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
GC0135 GC0135 - Removal of Redundant Provisions Concluded
GC0151 GC0151: Grid Code Compliance with Fault Ride Through Requirements Concluded
GC0052 GC0052: Assigning Detailed Planning Data DPD References Concluded
GC0087 GC0087: Requirements for Generators Frequency Provisions Concluded
GC0104 GC0104: EU Connection Codes GB Implementation – Demand Connection Code Concluded
GC0120 GC0120 - National Grid legal separation changes to clarify Grid Code responsibilities and consequential changes Concluded
GC0136 GC0136: Non-material changes to the Grid Code following implementation of the EU Connection Codes Concluded
GC0152 GC0152: Updating the Grid Code governance process to ensure we capture network code on electricity emergency and restoration (NCER) change process for Article 4 Terms and Conditions (T&Cs) Concluded
GC0061 GC0061: Amendments Required to Implement the Electricity Supply Emergency Code ESEC Concluded
GC0088 GC0088: Voltage Unbalance 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.