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: 3rd Dec 2020
  • Decisions
  • 1 Associated documents
We have approved this modification to the CUSC.

  • Published: 3rd Dec 2020
  • Decisions
  • 1 Associated documents
We have approved this modification to the CUSC.

  • Published: 30th Nov 2020
  • Decisions
  • 1 Associated documents
We have approved this modification to the CUSC.

  • Published: 11th Nov 2020
  • Decisions
  • 1 Associated documents
We have approved CMP325 and rejected CMP324 modifications to the CUSC.

  • Published: 9th Nov 2020
  • Decisions
  • 1 Associated documents
Decision on urgency for modification to the CUSC.

  • Published: 2nd Nov 2020
  • Open letters and correspondence
  • 5 Associated documents
We have received a request for an appeal against the self-governance decision to approve CMP342.

  • Published: 2nd Oct 2020
  • Open letters and correspondence
  • 1 Associated documents
Open letter on progress on electricity storage network charging arrangements and determination of CMP280.

  • Published: 13th Aug 2020
  • Decisions
  • 1 Associated documents
We have approved this modification to the CUSC.

  • Published: 21st Jul 2020
  • Decisions
  • 1 Associated documents
Decision on urgency for modification to the CUSC.

  • Published: 10th Jul 2020
  • Decisions
  • 1 Associated documents
We have approved this modification to the CUSC.

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