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: 1st Feb 2019
  • Decisions
  • 1 Associated documents
See our decision to send back modification proposal to the CUSC.

  • Published: 6th Dec 2018
  • Decisions
  • 1 Associated documents
We have approved this modification to the Connection and Use of System Code (CUSC).

  • Published: 6th Dec 2018
  • Decisions
  • 1 Associated documents
We have approved this modification to the Connection and Use of System Code (CUSC).

  • Published: 28th Nov 2018
  • Open letters and correspondence
  • 1 Associated documents
Letter outlining our view that work on CMP308 should not progress until the conclusions of the forthcoming Balancing Services Charges Task Force are known.

  • Published: 20th Nov 2018
  • Decisions
  • 1 Associated documents
We have appr9oved this modification to the Connection and Use of System Code (CUSC).

  • Published: 20th Nov 2018
  • Decisions
  • 1 Associated documents
We have approved this modification to the Connection and Use of System Code (CUSC).

  • 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).

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