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 Apr 2021
  • Open letters and correspondence
  • 1 Associated documents
Open letter on timing of CMP343.

  • Published: 30th Mar 2021
  • Decisions
  • 1 Associated documents
We have approved this modification to the CUSC.

  • Published: 24th Mar 2021
  • Decisions
  • 1 Associated documents
Decision on urgency on modification to the CUSC.

  • Published: 28th Jan 2021
  • Decisions
  • 1 Associated documents
We have approved this modification to the CUSC.

  • Published: 27th Jan 2021
  • Decisions
  • 1 Associated documents
We have approved this modification to the CUSC.

  • Published: 22nd Jan 2021
  • Decisions
  • 1 Associated documents
We have approved these modifications to the CUSC.

  • Published: 18th Jan 2021
  • Decisions
  • 1 Associated documents
Decision on urgency for modifications to the CUSC.

  • Published: 14th Jan 2021
  • Decisions
  • 0 Associated documents
SSE Generation Limited has appealed to the Competition and Markets Authority (CMA) regarding Ofgem's approved code modifications, CMP317/327 and CMP339, on 17 December 2020.

  • Published: 30th Dec 2020
  • Decisions
  • 1 Associated documents
Decision on urgency for modification to the CUSC.

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