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: 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.

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

  • Published: 3rd Jul 2020
  • Decisions
  • 1 Associated documents
We have approved these modifications to the CUSC.

  • Published: 23rd Jun 2020
  • Decisions
  • 1 Associated documents
We have approved this modification to the CUSC (Connection and Use of System Code).

  • Published: 23rd Jun 2020
  • Decisions
  • 1 Associated documents
We have approved this modification to the CUSC (Connection and Use of System Code).

  • Published: 21st May 2020
  • Decisions
  • 1 Associated documents
We have approved this modification to the CUSC (Connection and Use of System Code).

  • Published: 20th May 2020
  • Decisions
  • 1 Associated documents
We have approved this modification which will align the rate of return applied to the calculation of annual connection charges to the pre-tax cost of capital in the RIIO price control.

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