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: 5th Nov 2018
  • Decisions
  • 1 Associated documents
Letter to decide urgency on CMP302 ‘to extend the small generator discount until an enduring solution acknowledging the discrepancy between England & Wales and Scotland is implemented’.

  • Published: 5th Nov 2018
  • Decisions
  • 1 Associated documents
See our decision that the final modification report for CMP301 should be revised and resubmitted.

  • Published: 25th Oct 2018
  • Decisions
  • 1 Associated documents
We have rejected this modification to the Connection and Use of System Code (CUSC).

  • Published: 12th Oct 2018
  • Decisions
  • 1 Associated documents
Authority direction for code modification to Connection and Use of System Code (CUSC).

  • Published: 17th Aug 2018
  • Decisions
  • 1 Associated documents
We have accepted this modification to the Connection and Use of System Code (CUSC).

  • Published: 15th Aug 2018
  • Decisions
  • 1 Associated documents
We have rejected this modification to the Connection and Use of System Code (CUSC).

  • Published: 22nd Jun 2018
  • Decisions
  • 7 Associated documents
We have directed that WACM4 of industry proposals CMP264/265 be implemented. A challenge to this decision was dismissed by the High Court in June 2018.

  • Published: 24th Jan 2018
  • News and blogs
  • 0 Associated documents
Ofgem has been served with a claim for judicial review concerning its decision on industry proposals CMP264 and CMP265.

  • Published: 28th Nov 2017
  • Decisions
  • 1 Associated documents
The Authority have approved this modification to the Connection and Use of System Code (CUSC) on 28 November 2017.

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