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
Modification status
ID Name Status Last Updated
GC0105 GC0105: System Incidents Reporting Implemented
GC0104 GC0104: EU Connection Codes GB Implementation – Demand Connection Code Implemented
GC0102 GC0102: EU Connection Codes GB Implementation – Mod 3 Implemented
GC0101 GC0101: EU Connection Codes GB Implementation – Mod 2 Implemented
GC0100 GC0100: EU Connection Codes GB Implementation – Mod 1 Implemented
GC0103 GC0103: The introduction of harmonised Applicable Electrical Standards in GB to ensure compliance with the EU Connection Codes Current
GC0095 GC0095: GB implementation workgroup for Transmission System Operation Guideline TSOG European Network Code Concluded
GC0048 GC0048: Joint GCRP DCRP Workgroup on GB Application of RfG Concluded
GC0097 GC0097: Grid Code Processes Supporting TERRE Implemented
GC0036 GC0036: Review of Harmonics Assessment Standards and Processes 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.