We are becoming a separate company

In April 2019, the Electricity System Operator is becoming a separate company within the National Grid Group. Find out more about what this change will mean.

System Operator Transmission Owner Code

The System Operator Transmission Owner Code (STC) defines the relationship between the transmission system owners and the system operator.

Calendar key

  • Authority decision
  • Consultation
  • Implementation
  • Meeting
  • Panel meeting
  • Stakeholder event
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