Security and Quality of Supply Standard (SQSS)

Transmission licensees – both onshore and offshore – are required by their licences to comply with the National Electricity Transmission System Security and Quality of Supply Standards (NETS SQSS), which sets out criteria and methodologies for planning and operating the GB Transmission System.

The SQSS Panel is responsible for keeping the standard under review and submitting any proposed changes to us for a decision.

In certain circumstances Ofgem may grant a derogation from the obligation to comply aspects of the NETS SQSS. Under the Connect and Manage process (which allows generation to connect before wider works to the transmission system have been completed) National Grid Electricity Transmission (as System Operator) also has the power to grant certain derogations.

Publications and updates

  • Published: 21st Mar 2019
  • Decisions
  • 1 Associated documents
Decision to change the standard licence conditions to reflect the latest version number of the NETS SQSS, V2.4, and to correct an error in a definition.

  • Published: 4th Jan 2019
  • Closed: 1st Feb 2019
  • Consultations and responses
  • 3 Associated documents
Changes to the standard licence conditions to reflect the latest version number of the NETS SQSS, V2.4, and to correct an error in a definition.

  • Published: 2nd Jan 2019
  • Decisions
  • 1 Associated documents
See the modification proposal GSR024: National Grid Legal Separation SQSS Changes.

  • Published: 2nd Jan 2019
  • Decisions
  • 1 Associated documents
See the modification proposal GSR023: Clarification of the applicability of the N-1-1 Criterion.

  • Published: 25th May 2018
  • Decisions
  • 1 Associated documents
Authority decision to approve NETS SQSS modification GSR016.

  • Published: 16th Feb 2018
  • Closed: 19th Mar 2018
  • Change proposal, Consultations and responses
  • 1 Associated documents
Changes to the standard licence conditions to reflect the latest version number of the NETS SQSS (V2.4)

  • Published: 12th Dec 2016
  • Decisions
  • 1 Associated documents
Standard licence conditions to be changed to reflect the latest version number of the NETS SQSS (V2.3).

  • Published: 12th Oct 2016
  • Closed: 16th Nov 2016
  • Consultations and responses
  • 2 Associated documents
Changes to the standard licence conditions to reflect the latest version number of the NETS SQSS (V2.3).

  • Published: 4th Jul 2016
  • Decisions
  • 1 Associated documents
GSR0021 proposed changes to accommodate 220kV voltages. We have not approved this modification to Chapter 6 of the SQSS.

  • Published: 4th Jul 2016
  • Decisions
  • 1 Associated documents
We have approved the modification (GSR0011) to the SQSS that implements changes to Chapter 7 (Offshore Transmission network) and Chapter 11 (Terms and Definitions).

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