

"Use of System" charging queries

System charges

TNUoS queries:

BSUoS queries:

Connection charging enquiries

Managing your Connection

Connections applications

Looking for help with the electricity supply in your home?

Balancing services queries

Contracts enquiries

Payments and invoices

Industry codes managed by the ESO

Connection and Use of System Code (CUSC) enquiries

Grid Code enquiries

Security and Quality of Supply Standard (SQSS) enquiries

System Operator Transmission Owner Code (STC) enquiries

European Network Codes (ENC) enquiries

Accessing system data and publications

Request data

Our publications

Electricity Ten Year Statement (ETYS)

Future Energy Scenarios

Network Options Assessment (NOA)

Winter Review, Winter and Summer Outlook

Our office addresses

National Grid ESO Operational Headquarters – Warwick office

National Grid - Wokingham office

National Grid’s corporate headquarters - London office

Other queries

Make a complaint