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 Sort ascending
GC0112 GC0112: National Grid Legal Separation Grid Code changes to incorporate NGESO Concluded
GC0128 GC0128 EU Code Emergency & Restoration: Requirements resulting from System Restoration Plan Concluded
GC0145 GC0145: Updating the Grid Code to include the Manually Activated Reserve Initiative (MARI) Concluded
GC0036 GC0036: Review of Harmonics Assessment Standards and Processes Concluded
GC0074 GC0074: GCRP Membership Concluded
GC0097 GC0097: Grid Code Processes Supporting TERRE Concluded
GC0113 GC0113: The open, transparent, non-discriminatory and timely publication of the generic and user specific values required to be specified by the relevant TSO(s) and / or relevant system operator et al., in accordance with the DCC Concluded
GC0129 GC0129 - Updating the Grid Code to use Engineering Recommendation G5/5 - Harmonics Concluded
GC0144 GC0144: Alignment of Market Suspension Rights to the EU Emergency and Restoration Code Article 35.1(b) Concluded
GC0161 GC0161: Changes to OC6 to allow for site protection 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.