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: 26th Jul 2012
  • Other
  • 1 Associated documents
This proposal would include in the Grid Code generator compliance requirements currently set out in guidance notes to assist National Grid Electricity Transmission plan and operate the transmission system.

  • Published: 22nd May 2012
  • Other
  • 1 Associated documents
D/11 amends the Grid Code to reflect that System to Generator Operational Intertripping Schemes apply in the case of the circuit breakers of relevant transmission licensees as well as those of users.

  • 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.

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