System Operator – Transmission Owner Code (STC)

The System Operator – Transmission Owner Code (STC) defines the high-level relationship between the national electricity transmission system operator, National Grid Electricity Transmission plc (NGET), and onshore and offshore transmission owners.

The STC includes arrangements for:

  • transmission owners to make transmission services available to NGET for its use so it can discharge its obligations under its Licence and the user facing Codes (CUSC, BSC, Grid Code etc)
  • the planning of transmission outages and co-ordination of investment planning for the development of the transmission system (including new connections to the system).

If you wish to discuss whether you need to be a party to this code and, if so, how to become one, please contact National Grid Electricity Transmission plc.

 

System Operator–Transmission Owner Code Modifications

Our decisions on proposed changes to this code are included below.

Publications and updates

  • Published: 6th Dec 2018
  • Decisions
  • 1 Associated documents
We have approved these modifications to the System Operator - Transmission Owner (STC).

  • Published: 26th Nov 2014
  • Decisions
  • 1 Associated documents
We have approved this modification to the System Operator - Transmission Owner Code (STC).

  • Published: 27th Jun 2014
  • Decisions
  • 1 Associated documents
CM0055 seeks to modify the System Operator-Transmission Owner Code (STC) to reflect Third Package licence changes.

  • Published: 6th Nov 2013
  • Decisions
  • 1 Associated documents
CM053 seeks to introduce the send back process for modifications into STC governance in line with our licence changes for Code Governance Review Phase 2 (CGR Phase 2). 

  • Published: 6th Nov 2013
  • Decisions
  • 1 Associated documents
CM052 seeks to reflect Code Administrator and Code Administrator Code of Practice (CACoP) obligations in STC governance in line with our licence changes for Code Governance Review Phase 2 (CGR Phase 2). 

  • Published: 6th Nov 2013
  • Decisions
  • 1 Associated documents
CM054 seeks to introduce the ‘fast track’ self-governance process into STC governance in line with our licence changes for Code Governance Review Phase 2 (CGR Phase 2).  

  • Published: 6th Nov 2013
  • Decisions
  • 1 Associated documents
CM050 seeks to introduce the self-governance process into STC governance in line with our licence changes for Code Governance Review Phase 2 (CGR Phase 2). 

  • Published: 6th Nov 2013
  • Decisions
  • 1 Associated documents
CM051 seeks to introduce the Significant Code Review (SCR) process into STC governance in line with our licence changes for Code Governance Review Phase 2 (CGR Phase 2). 

  • Published: 11th Mar 2013
  • Other
  • 1 Associated documents
CA046 seeks to modify the STC to implement offshore generator build and facilitate arrangements for the transfer of the generator build transmission assets to an Offshore Transmission Owner (OFTO).

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