Codes
We're administrators for four codes: the Connection and Use of System Code (CUSC), the Grid Code (GC), the System Operator – Transmission Owner Code (STC), and the Security & Quality of Supply Standard (SQSS).
That means we’re here to support those in the industry to propose changes, discuss important issues, and drive key outcomes in the code modification processes. So whether you’re new to the process, or experienced in the way it all works, we’ll help you get to the information you need.
Are you new to codes?
Code changes: Beginner's Guide
Here you can find some simple, easy to digest information to help you if you’re new to our codes.
About the Codes Team
Our team of code administrators oversees all aspects of the code modification processes and related meetings.
Code Administration Code of Practice (CACoP)
The CACoP aims to make the code modification process more transparent and help protect the interests of small market participants.
Energy System Codes
Gas Codes (Uniform Network Code (UNC))
Gas codes are a set of regulations and standards that govern the safe and efficient operation of gas networks.
Connection and Use of System Code (CUSC)
The Connection and Use of System Code is the contractual framework for connecting to and using the National Electricity Transmission System (NETS).
Grid Code (GC)
The Grid Code is the technical code for connection and development of the National Electricity Transmission System (NETS).
System Operator - Transmission Owner Code (STC)
The System Operator – Transmission Owner Code defines the relationship between the transmission system owners and the system operator.
Security and Quality of Supply Standard (SQSS)
The Security and Quality of Supply Standard set out the criteria and methodology for planning and operating the National Electricity Transmission System.
Balancing and Settlement Code (BSC)
The rules and governance arrangements for electricity balancing and settlement in Great Britain.
European Network Codes (ENC)
European network codes cover grid connections, markets, and system operation, providing a sustainable, secure, and competitive electricity market across Europe.
Digitalised Whole System Technical Code (WSTC)
The Whole System Technical Code (WSTC) project proposes to simplify, align, and digitalise GB electricity technical codes.
Search for a code modification
To find any current or concluded code modification, enter its name or ID in the search bar. Once you find the one you're looking for, select it from the drop down list to access the modification's page.
Modification tracker
Our modification tracker gives you the most up-to-date details on on current modifications for each of the four codes.
This includes the purpose of the modification, the stakeholders it affects, panel comments on prioritisation, and where it is in the review process.
We publish the tracker on the 7th of each month, or the following working day if the 7th falls on a non-working day.
Related information
Codes Calendar
Find meeting information and event dates for all codes.
Energy Codes Review
On this page, you can view our latest insights on the BEIS and Ofgem joint Energy Codes Review and keep up to date with developments as the review progresses.
Charging Futures
Charging Futures was set up for electricity network users to learn, contribute and shape the reform of GB's electricity network access and charging arrangements.