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: 27th Jun 2014
  • Decisions
  • 1 Associated documents
CMP225 seeks to make consequential changes to the Connection and Use of System Code (CUSC) to reflect licence changes made to implement the European Third Package.

  • Published: 29th Jan 2014
  • Decisions
  • 1 Associated documents
CMP221 sought to make consequential changes to the CUSC following approval of BSC mod P276 which introduces the concept of a Partial Shutdown and allows market operation to continue during a Partial Shutdown.

  • Published: 19th Nov 2013
  • Decisions
  • 1 Associated documents
CMP220 seeks to introduce the ‘fast track’ self-governance process to the CUSC governance rules to implement Ofgem’s Code Governance Review Phase 2 licence changes which came into effect in August 2013.

  • Published: 13th Sep 2013
  • Open letters and correspondence
  • 1 Associated documents
We have decided that it would be proportionate to extend the consultation period by 2 weeks to assist stakeholders who consider that they need additional time to make their responses.

  • Published: 1st Aug 2013
  • Closed: 10th Oct 2013
  • Consultations and responses
  • 38 Associated documents
This document consults on proposals to amend the electricity transmission charging methodology that have been submitted to us by industry as part of CUSC modification proposal 213 (CMP213). It sets out our impact assessment and minded-to position.

  • 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.

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