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: 12th Jun 2013
  • Decisions
  • 1 Associated documents
Modifications CMP209 and CMP210 would change the Connection and Use of System Code (CUSC) to allow suppliers to provide demand forecast data (including negative demand data) to National Grid in order to pay or receive monthly monies from National Grid...

  • Published: 12th Mar 2013
  • Closed: 7th May 2013
  • Consultations and responses
  • 1 Associated documents
See our consultation on Connection and Use of System Code ('CUSC') modification proposals ('CMP') 209 and 210.

  • Published: 13th Feb 2013
  • Other
  • 1 Associated documents
CMP208 seeks to obligate National Grid to provide forecasts of the current year’s and following year’s Balancing Services Use of System (BSUoS) costs on a monthly basis through the Connection and Use of System Code (CUSC).

  • Published: 21st Jan 2013
  • Guidance
  • 1 Associated documents
CMP207 would seek to reduce the volatility of Transmission Network Use of System (TNUoS) charges paid to National Grid by all transmission network demand users by capping the level of charges to a specified percentage level.

  • Published: 19th Dec 2012
  • Other
  • 1 Associated documents
CMP214 seeks to amend the implementation of required updates to certain Transmission Network Use of System (TNUoS) charging parameters after the start of a new price control period to the second year of the price control.

  • 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.

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