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.

ID Name Status Last updated Sort ascending
PM0106 National Grid Legal Separation - consequential changes to STCP19-3 to reference NGESO Current 25 Sep 2018
PM0105 National Grid Legal Separation - consequential changes to STCP13-2 to reference NGESO Current 25 Sep 2018
PM0104 National Grid Legal Separation - consequential changes to STCP09-1 to reference NGESO Current 25 Sep 2018
CM069 National Grid Legal Separation - consequential changes to incorporate NGESO in STC Sections & Schedules Current 25 Sep 2018
CM068 National Grid Legal Separation - consequential changes to reference NGESO in STC Section D and to provide clarity that only Transmission Owners create Transmission Investment Plans Current 25 Sep 2018
CM067 National Grid Legal Separation - consequential changes to reference NGESO into STC Section B and changes to STC Modification Panel membership to add NGESO as Member Current 25 Sep 2018
CM066 National Grid Legal Separation - consequential changes to reference NGESO in STC Section G and to place Nuclear Site Licence Provisions Agreement obligations on NGET for England and Wales Current 25 Sep 2018
CM065 National Grid Legal Separation - consequential changes to reference NGESO in STC Section C and changes to Outage Planning Data Timescales Current 25 Sep 2018
PM0103 National Grid Legal Separation - consequential changes to STCPs to reference NGESO and SO/TO interface design changes to STCPs Current 25 Sep 2018
PM0102 National Grid Legal Separation - consequential changes to STCPs to reference NGESO Current 25 Sep 2018