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
GC0126 GC0126: Implementing Profiled Stable Import and Export Limits, and reversing unimplemented aspects of GC0068 Concluded
GC0142 GC0142: Adding Non-Standard Voltages to the Grid Code Concluded
GC0028 GC0028: Constant Terminal Voltage Concluded
GC0072 GC0072: Code Governance Review (Phase 2): Code Administrator and Code Administration Code of Practice Concluded
GC0095 GC0095: GB implementation workgroup for Transmission System Operation Guideline TSOG European Network Code Concluded
GC0111 GC0111: Fast Fault Current Injection specification text Concluded
GC0127 GC0127 EU Code Emergency & Restoration: Requirements resulting from System Defence Plan Concluded
GC0143 GC0143: Last resort disconnection of Embedded Generation Concluded
GC0079 GC0079: Frequency Changes during Large Disturbances and their effect on the total system - Phase 1 & 2 Concluded
GC0073 GC0073: Code Governance Review Phase 2 Send Back Process 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.