You can raise a modification – or mod – when you want to propose a change to any part of the STC. 

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.

Modification status
ID Name Status Last Updated Sort ascending
PM0106 PM0106: National Grid Legal Separation - consequential changes to STCP19-3 to reference NGESO Implemented
PM0105 PM0105: National Grid Legal Separation - consequential changes to STCP13-2 to reference NGESO Implemented
PM0104 PM0104: National Grid Legal Separation - consequential changes to STCP09-1 to reference NGESO Implemented
PM0103 PM0103: National Grid Legal Separation - consequential changes to STCPs to reference NGESO and SO/TO interface design changes to STCPs Implemented
PM0102 PM0102: National Grid Legal Separation - consequential changes to STCPs to reference NGESO Implemented
CM090 CM090: Housekeeping changes to simplify FSO transition​ Implemented
CM080 CM080: Transmission Impact Assessment Process Implemented
CM077 CM077 - Re-alignment of STC and STCP provisions for Construction Offer Timescales Implemented
CM076 CM076 - STC change to reflect the terms of the UK’s departure from the EU Implemented
CM075 Clarification on TO Final Sums definition 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.

STCP Modification Proposal Form

Download the STCP Proposal form, when we receive your Proposal, we'll check it through and work together to make sure it's easy to understand.

STC Modification Proposal Form

Download the STC Proposal form, 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.