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: 25th Oct 2012
  • Decisions
  • 1 Associated documents
CUSC Modification Proposal CMP201 (Removal of BSUoS from generators) was submitted to us for decision on 10 October 2012.

  • Published: 18th Sep 2012
  • Other
  • 1 Associated documents
CMP203 seeks to modify the CUSC so that any User who pays separately for One-off works will not be charged again for the value of those works through Transmission Network Use of System (TNUoS) charges.

  • Published: 15th Aug 2012
  • Other
  • 1 Associated documents
CMP202 sought to modify the CUSC to remove Balancing Service Use of System (BSUoS) Charges from Interconnector Balancing Mechanism (BM) Units.

  • Published: 22nd May 2012
  • Decisions
  • 1 Associated documents
CMP204 amends the CUSC to reflect Grid Code changes (D/11) made regarding System to Generator Operational Intertripping Schemes.

  • Published: 30th Apr 2012
  • Other
  • 1 Associated documents
CMP200 sought to implement changes to the CUSC arising from the due diligence review of the offshore generator build options.

  • Published: 30th Mar 2012
  • Other
  • 1 Associated documents
CMP192 would modify the Connection and Use of System Code (CUSC) to include new arrangements for calculating user commitment liabilites, and associated securities, for both pre- and post-commissioning generators.

  • Published: 13th Feb 2012
  • Closed: 12th Mar 2012
  • Consultations and responses
  • 23 Associated documents
This document presents, for consultation, our assessment of the impacts of CMP 192 and our developing thinking.

  • Published: 17th Jan 2012
  • Decisions
  • 1 Associated documents
CMP198 would modify the Connection and Use of System Code (CUSC) to provide a proposer of a CUSC modification with more ownership of the proposal prior to the Code Administrator Consultation.

  • Published: 16th Jan 2012
  • Other
  • 1 Associated documents
This modification clarifies the role and responsibliilites of relevant parties with respect to gas insulated switchgear at sub-stations.

  • Published: 15th Dec 2011
  • Other
  • 1 Associated documents
This proposal sought to remove the restriction on entities without an Approved Credit Rating providing a financial guarantee, enabling this to be provided by way of an Independent Credit Assessment.

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