Information regarding cookies and WWW.SEM-O.COM

By using this website, you consent to the use of cookies in accordance with the Single Electricity Market Operator’s Cookie Policy.
For more information on cookies and our Cookie Policy please follow this link.

I accept

 Modifications 

Click for RSS Feed

 The Trading and Settlement Code Modifications Committee is the forum for considering change to the Trading and Settlement Code. The Modifications Committee meets every 2 months. Details of all scheduled meetings can be found on the Market Development calendar.

The 2018 calender of Modification events is available for download at this link






12345
Mod ID Title Mod Status Stage Section Affected Effective Date
MOD_37_18 MOD_37_18 Housekeeping between V20 and V21 New Active    
MOD_36_18 MOD_36_18 Settlement Document and Invoice Terminology Clarifications New Active    
MOD_35_18 MOD_35_18 Clarification to dispute process New Active T&SC Section 1  
MOD_34_18 MOD_34_18 Removal of MWPs for biased quantities and negative imbalance revenue and clarifications to determination of Start Up Costs Final New Active    
MOD_33_18 MOD_33_18 Update to Unit Under Test Process New Active    
MOD_32_18 MOD_32_18 Removal of exposure for "in merit" generator units against BOA New Active    
MOD_31_18 Imbalance Pricing During Outages of the Imbalance Pricing System RA Decision: Approved (Not Vetoed) Active   27/09/2018
MOD_30_18 Market Back Up Price Ammendment RA Decision: Approved (Not Vetoed) Active   27/09/2018
MOD_29_18 Part B Schedule Production Cost Definition RA Decision: Approved (Not Vetoed) Active   27/09/2018
MOD_28_18 Ordering of Pseudo Dispatch Instructions for QBOA with the same Instruction Issue Time and Instruction Effective Time RA Decision: Approved (Not Vetoed) Active   27/09/2018
MOD_27_18 Interim arrangements in Appendix O for Instruction Profiling and Bid Offer Acceptance Quantity Outcomes in a Subset of Undo Scenarios RA Decision Rejected Closed    
MOD_26_18 Market Back Up Price Reference Corrections RA Decision: Approved (Not Vetoed) Active   27/09/2018
MOD_25_18 Part B Unsecured Bad Energy Debt and Unsecured Bad Capacity Debt Timelines and Correction Deferred Active T&SC Glossary; Agreed Procedure 15  
MOD_24_18 Use of Technical Offer Data in Instruction Profiling / QBOA RA Decision: Approved (Not Vetoed) Active T&SC Appendix O 27/09/2018
MOD_23_18 Payment and Invoice Day Exchange Rates for Part A Currency Cost Calculations Post Cutover Recommended for Approval Active Agreed Procedure 15  
MOD_22_18 Part B Credit Cover Signage & Subscript Correction RA Decision: Approved (Not Vetoed) Active T&SC Glossary 27/09/2018
MOD_21_18 Application of Settlement Reallocation Agreements to Market Operator Charges & Settlement Dcument Definition & Usage RA Decision: Approved (Not Vetoed) Active T&SC Appendix G; T&SC Glossary; Agreed Procedure 1; Agreed Procedure 10; Agreed Procedure 15; Agreed Procedure 17 27/09/2018
MOD_20_18 Agreed Procedure Updates RA Decision: Approved (Not Vetoed) Active Agreed Procedure 1; Agreed Procedure 4; Agreed Procedure 15; Agreed Procedure 17 27/09/2018
MOD_19_18 Part B Housekeeping 1 RA Decision: Approved (Not Vetoed) Active T&SC Appendix E; T&SC Appendix H; T&SC Appendix I; T&SC Glossary 27/09/2018
MOD_18_18 Mod_18_18 Transitional Regulatory Reporting Withdrawn Closed    
MOD_17_18 Mod_17_18 Transitional Provisions for Cutover RA Decision: Approved (Not Vetoed) Active   27/09/2018
MOD_16_18 Mod_16_18 Interim Suspension Delay Periods RA Decision: Approved (Not Vetoed) Active   27/08/2018
MOD_15_18 Mod_15_18 Clarifications for Instruction Profiling RA Decision: Approved (Not Vetoed) Active   27/08/2018
MOD_14_18 Mod_14_18 Change to timing of publication of Trading Day Exchange Rate RA Decision: Approved (Not Vetoed) Active   27/08/2018
MOD_13_18 Mod_13_18 Calculating Obligated Capacity Quantities for Units Not Yet Commissioned RA Decision: Approved (Not Vetoed) Active   27/08/2018
MOD_12_18 Mod_12_18 Modifcation to Part B Agreed Procedure 17 Recommended for Approval Active    
MOD_11_18 Mod_11_18 Correction of Minor Material Drafting Errors RA Decision: Approved (Not Vetoed) Active   20/06/2018
MOD_10_18 Mod_10_18 Amendment to Capacity Settlement Publication from Monthly to Daily RA Decision: Approved (Not Vetoed) Active   20/06/2018
MOD_09_18 Mod_09_18 Interim Credit Treatment for Participants with Trading Site Supply Units RA Decision: Approved (Not Vetoed) Active   27/08/2018
MOD_08_18 Mod_08_18 Clarification of rules used to determine the value of Price Average Reference Tag (TPAR) RA Decision: Approved (Not Vetoed) Active   21/06/2018
MOD_07_18 Mod_07_18 Clarifications of use of variable “b” in NIV and PAR Tagging scenarios RA Decision: Approved (Not Vetoed) Active   27/08/2018
MOD_06_18 Mod_06_18 - Clarification of Marginal Energy Action Price calculation including scenario when all actions are flagged RA Decision: Approved (Not Vetoed) Active   21/06/2018
MOD_05_18 Mod_05_18 Clarification of Administered Scarcity Pricing function for scenarios not yet covered in rules RA Decision: Approved (Not Vetoed) Active   20/06/2018
MOD_04_18 Mod_04_18 Reporting and Publication for Operational Schedules, Dispatch Instructions, Forecast Availability and SO Trades RA Decision: Approved (Not Vetoed) Active   20/06/2018
MOD_03_18 Autoproducer Credit Cover Deferred Active    
MOD_02_18 Meter Data Publication Timing Recommended for Approval Active    
MOD_01_18 Notification of Suspension to SEM NEMOs RA Decision: Approved (Not Vetoed) Active   05/04/2018
MOD_18_17 Net Inter Jurisdictional Flow Submission RA Decision: Approved (Not Vetoed) Active   27/09/2018
MOD_17_17 Recovery of Costs due to Invalid Ex-Ante Contracted Quantities in Imbalance Settlement RA Decision: Approved (Not Vetoed) Active T&SC Section 1 20/04/2018
MOD_16_17 Funding in relation to EirGrid/SONI payment obligations RA Decision: Approved (Not Vetoed) Active T&SC Section 1 20/04/2018
MOD_15_17 Credit Treatment for Adjusted Participants RA Decision: Approved (Not Vetoed) Active   29/03/2018
MOD_14_17 Part B Suspension When Suspended Under Part A RA Decision: Approved (Not Vetoed) Active   29/03/2018
MOD_13_17 Deferral of SEM NEMO Credit Reports and Non-acceptance of Contracted Quantities RA Decision: Approved (Not Vetoed) Active T&SC Section 1 27/08/2018
MOD_12_17 Outage Adjusted Wind and Solar Forecast Reports RA Decision: Approved (Not Vetoed) Active T&SC Section 1 29/03/2018
MOD_11_17 Deferral of Information Imbalance Charges RA Decision: Approved (Not Vetoed) Active   09/02/2018
MOD_10_17 Ex-Ante Quantities Deferral RA Decision: Approved (Not Vetoed) Active   26/02/2018
MOD_09_17 Solar in I-SEM RA Decision: Approved (Not Vetoed) Active   06/02/2018
MOD_08_17 Decremental Price Quantity Pair Submission RA Decision: Approved (Not Vetoed) Active   06/02/2018
MOD_07_17 Credit Assessment Volume for Generator Units RA Decision: Approved (Not Vetoed) Active T&SC Section 1 06/02/2018
MOD_06_17 Transitional Credit Cover Provisions RA Decision: Approved (Not Vetoed) Active T&SC Section 1 26/02/2018
MOD_05_17 Amendment to the Part B Form of Authority for the purpose of removing the Restricted Authority provision RA Decision: Approved (Not Vetoed) Active T&SC Section 1 24/10/2017
MOD_04_17 Solar in the SEM RA Decision: Approved (Not Vetoed) Active T&SC Section 1 24/10/2017
MOD_03_17 Treatment of Transmission Losses for Trading Sites with Contiguous Autoproducers in I-SEM RA Decision: Approved (Not Vetoed) Active T&SC Section 1 19/10/2017
MOD_02_17 Unsecured Bad Energy Debt & Unsecured Bad Capacity Debt Timelines. RA Decision: Approved (Not Vetoed) Active T&SC Section 1 27/09/2018
MOD_01_17 Changes to enable I-SEM (Part A) Implemented Closed T&SC Section 1 23/05/2017
MOD_02_16 Mod_02_16 Changes to MEC for DSU Withdrawn Closed T&SC Section 1  
MOD_01_16 Proposal to end M+13 obligations under the TSC following the completion of M+4 resettlement period plus dispute window. Implemented Closed T&SC Section 2; T&SC Section 6; T&SC Appendix E; T&SC Appendix J; T&SC Glossary; Agreed Procedure 6; Agreed Procedure 13; Agreed Procedure 14; Agreed Procedure 15; Agreed Procedure 16 20/04/2017
MOD_09_15 AP07 Amendment to Update Process re Submission Failure Implemented Closed T&SC Section 1 10/02/2016
MOD_08_15 Clarification of Outturn Availability Implemented Closed T&SC Section 1 20/04/2017
MOD_07_15 Amendment of AP7 to include the use of the SEMO public website and e-mail notification as the main communication channel in the event of a GCF. Implemented Closed Agreed Procedure 7 03/07/2015
MOD_06_15 REMIT Data Reporting by the Organised Market Place to ACER Implemented Closed T&SC Section 3; T&SC Glossary; Agreed Procedure 5 02/10/2015
MOD_05_15 Representation of Interconnector User Participants on the Modification Committee Implemented Closed T&SC Section 2; T&SC Glossary; Agreed Procedure 12 15/06/2015
MOD_04_15 Modification to Relevant Meter Operator Role and support requirements for Meter Communication Channels Withdrawn Closed T&SC Section 3; T&SC Appendix L; T&SC Glossary  
MOD_03_15 Correction of Error in AP04 Implemented Closed Agreed Procedure 4 07/05/2015
MOD_02_15 Permitting DSUs registrants to register as either a TSSU or as an ASU in the Single Electricity Market Withdrawn Closed T&SC Section 5  
MOD_01_15 Tolerance for Metered Volume changes in Settlement Queries Implemented Closed Agreed Procedure 16 06/03/2015
MOD_16_14 DSUs as Predictable Price Takers Withdrawn Closed T&SC Section 5; T&SC Appendix I  
MOD_15_14 (Mod_12_14) Amendment to Make Whole Mechanism to remove Settlement Periods of simultaneous import and export flows RA Decision Rejected Closed T&SC Section 4  
MOD_14_14 (Mod_11_14) Pay-As-Bid/Paid-As-Bid for Interconnector Units Implemented Closed T&SC Section 5  
MOD_13_14 (Mod_10_14) Make Whole Payments for Interconnector Units RA Decision Rejected Closed T&SC Section 4  
MOD_12_14 (Mod_09_14) Amendment to Make Whole Payments for Interconnector Units RA Decision Rejected Closed T&SC Section 4 02/10/2015
MOD_10_14 (Mod_08_14) Clarification of Location of SEM Collateral Reserve Accounts Implemented Closed T&SC Section 6 09/09/2016
MOD_07_14 Change to Final Registration Meeting Requirements to allow for email Implemented Closed Agreed Procedure 1 08/09/2014
MOD_06_14 Change to AP04 Section 2.4 relating to cancellation of a Unit Under Test for the EA1 run in D-1 Implemented Closed Agreed Procedure 4 01/05/2014
MOD_05_14 Update of AGU and DSU registration provisions Implemented Closed T&SC Section 2; T&SC Section 5 03/04/2014
MOD_04_14 Change to Uplift Parameters Determination Timeline Withdrawn Closed T&SC Section 4  
MOD_03_14 Change in Timeline for Submission of MO Report on Annual Capacity Exchange Rate Implemented Closed T&SC Section 4 03/04/2014
MOD_02_14 Housekeeping 7 Implemented Closed T&SC Section 4 03/04/2014
MOD_01_14 Removal of obligation to publish Ex-Ante Margin Implemented Closed T&SC Appendix E; Agreed Procedure 6 03/04/2014
MOD_14_13 Update of references to the SEM Bank in Agreed Procedure 17 Implemented Closed Agreed Procedure 17 10/01/2014
MOD_13_13 Update to AP14 ‘Disputes’ Implemented Closed Agreed Procedure 14 10/01/2014
MOD_12_13 Amendment to Special Units Pumped Storage definition to include Energy Storage Implemented Closed T&SC Section 2; T&SC Section 4; T&SC Section 5; T&SC Appendix H; T&SC Appendix I; T&SC Appendix M; T&SC Appendix N; T&SC Appendix O; T&SC Glossary 17/11/2015
MOD_11_13 Amendment of AP5 to update the encryption key standard from 1024 bit to 2048 bit Implemented Closed Agreed Procedure 5 10/01/2014
MOD_10_13 Removal of Requirement for SOs to send certain Dispatch Instruction Codes and Instruction Combination Codes for Pumped Storage Units to the MO Implemented Closed T&SC Appendix O 08/11/2013
MOD_09_13 Amendment of AP7 to include the use of e-mail notification and the SEMO public website in the event of a GSF Implemented Closed Agreed Procedure 7 18/10/2013
MOD_08_13 Amendment to number of days granted to the MO for the issuing of Party Accession Deeds Implemented Closed Agreed Procedure 1 28/06/2013
MOD_07_13 Clarification regarding the rules for Instruction Profiling in Appendix O Implemented Closed T&SC Appendix O 17/07/2013
MOD_06_13 Housekeeping 6 Implemented Closed Agreed Procedure 1; Agreed Procedure 6 28/06/2013
MOD_05_13 Amendment to the definition of “Working Day” Implemented Closed T&SC Glossary 17/07/2013
MOD_04_13 Process for changing the VAT Jurisdiction of an Interconnector Unit Implemented Closed Agreed Procedure 1 24/04/2013
MOD_03_13 Mods Process Clarifications Implemented Closed T&SC Section 2; Agreed Procedure 12 20/03/2013
MOD_02_13 Registration of Charges Implemented Closed T&SC Section 1; T&SC Section 6 08/09/2016
MOD_01_13 Enduring Provisions for Interconnector point of Connection Implemented Closed T&SC Section 5; T&SC Glossary 05/03/2013
MOD_30_12 Improved Efficiencies in Unit Registration Process Implemented Closed Agreed Procedure 1 24/04/2013
MOD_29_12 Dwell Time Up & Dwell Time Down Glossary Definitions Implemented Closed T&SC Glossary 06/02/2013
MOD_28_12 Clarifications to Appendix N Implemented Closed T&SC Appendix N 06/02/2013
MOD_27_12 Representation of Price Takers in the MSP Software Implemented Closed T&SC Appendix N 11/02/2013
MOD_26_12 Notification Time for updating Interconnector Technical Data Implemented Closed Agreed Procedure 2 21/12/2012
MOD_25_12 Suspension of Interconnector Unit on instruction of Interconnector Owner due to breach of Access Rules Withdrawn Closed T&SC Section 2  
MOD_24_12 Amendments to the MIUN Calculator to address instances of Excessive Area Implemented Closed Agreed Procedure 2 03/05/2013

SEMO is a joint venture between EirGrid PLC and SONI Limited