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
GC0160 GC0160 - Grid Code Changes for BSC Mod P448: "Protecting Generators subject to Firm Load Shedding during a Gas Supply Emergency from excessive Imbalance Charges" Concluded
GC0063 GC0063: Power Available Concluded
GC0091 GC0091: Joint GCRP DCRP Workgroup on GB Application of Demand Connection Code Concluded
GC0107 GC0107: The open, transparent, non discriminatory and timely publication of the generic and/ or PGM specific values required to be specified by the relevant TSO(s) and / or relevant system operator et al., in accordance with the RfG Concluded
GC0123 GC0123 Clarifying references to NGET and Relevant Transmission Licensees Concluded
GC0065 GC0065: Consequential Changes from STC Modification CA049 Concluded
GC0092 GC0092: Using National Grid Network Models for Long-term Planning Concluded
GC0108 GC0108: EU Code: Emergency & Restoration: Black start testing requirement Concluded
GC0124 GC0124 Critical Friend review period for submission of new modifications Concluded
GC0140 GC0140: Grid Code Sandbox: enabling derogation from certain obligations to support small-scale trials of innovative propositions Current

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.