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 Jul 2019
  • Decisions
  • 1 Associated documents
We have approved this modification to the Connection and Use of System Code (CUSC).

  • Published: 11th Jun 2019
  • Decisions
  • 1 Associated documents
Authority decision to send back Connection and use of System Code (CUSC) modification.

  • Published: 11th Jun 2019
  • Decisions
  • 1 Associated documents
We have approved this modification to the Connection and Use of System Code (CUSC).

  • Published: 17th Apr 2019
  • Decisions
  • 1 Associated documents
We have decided to send back CMP285 (CUSC Governance Reform – Leveling the Playing Field) for further work.

  • Published: 27th Mar 2019
  • Decisions
  • 1 Associated documents
We have approved this modification to the Connection and Use of System Code (CUSC).

  • Published: 27th Feb 2019
  • Decisions
  • 1 Associated documents
CMP312 ‘Correcting erroneous legal text in Section 14 following implementation of CMPs 264/5 (consequential)’ – decision on urgency

  • 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.

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