Grid Codes

The main technical requirements to be met by users of the transmission system are outlined in the SONI Grid Code. This Code sets out the principles governing SONI's relationship with users and technical standards to be complied with by SONI and users.  The Code specifies procedures for planning, connecting to and operating the transmission system during both normal and exceptional circumstances.

SONI is responsible for keeping the Grid Code up to date and, to do so, meets with users on a regular basis to discuss any necessary modifications to the Code.  Any modifications to the Code must be approved by the Utility Regulator (UR).

Please note that this published version of the SONI Grid Code should be read in conjunction with the UR approved modifications post the Grid Code publication date of December 2018. They are detailed in the Grid Code Modification Section below.

Wind Farm Power Station Settings Schedule

The Grid Code Constitution and Membership is available here

The Grid Code Meetings and Working Groups are available here

The Grid Code Documentation including Modifications and Consultations is available below. 

RoCoF Grid Code Modification 

DSU Approved Modifications

Regulatory Approval Letter for Grid Code Modification application is available here.

Regulatory Approval Document 16112016 Outturn Availability is available here

Regulatory Approval Letter 16112016 Outturn Availability is available here

Regulatory Approved Document Power Park Module 16112016 is available here

Regulatory Approval Letter 16112016 Power Park Module is available here

Regulatory Approved Document Dynamic Models 16112016 is available here

Regulatory Approval Letter 16112016 Dynamic Models is available here

Regulatory Approval Letter 17122015 (retirement of plant) is available here

Regulatory Approval Letter 05102015 is available here

Regulatory Approval Letter 29092015 is available here

Regulatory Approval Letter 30042015 is available here

DSU 2013 Modification is available here

DSU Application Form Data Modification is available here

DSU Notice Time Modification is available here

DSU Signal Requirements Modification is available here

RoCoF Grid Code Modification Report to NIAUR published 27 August 2013 is available here

RoCoF Grid Code Modifications (Clean) is available here

RoCoF Modifications Proposal - TSOs Opinion is available here

RoCoF Modification Consultation Paper is available here

Proposed modifications to the SONI Grid Code in respect of Demand Side Units published 10th May 2013 is available here

Regulatory Approval Letter 05102015 is available here

Failure to Synchronise Grid Code Modifications (Clean) is available here

Failure to Synchronise Grid Code Modifications (Redline) is available here

WFPS Grid Code Modifications (Clean) is available here

WFPS Grid Code Modifications (Redline) is available here

Intraday Trading Grid Code Modifications (Comparison Result) is available here

Intraday Trading Grid Code Modifications (Modified Document) is available here

SONI Grid Code Modification Proposal on Over-installed Units available here

SONI Consultation on Advanced Meter Reconcilation Consultation paper Appendix B is available here

SONI Consultation on Advanced Meter Reconcilation Consultation paper Appendix A is available here

SONI Consultation on Advanced Meter Reconcilation Consultation paper is available here

SONI Consultation on Advanced Meter Reconciliation Cover Letter is available here

SONI Consultation on Outturn Availability Grid Code Modification published 15 February 2016 is available here

SONI Grid Code Modification Proposal on Outturn Availability (clean) is available here

SONI Grid Code Modification Proposal on Outturn Availability (redline) is available here

Power Park Modules Grid Code Amendments Consultation Paper published 8 January 2016 is available here

Power Park Modules Grid Code Amendments Consultation Paper (Grid Code amendments - clean) published 8 January 2016 is available here

Power Park Modules Grid Code Amendments Consultation Paper (Grid Code amendments - redline) published 8 January 2016 is available here

SONI Consultation Information Letter on Notice of Intention to Disconnect due to Retirement of Plant is available here

SONI Consultation on Notice of Intention to Disconnect due to Retirement of Plant is available here

Dynamic Modelling Modification Consultation Introduction Report Final - published 2 December 2013 is available here

Draft Modelling SONI Grid Code Modification v4 redline - is available here

Demand Side Units - Grid Code Amendments Consultation Paper published 10 May 2013 is available here

Demand Side Units - Grid Code Amendments Consultation Paper published 1 November 2011 is available here

Demand Side Units - Grid Code Amendments Consultation Paper (Grid Code amendments - clean) published 1 November 2011 is available here

Demand Side Units - Grid Code Amendments Consultation Paper (Grid Code amendments - redline) published 1 November 2011 is available here

Process for the Calculation of Outturn Availability Consultation Document published 1 February 2013 is available here

Rate of Change of Frequency Modifications Grid Code Amendments Consultation Paper published 17 October 2012 is available here

Eirgrid response to the Consultation Paper on Treatment of Curtailment in Tie-break Situations (SEM-12-028) published 25 May 2012 is available here

Failure to Follow Synchronising Instruction Grid Code Amendments Consultation Paper published 23 May 2012 is available here

WFPS Ramp Rate Grid Code Amendments Consultation Paper published 8 November 2011 is available here

News Update - 28 September 2018

SONI Grid Code Constitution Amendments regarding membership of the Grid Code review panel

SONI was recently pleased to present the Notification Letter and Consultation Document for the above. The documents can be found in the following links:

The consultation period commenced on Friday 28 September 2018 and ended at close of business on Friday 26 October 2018. Any comments or replies were directed to julianne.scullion@eirgrid.com, copying gridcode@soni.ltd.uk.