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Modifications 

Our decision letters for proposed changes to this code are contained in the table below.



DateTitle (Click for more document information)
30/04/2012Grid Code F/11: Generator Led Due Diligence Review
09/03/2012Grid Code H/11: Data Validation, Consistency and Defaulting Rules
17/01/2012Grid Code G/11: Grid Code Housekeeping Modifications
25/10/2011Grid Code B/11: Provisions for Electronic Communication of System Warnings between National Grid Electricity Transmission (NGET) and users
10/10/2011Grid Code E/11: Reactive Despatch Network Restrictions
08/09/2011Grid Code C/10: Grid Code Requirement for Electronic Communication Facilities between National Grid Electricity Tranmission (NGET) and Balancing Mechanism (BM)
05/08/2011Grid Code A/11: Black Start: Amendments to Grid Code resulting from Balancing and Settlement Code (BSC) modification P231
04/07/2011Grid Code D/10 Frequency and Voltage Operating Range
20/12/2010Grid Code C/09 Housekeeping Amendments
17/12/2010Grid code F/10: Code Governance Review - Environmental Assessment
05/11/2010Grid Code B/09: Grid Code Requirements for Category 5 Intertripping Schemes
04/10/2010Grid Code H/09: Submission of detailed Planning Data
23/08/2010G/09 Grid Code Short Circuit requirement in respect of very Large Synchronous Generating Units
27/01/2010D09 OC6.6 Automatic Low Frequency Demand Disconnection (LFDD)
20/01/2010F/09 Grid Code changes relating to BSC proposal P243
21/12/2009E09 Grid Code Changes relating to Connection and Use of System Code (CUSC) Amendment Proposal CAP169 (Provision of Reactive Power from Power Park Modules, Large Power stations and Embedded Power Stations)
30/04/2009A09 Grid Code Requirements for Synchronous Generating Units Exceeding Rated MW (Mega Watt)
19/03/2009E/08 Grid Code Requirement for Forecast Generation Output for Embedded Exemptable Large Power Stations
18/03/2009G/08 Grid Code Requirements for the GB Transmission System Study Network Data File
03/03/2009F/08 Grid Code Requirements for System to Generator Operational Intertripping Schemes
20/11/2008D/08 Grid Code Requirements for Technical performance - decision letter
30/09/2008Grid Code decision letter - C08 Data Exchange
18/09/2008B/07 Improved Planning Code Data Exchange for Compliance Assessments
22/08/2008B/08 Grid Code Requirements for Power Park Modules - Voltage Control and Reactive power
01/07/2008G07 Black Start
13/06/2008A08 Emergency Instruction to Emergency De-Energise
28/03/2008F07 Grid Code Requirements for Current Sourced DC Links
25/03/2008G06 Power Park Modules and Synchronous Generating Units
06/02/2008D07 Frequency Response Requirements
26/10/2007C07 Timescales for the National Grid Notification of Operational Metering
26/10/2007F06 Control and System Telephony
23/10/2007E07 Data Exchange Provisions
06/09/2007C06 Control Telephony Electrical Standard
28/06/2007A07 Management of 'No System Connection'
27/02/2007E06 Low Frequency Demand Disconnection Relay Settings
27/05/2005Decision and direction in relation to consultations H/04, Grid Code Changes to Incorporate New Generation Technologies and DC Inter-connectors (Generic Provisions) and SA/2004, Consultation on Technical Requirements for Windfarms
- (Reference number: 142/05)
26/05/2005Consultation on requests from Scottish generators for lifetime derogation against specific Grid Code conditions which have been raised in association with the introduction of BETTA
- (Reference number: 141/05)
17/01/2005New generation technologies and GB grid codes: Report on change proposals to the grid codes in England and Wales and in Scotland prepared by Sinclair Knight Merz
17/01/2005Grid Code Changes to Incorporate New Generation Technologies and DC Inter-connectors (Generic Provisions) The Authority's Minded To decision letter and Impact Assessment relating to the National Grid Company's H/04 Report to the Authority
- (Reference number: 07/05)
17/01/2005 Consultation on Technical Requirements for Windfarms The Authority's Minded To decision letter and Impact Assessment relating to the Scottish transmission licensees SA/2004 Report to the Authority
- (Reference number: 08/05)
24/05/2004Meeting Notes from New Generation Technologies and the Grid Codes Forum 30 April 2004
16/04/2004New Generation Technologies and the GB Grid Codes Forum - March24/25 2004