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 Mar 2009
  • Other
  • 1 Associated documents
This is the clarification of data requirement for functioning of the transmission system.

  • Published: 3rd Mar 2009
  • Other
  • 1 Associated documents
See the Grid Code changes to clarify the technical requirements that may be specified in a generator's bilateral agreement as part of a system to generator operational intertripping scheme requirement.

  • Published: 20th Nov 2008
  • Decisions
  • 1 Associated documents
See the decision letter for D/08 "Grid Code Requirements for Technical performance".

  • Published: 30th Sep 2008
  • Decisions
  • 1 Associated documents
See the Grid Code decision letter C08 "Data Exchange".

  • Published: 18th Sep 2008
  • Other
  • 1 Associated documents
Grid Code decision letter sent out 18 Sept 08.

  • Published: 22nd Aug 2008
  • Other
  • 1 Associated documents
See the decision letter for B/08 Grid Code Requirements for Power park Modules - Voltage Control and Reactive power - sent out 22.8.08.

  • Published: 1st Jul 2008
  • Other
  • 1 Associated documents
See the processes to restart Transmission system following system shut down - decision letter.

  • Published: 13th Jun 2008
  • Other
  • 1 Associated documents
Emergency Instruction to Emergency De-Energise - A/08 Decision Letter issued 13 June 2008.

  • Published: 28th Mar 2008
  • Other
  • 1 Associated documents
See the F07 Grid Code Requirements for Current Sourced DC Links - decision letter.

  • Published: 25th Mar 2008
  • Other
  • 1 Associated documents
See the Power Park Modules and Synchronous Generating Units Grid Code G06 Decision Letter.

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