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 | |
|---|---|---|---|---|
| GC0128 | GC0128 EU Code Emergency & Restoration: Requirements resulting from System Restoration Plan | Implemented | ||
| GC0127 | GC0127 EU Code Emergency & Restoration: Requirements resulting from System Defence Plan | Implemented | ||
| GC0125 | GC0125 EU Code Emergency & Restoration: Black Start testing requirements for Interconnectors | Implemented | ||
| GC0123 | GC0123 Clarifying references to NGET and Relevant Transmission Licensees | Implemented | ||
| GC0124 | GC0124 Critical Friend review period for submission of new modifications | Implemented | ||
| GC0111 | GC0111: Fast Fault Current Injection specification text | Implemented | ||
| GC0118 | GC0118: Modification to the Grid Code to accommodate the recent Distribution Code modification to Engineering Recommendation P28 –Voltage fluctuations and the connection of disturbing equipment to transmission systems and distribution networks in the UK | Implemented | ||
| GC0114 | GC0114: System Operation Guideline: Prequalification Processes | Implemented | ||
| GC0122 | GC0122 - Amending references to NGET and the Company within the Grid Code following previous modifications | Implemented | ||
| GC0120 | GC0120 - National Grid legal separation changes to clarify Grid Code responsibilities and consequential changes | Implemented |
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.