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
CM095 CM095 - Implementing Connections Reform Current
CM0100 CM0100 - Consequential modification following the approval and implementation of CUSC modification – CMP428 User Commitment liabilities for Onshore Transmission (reinforcement) in the Holistic Network Design Current
PM0141 PM0141 Incorporating a revised outage change code list in STCP 11.2 Appendix 5 Current
CM096 CM096 Application of Gate 2 Criteria to existing contracted background Current
Establishing ISOP in industry codes 2024 Establishing ISOP in industry codes 2024 Current
CM099 CM099 - Removing references to “Fax” and “Facsimile” within the STC Implemented
PM0125 PM0125 - STCP01-1 Amendment to Allow Electronic Switching Instruction Implemented
PM0140 PM0140 - Housekeeping changes following the implementation of PM0135 Implemented
PM0136 - Introducing Connections process to facilitate Competitively Appointed Transmission Owners PM0136 - Introducing Connections process to facilitate Competitively Appointed Transmission Owners Current
PM0135 PM0135: Proposed changes to STCP19-3 to improve the clarity around Compliance responsibilities between the Electricity System Operator and Transmission Owners 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.