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.

Security and Quality of Supply Standards

The Security and Quality of Supply Standards set out criteria and the methodology for planning and operating the National Electricity Transmission System (NETS).

ID Name Status Last updated Sort ascending
GSR025 GSR025: Updating the SQSS to reflect the recent modification to Engineering Recommendation P28 Current 25 Sep 2018
GSR023 GSR023: Clarification of the N-1-1 Requirements and minor housekeeping change Current 25 Sep 2018
GRS024 GRS024: National Grid Legal Separation Changes Current 25 Sep 2018
GSR015 GSR015: Normal Infeed Loss Risk Concluded 25 Sep 2018
GSR016 GSR016: Small and Medium Embedded Generation Assumptions Current 25 Sep 2018
GSR017 GSR017: Treatment of Switch Faults in Operational Timescales Concluded 25 Sep 2018
GSR018 GSR018: Treatment of Sub-Synchronous Oscillations SSO in the NETS SQSS Concluded 25 Sep 2018
GSR019 GSR019: Review of Chapter 7 Double Busbar Requirements Concluded 25 Sep 2018
GSR020 GSR020: Modification of Clause 7.8.1.1 to Allow Single Transformer Offshore Substations of Capacity Greater Than 90MW Concluded 25 Sep 2018
GSR021 GSR021: Operational and Planning Criteria for 220kV Transmission Assets Concluded 25 Sep 2018