Grid Code Modifications
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.
| ID | Name | Status | Last Updated Sort ascending | Link to modification |
|---|---|---|---|---|
| GC0101 | GC0101: EU Connection Codes GB Implementation – Mod 2 | Implemented | view | |
| GC0100 | GC0100: EU Connection Codes GB Implementation – Mod 1 | Implemented | view | |
| GC0097 | GC0097: Grid Code Processes Supporting TERRE | Implemented | view | |
| GC0163 | GC0163: GB Grid Forming (GBGF) - Removal of Virtual Impedance restriction | Implemented | view | |
| GC0170 | GC0170: Typographical and formatting updates following the implementation of GC0156: Facilitating the Implementation of the Electricity System Restoration Standard | Implemented | view | |
| GC0022 | GC0022: Frequency Response | Concluded | view | |
| GC0023 | GC0023: Protection Fault Clearance Times and Back-up Protection | Concluded | view | |
| GC0028 | GC0028: Constant Terminal Voltage | Concluded | view | |
| GC0079 | GC0079: Frequency Changes during Large Disturbances and their effect on the total system - Phase 1 & 2 | Concluded | view | |
| GC0036 | GC0036: Review of Harmonics Assessment Standards and Processes | Concluded | view |
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.
Raise a modification
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.