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: 18th Oct 2013
  • Decisions
  • 1 Associated documents
GC0071 seeks to introduce governance arrangements into the Grid Code to facilitate the Significant Code Review process following Ofgem’s Code Governance Review Phase 2. 

  • Published: 18th Oct 2013
  • Decisions
  • 1 Associated documents
GC0033 sought to modify the Grid Code to ensure that the benefits afforded to 'Power Park Modules' in the Grid Code are restored to relevant Generators located Offshore and to improve the clarity of the code.

  • Published: 30th Jul 2013
  • Decisions
  • 1 Associated documents
GC0040 seeks to modify the Grid Code to allow National Grid Electricity Transmission to obtain additional information from users to assist it in managing sub-synchronous resonance issues on the electricity transmission network

  • Published: 19th Jul 2013
  • Decisions
  • 1 Associated documents
GC0044 seeks to modify the Grid Code legal text to reflect consequential changes

  • Published: 19th Jun 2013
  • Decisions
  • 1 Associated documents
F/12 seeks to modify the Grid Code to clarify the treatment of the data parameter Two Shifting Limit (TSL) by proposing either to formalise it in the Code or remove it.

  • Published: 14th Mar 2013
  • Other
  • 1 Associated documents
This proposal seeks to modify the Grid Code to clarify which data is to be provided by intermittent generation to participate in the Balancing Mechanism.

  • Published: 16th Jan 2013
  • Other
  • 1 Associated documents
See the Grid Code D/12: Maintenance Standards.

  • Published: 21st Dec 2012
  • Other
  • 1 Associated documents
B/12 seeks to change the Grid Code to formally define Last Time to Cancel Synchronisation as a Dynamic Parameter and retain Station Synchronising Interval and Station De-Synchronising Interval as Other Relevant Data.

  • Published: 23rd Oct 2012
  • Other
  • 1 Associated documents
Grid Code change C/12 allows the option of Earthing before Points of Isolation are established when Gas Insulated Switchgear is used to undertake safety work on the national electricity transmission system.

  • Published: 6th Sep 2012
  • Other
  • 1 Associated documents
B/10 makes changes to the currently specified format in the Operating Code 8 (OC8).

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