Contact us

Contact us about the industry codes managed by NESO.

Find out more about codes

Connection and Use of System (CUSC)

Email: [email protected]

Grid Code (GC)

Email: [email protected]

Security and Quality of Supply Standard (SQSS)

Email: [email protected]

System Operator Transmission Owner Code (STC) 

Email: [email protected]

European Network Codes (ENC) 

Email: [email protected]

Find out how to contact us about system and connection charges, including own-bills, forecast costs, or billing methodology calculations.

Transmission Network Use of System (TNUoS) charges

Email: [email protected]

Balancing Services Use of System (BSUoS) charges

Email: [email protected]

Connection charging enquiries

Get in touch if you need help with connection charges and how they are calculated.

Email: [email protected]

Get in touch with our connections team to talk to us about connecting your asset or about an existing connection application.

Email: [email protected]

Find out more about connections

If you’re experiencing an energy outage, call 105 free (lines are open 24 hours a day).

Do not call your electricity supplier to report a power cut. Your 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. 

What to do in an energy outage

Our Connections Portal has been designed to transform all customers' connections journey and account management. The portal has digitised the application process and includes the following high-level functionality:

• Apply for connections and other agreements online.
• Monitor live applications and track progress.
• Access to signed contract documents.
• View key milestones/ milestone management.
• Communicate directly with your Connections contract manager.

Access the Connections Portal

If you have a general question about one of our publications or something more specific, contact our team:

Electricity Ten Year Statement (ETYS)

Find more information about Electricity Ten Year Statement
Email: [email protected]

Future Energy Scenarios

Find more information about Future Energy Scenarios
Email: [email protected]

Network Options Assessment (NOA)

Find more information about Network Options Assessment
Email: [email protected]

Winter Review, Winter and Summer Outlook

Find more information about Winter outlook
Email: [email protected]

For more information about our publications, explore our publications library.

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

If you smell gas or suspect a leak, Call 0800 111 999 * (24 hours a day – free to call).

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 immediately on 0800 111 999 or via textphone (minicom) on 0800 371 787.

While National Gas is responsible for the gas National Transmission System, these emergency guidelines apply to all gas users.

To report a metering issue relating to your home or another non-industrial property), contact your local DNO.

Find your local DNO

For more information or queries on NESO’s Data Sharing Approach please email us.

Email: [email protected]

Or visit our Data Portal for information about all of our open data.

We’re committed to providing you with excellent service – first time, every time. We know that on occasions things can go wrong and we want to resolve any problems as quickly as possible and learn from any mistakes. If you would like to escalate your feedback please email us on [email protected].