Grid Code

The Grid Code covers all material technical aspects relating to connections to, and the operation and use of, the national electricity transmission system.

The Grid Code is available to view on the National Grid Electricity Transmission website.

Grid Code Modifications

Our decisions on proposed changes to this code are included below.

Publications and updates

  • Published: 30th Apr 2012
  • Other
  • 1 Associated documents
F/11 sought to implement changes to the Grid Code arising from the due diligence review of the offshore generator build options.

  • Published: 9th Mar 2012
  • Other
  • 1 Associated documents
H/11 would modify the Grid Code to update the reference to the latest issue of the Data Validation, Consistency and Defaulting Rules document in the definition section.

  • Published: 17th Jan 2012
  • Decisions
  • 1 Associated documents
This proposal corrected a number of typographical and formatting errors within the Grid Code document.

  • Published: 25th Oct 2011
  • Other
  • 1 Associated documents
This change will allow National Grid to communicate System Warnings to Users via means other than fax.

  • Published: 10th Oct 2011
  • Other
  • 1 Associated documents
This proposal would change the Grid Code to allow large embedded generators with a network restriction to provide reactive power services (to zero MVAr).

  • Published: 8th Sep 2011
  • Other
  • 1 Associated documents
This proposal sought to modify the Grid Code to clarify the requirements to install an automatic logging device.

  • Published: 5th Aug 2011
  • Decisions
  • 1 Associated documents
This proposal sought to modify Grid Code to align it with the Balancing and Settlement Code following the changes introduced through BSC modification P231.

  • Published: 4th Jul 2011
  • Other
  • 1 Associated documents
This proposal sought to bring the frequency and voltage operating range set out in the Grid Code in line with international standards and tidy up the provisions on frequency and voltage operations range.

  • Published: 20th Dec 2010
  • Other
  • 1 Associated documents
This change to the Grid Code proposes housekeeping amendments that impove the clarity and robustness of the Grid Code legal text.

  • Published: 17th Dec 2010
  • Other
  • 1 Associated documents
See the Grid Code F/10: Code Governance Review - Environmental Assessment.

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