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: 10th Feb 2016
  • Decisions
  • 1 Associated documents
We have approved this modification to the Connection and Use of System Code (CUSC).

  • Published: 10th Nov 2015
  • Decisions
  • 1 Associated documents
We have approved this modification to the Connection and Use of System Code (CUSC).

  • Published: 17th Sep 2015
  • Decisions
  • 1 Associated documents
We have rejected this modification to the Connection and Use of System Code (CUSC).

  • Published: 12th Aug 2015
  • Decisions
  • 1 Associated documents
We have rejected this modification to the Connection and Use of System Code (CUSC).

  • 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.

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