Connection and Use of System Code (CUSC)

The Connection and Use of System Code (CUSC) constitutes the contractual framework for connection to, and use of, the national electricity transmission system.

The methodologies used to derive the charges that National Grid Electricity Transmission levies for connection to and use of the national electricity transmission system are also set out in the CUSC.

If you wish to discuss whether you need to be a party to this code and how to become one, please contact National Grid Electricity Transmission plc.

Connection and Use of System Code Modifications

Our decisions on proposed changes to this code are included below.

Publications and updates

  • Published: 30th Mar 2012
  • Other
  • 1 Associated documents
CMP192 would modify the Connection and Use of System Code (CUSC) to include new arrangements for calculating user commitment liabilites, and associated securities, for both pre- and post-commissioning generators.

  • Published: 13th Feb 2012
  • Closed: 12th Mar 2012
  • Consultations and responses
  • 23 Associated documents
This document presents, for consultation, our assessment of the impacts of CMP 192 and our developing thinking.

  • Published: 17th Jan 2012
  • Decisions
  • 1 Associated documents
CMP198 would modify the Connection and Use of System Code (CUSC) to provide a proposer of a CUSC modification with more ownership of the proposal prior to the Code Administrator Consultation.

  • Published: 16th Jan 2012
  • Other
  • 1 Associated documents
This modification clarifies the role and responsibliilites of relevant parties with respect to gas insulated switchgear at sub-stations.

  • Published: 15th Dec 2011
  • Other
  • 1 Associated documents
This proposal sought to remove the restriction on entities without an Approved Credit Rating providing a financial guarantee, enabling this to be provided by way of an Independent Credit Assessment.

  • Published: 15th Dec 2011
  • Other
  • 1 Associated documents
This proposal would align the CUSC with the Grid Code to allow payments to generators which provide reactive power services to National Grid in line with the new definition Reactive Despatch to Zero MVAr Network Restriction.

  • Published: 13th Dec 2011
  • Other
  • 1 Associated documents
This proposal sought to require a two-thirds majority for a Panel recommendation on any CUSC change arising from licence obligations, an Authority request or obligation.

  • Published: 18th Nov 2011
  • Other
  • 1 Associated documents
This proposal sought to provide clarification to the CUSC legal text after the implementation of the Codes Governance Review.

  • Published: 15th Nov 2011
  • Consultations and responses
  • 1 Associated documents
This proposal would oblige NGET to undertake stakeholder engagement in its role as National Electricity Transmission System Operator (NETSO) relating to any potential changes to the CUSC which take place in forums other than the CUSC Modifications Panel.

  • Published: 15th Sep 2011
  • Other
  • 1 Associated documents
This proposal sought to replace all reference to “recommendations” in the Connection and Use of System Code (CUSC) Modification Report other than that which refers to the recommendation of the CUSC Modifications Panel.

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