You can raise a modification – or mod – when you want to propose a change to any part of the Grid Code. 

For more information, please contact [email protected]

Search for any current or concluded modifications by name or ID. You can sort mods by ID, name, status or date of update. Or filter according to status.

Views reference
ID Name Status Last Updated Sort ascending
GC0022 GC0022: Frequency Response Concluded
GC0068 GC0068: Grid Code New and Revised Unit Data and Instructions Concluded
GC0093 GC0093: Assessment of System Warnings Concluded
GC0109 GC0109: Publication of the various GB electricity Warnings or Notices or Alerts or Declarations or Instructions or Directions etc. (“System Warning Alerts”) issued by or to the Network Operator(s). Concluded
GC0125 GC0125 EU Code Emergency & Restoration: Black Start testing requirements for Interconnectors Concluded
GC0157 GC0157: Grid Code Housekeeping modification Concluded
GC0023 GC0023: Protection Fault Clearance Times and Back-up Protection Concluded
GC0071 GC0071: Code Governance Review Phase 2 Code Administrator and Code Administration Code of Practice Concluded
GC0094 GC0094: Relevant Electrical Standards RES Updates Concluded
GC0110 GC0110: LFSM-O compliance requirements for Type As and B PGMs Concluded

More about modifications

Modification Tracker

Our Tracker gives you the latest details on current code modifications including the purpose and the stakeholders it affects, as well as panel comments and where it is in the review process. It is published on the 7th (or next working day) of each month.

Modification Proposal Form

If you're thinking about raising a modification, please get in touch with us. Our experts can give you advice on your Proposal, explain how the modification process works and help to answer any questions you may have. When we receive your Proposal, we'll check it through and work together to make sure it's easy to understand.

Calendar

Once you've been in touch and are ready to write your Proposal paper, send it to us by the monthly modification submission date which you can find on our Calendar.