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.

Grid Code

The Grid Code is the technical code for connection and development of the National Electricity Transmission System (NETS).

ID Name Status Last updated Sort ascending
GC0108 GC0108: EU Code: Emergency & Restoration: Black start testing requirement Current 11 Oct 2018
GC0118 GC0118: Modification to the Grid Code to accommodate the recent Distribution Code modification to Engineering Recommendation P28 –Voltage fluctuations and the connection of disturbing equipment to transmission systems and distribution networks in the UK Current 11 Oct 2018
GC0112 GC0112: National Grid Legal Separation Grid Code changes to incorporate NGESO Current 25 Sep 2018
GC0106 GC0106: Data exchange requirements in accordance with Regulation (EU) 2017/1485 (SOGL) Current 25 Sep 2018
GC0097 GC0097: Grid Code Processes Supporting TERRE Current 25 Sep 2018
GC0104 GC0104: EU Connection Codes GB Implementation – Demand Connection Code Current 25 Sep 2018
GC0111 GC0111: Fast Fault Current Injection specification text Current 25 Sep 2018
GC0109 GC0109: The open, transparent, non discriminatory and timely publication of the various GB electricity Warnings or Notices or Alerts or Declarations or Instructions or Directions etc., issued by or to the Network Operator(s) Current 25 Sep 2018
GC0110 GC0110: LFSM-O compliance requirements for Type As and B PGMs Current 25 Sep 2018
GC0096 GC0096: Energy Storage Current 25 Sep 2018