Our response to coronavirus

Find out how we're working to keep the electricity and gas flowing reliably throughout the outbreak.

Maintaining your connection

When your asset has become operational, you will need to comply with operational Grid Code requirements.

These include coordinated outage planning for work on our transmission assets; and providing regular technical data updates.

Through the life of your connection you will pay ongoing use of system costs to the ESO, which cover the costs of maintaining the transmission network and day-to-day costs of balancing the energy system. You may also continue to pay for your connection assets, depending on the payment option you select.

During the life of your connection you might plan to modify or re-plant your connection equipment. The size and nature of this modification may mean it requires a modification application, which you can submit to the Electricity System Operator (ESO).

Due to the COVID-19 pandemic you may have uncertainties about your connection application or are considering modifying your application. Please take a look at our Frequently Asked Questions to assist you with any concerns you may have.

Customer checklist

  • Are you aware of the compliance requirements post-commissioning under the Grid Code?
  • Are you aware of your ongoing transmission charges?
  • Have you told your account manager about modifications to your plant?

If you have answered no to any of these questions, please make an enquiry, we’re here to help.

Stage 7 of the connection process

Go to the next stage, concluding your connection.

Supporting information


Have you got a question about this stage?

Go to FAQs

Connections application guide

If you’re applying to connect to the transmission system in England and Wales, then our handy guide will help you complete your National Grid ESO application form.

Download guide


Modify your asset by submitting a modification application and payment of the application fee.

Find out more

How much does it cost?

You can find out about all the costs involved in each of the application stages by visiting this page.

Find out more