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: 16th Jul 2015
  • Decisions
  • 1 Associated documents
The Authority has approved CUSC Modification Proposal CMP223 WACM1.

  • Published: 30th Mar 2015
  • Decisions
  • 1 Associated documents
We have approved this modification to the Connection and Use of System Code (CUSC).

  • Published: 13th Mar 2015
  • Decisions
  • 1 Associated documents
The Authority has approved Modification Proposal CMP238 ‘Application of Statement of Works process when a modification application is made'.

  • Published: 26th Feb 2015
  • Decisions
  • 1 Associated documents
We have approved this modification to the Connection and Use of System Code (CUSC)

  • Published: 23rd Oct 2014
  • Decisions
  • 1 Associated documents
Following consultation in September 2014, the Authority has decided to direct that the report on CUSC modification proposal 223 ‘Arrangements for Relevant Distributed Generators under the enduring Generation User Commitment’ be revised and resubmitted.

  • Published: 21st Oct 2014
  • Decisions
  • 1 Associated documents
We have approved this modification to the Connection and Use of System Code (CUSC)

  • Published: 9th Oct 2014
  • Decisions
  • 1 Associated documents
We have approved this modification to the Connection and Use of System Code (CUSC)

  • Published: 3rd Oct 2014
  • Decisions
  • 1 Associated documents
We have rejected this modification to the Connection and Use of System Code (CUSC)

  • Published: 1st Sep 2014
  • Closed: 3rd Oct 2014
  • Consultations and responses, Open letters and correspondence
  • 4 Associated documents
CMP 223 proposes revising security requirements for a subset of distributed generators. Our open letter provides an opportunity for stakeholders, particularly embedded generators, to give their views.

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