System Operator Transmission Owner Code (STC)
The System Operator Transmission Owner Code defines the relationship between the transmission system owners and the system operator.
As the code administrator for the STC, we maintain the code and oversee any proposed changes to it. All changes have to be reviewed by the STC modification Panel and approved by the Panel, or by Ofgem.
You can find out more about the roles and responsibilities of everyone involved in the STC procedures document, on the Code documents page.
For more information about the code, please contact [email protected]
You can subscribe to the STC mailing list here.
STC Code Documents
All documents relating to the STC are available here to download. Including the latest version of the code itself, in full, and details of any revisions.
STC Modifications
Here you can search for any current or concluded modifications as well as raising a modification when you want to propose a change to any part of the STC.
STC Panel
The STC modification panel is made up of a panel chair and a panel technical secretary, as well as members of NESO, offshore and onshore transmission licensees, and an authority representative.…
Transmission Charging Review group (TCRG)
The STC Transmission Charging Review group TCRG) reviews transmission owner charging methodologies and how they affect end users.
Modification Tracker
Our Modification Tracker gives you the very latest detail on current modifications for each of the four codes. It includes the purpose of the modification and the stakeholders it affects, as well as Panel comments on prioritisation, and where it is in the review process.
This Modification Tracker will be published on a monthly basis on the 7th calendar day of the month or the next working day where the 7th is a non-working day.