Modifications 

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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 2012 calender of Modification events is available for download at this link






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Mod ID Title Mod Status Stage Section Affected Effective Date
MOD_13_12 Housekeeping 5 New Active T&SC Section 2; T&SC Section 4; T&SC Appendix O; T&SC Glossary; Agreed Procedure 1  
MOD_12_12 Mandating adherence to the Bidding Code of Practice by all Price Maker Generator Units New Active T&SC Section 4; T&SC Glossary  
MOD_11_12 Proposal to extend the definition of Special Units to include Compressed Air Energy Storage. New Active T&SC Section 5  
MOD_10_12 Amendment to Appendix P to ensure correct treatment of Interconnector Unit Offer Data New Active    
MOD_09_12 Treatment of Settlement Reruns of EP1 following MSP Failure Recommended for Approval Active T&SC Section 6  
MOD_08_12 Calculation of Modified Interconnector Unit Nominations (MIUNs) for SEM Intra-Day Trading Recommended for Approval Active Agreed Procedure 2  
MOD_07_12 Testing Charge Calculation for the Interconnector Error Unit when Under Test Recommended for Approval Active T&SC Section 5  
MOD_06_12 Improved Efficiencies in LCF Process Recommended for Approval Active Agreed Procedure 7  
MOD_05_12 Cross Border Settlement Reallocation Calculations RA Decision: Approved (Not Vetoed) Active T&SC Section 6
 07/03/2012
MOD_04_12 Corporate Website Publication Times for Capacity Settlement Data RA Decision: Approved (Not Vetoed) Active Agreed Procedure 6
 17/02/2012
MOD_03_12 Alignment of TSC with revised VAT arrangements Deferred Active T&SC Section 6
  
MOD_02_12 Amendment of Credit Cover requirements Recommended for Approval Active T&SC Section 6; T&SC Appendix A  
MOD_01_12 Representation of Demand Side Units on the Modification Committee Recommended for Approval Active T&SC Section 2  
MOD_34_11 Transition to SEM Intra-Day Trading RA Decision: Approved (Not Vetoed) Active T&SC Section 2
  
MOD_33_11 Temporary exclusion of Interconnector Error Unit Testing Charges from Settlement calculations RA Decision: Approved (Not Vetoed) Active T&SC Section 7
  
MOD_32_11 Excess Cash Collateral Drawdown Requirements RA Decision: Approved (Not Vetoed) Active T&SC Section 6; Agreed Procedure 9
 09/02/2012
MOD_31_11 Calculation of Estimated Energy Price (EEP) and Estimated Capacity Price (ECP) RA Decision: Approved (Not Vetoed) Active T&SC Section 6
 15/12/2011
MOD_30_11 Assessment and Approval of Registration Data RA Decision: Approved (Not Vetoed) Active Agreed Procedure 1
 23/12/2011
MOD_29_11 Revision of Standard Letter of Credit Template RA Decision: Approved (Not Vetoed) Active T&SC Appendix A
 09/01/2012
MOD_28_11 Alignment of AP11 with Bi-Annual Release Strategy Implemented Closed Agreed Procedure 11
 01/09/2011
MOD_27_11 Market Operator Solver Policy RA Decision: Approved (Not Vetoed) Active T&SC Section 4; T&SC Glossary
 07/03/2012
MOD_26_11 Process change for assessing Firm Access Quantity of Trading Site (FAQSst) Implemented Closed Agreed Procedure 1
 01/09/2011
MOD_25_11 Separate Residual Meter Volume Interval Proportions for each Jurisdiction Implemented Closed T&SC Section 4; T&SC Glossary
 20/10/2011
MOD_24_11 Reflection of Physical Fixity of Interconnector Flows in Operational Data Transactions Withdrawn Closed Agreed Procedure 6; Agreed Procedure 16
  
MOD_23_11 Additional clause for Standard Letter of Credit RA Decision: Approved (Not Vetoed) Active T&SC Appendix A
 07/03/2012
MOD_22_11 Housekeeping 4 Implemented Closed T&SC Section 4; T&SC Section 5; T&SC Section 6; Agreed Procedure 12
 12/07/2011
MOD_21_11 UI payments for generator units constrained on RA Decision: Approved (Not Vetoed) Active T&SC Section 5
  
MOD_20_11 SEMO Cash Pooling Implemented Closed T&SC Section 6; T&SC Glossary
 12/07/2011
MOD_19_11 Modifications Committee Representation RA Decision Rejected Closed T&SC Section 2
  
MOD_18_11 Definition of ‘Availability’ Recommended for Approval Active T&SC Glossary
  
MOD_17_11 Clarifying the requirement to provide Dispatch Instruction for Generator Units RA Decision: Approved (Not Vetoed) Active T&SC Appendix O
  
MOD_16_11 Credit Worthiness Test for SEM Bank and Credit Cover Provider banks Recommended for Approval Active T&SC Section 6; T&SC Glossary
  
MOD_15_11 Amendment to Deload Break Point Glossary Definition Implemented Closed T&SC Glossary
 08/06/2011
MOD_14_11 Pumped Storage Under Test RA Decision Rejected Closed T&SC Section 5
  
MOD_13_11 Inclusion of Other Systems Charges in the Imperfections Charge Implemented Closed T&SC Section 4; T&SC Glossary
 12/07/2011
MOD_12_11 Interconnector Unit Loss Adjustment When Exporting RA Decision: Approved (Not Vetoed) Active T&SC Section 4
  
MOD_11_11 Interconnector Data Submission Point RA Decision Rejected Closed T&SC Section 5; T&SC Glossary
 05/07/2011
MOD_10_11 Interconnector Under Test RA Decision: Approved (Not Vetoed) Active T&SC Section 5
  
MOD_09_11 Drafting Errors in relation to the Generator Units shutting down Implemented Closed T&SC Appendix N
 16/06/2011
MOD_08_11 Correcting Calculation of Net Demand Used for Settlement Withdrawn Closed T&SC Section 4
  
MOD_07_11 Qualification of Requirement for VPTs to submit TOD and COD Withdrawn Closed T&SC Section 5; T&SC Appendix I
  
MOD_06_11 Increasing Maximum Daily Submission Number and Automating Cancellation of Settlement Reallocation Agreements RA Decision: Approved (Not Vetoed) Active Agreed Procedure 10
  
MOD_05_11 Extension to Role of the Modifications Committee via Working Groups Implemented Closed T&SC Section 2; Agreed Procedure 12
 12/07/2011
MOD_04_11 Removal of requirement that a demand site in a DSU shall not have an MEC RA Decision: Approved (Not Vetoed) Active T&SC Section 5; T&SC Glossary
 09/02/2012
MOD_03_11 Housekeeping 3 Implemented Closed T&SC Section 2; T&SC Section 3; T&SC Section 4; T&SC Section 5; T&SC Section 6; T&SC Section 7; T&SC Appendix E; T&SC Appendix L; T&SC Appendix N
 08/03/2011
MOD_02_11 DLAF application for Supplier Units Implemented Closed T&SC Section 4
 26/02/2011
MOD_01_11 UI Payments for Generator Units RA Decision: Approved (Not Vetoed) Active T&SC Section 4
  
MOD_43_10 Variable Price Taker Generator Units and Firm Access RA Decision: Approved (Not Vetoed) Active T&SC Section 5
  
MOD_42_10 Changes to the Single Ramp Up Rate and the Single Ramp Down Rate Calculation RA Decision: Approved (Not Vetoed) Active T&SC Section 5; T&SC Appendix H; T&SC Appendix I; T&SC Appendix N; T&SC Glossary
  
MOD_41_10 Validation of Firm Access Quantity of Trading Site (FAQSst) by the System Operator Implemented Closed T&SC Section 2
 07/03/2011
MOD_40_10 Differentiation between Dwell Times and Dwell Trigger Points while ramping up and ramping down RA Decision: Approved (Not Vetoed) Active T&SC Appendix I; T&SC Appendix N; T&SC Appendix O
  
MOD_39_10 Change of ESU algebra from Section 7 to Section 4 Implemented Closed T&SC Section 7
 06/05/2011
MOD_38_10 Treatment of Errors Under the Code RA Decision Rejected Closed T&SC Section 2
  
MOD_37_10 Constraint Payment for Energy Limited Units RA Decision Rejected Closed T&SC Section 5
  
MOD_36_10 Removal of connection between Supplier Units and DSUs RA Decision: Approved (Not Vetoed) Active T&SC Section 2; T&SC Section 5
 04/04/2012
MOD_35_10 Clarification of Technical Offer Data Requirements Implemented Closed T&SC Section 3; T&SC Appendix I; T&SC Glossary
 08/12/2010
MOD_34_10 Clarification of the treatment of PQ Pairs for Interconnector Units Implemented Closed T&SC Section 5; T&SC Appendix N; T&SC Glossary
 17/12/2010
MOD_33_10 Unit Under Test Process Implemented Closed T&SC Section 5; T&SC Appendix F; T&SC Appendix J; Agreed Procedure 4
 11/01/2011
MOD_32_10 Dual Rated Units Clarifications Implemented Closed T&SC Appendix H; T&SC Glossary
 19/11/2010
MOD_31_10 Interconnector SEM connection point – Further extension of interim arrangements Implemented Closed T&SC Section 7
 21/10/2010
MOD_28_10 Clarification of treatment of Netting Generator Units Implemented Closed T&SC Section 2; T&SC Section 5
 11/01/2011
MOD_27_10 Housekeeping and Compliance Implemented Closed T&SC Section 2; T&SC Section 3; T&SC Section 4; T&SC Section 6; T&SC Appendix E; T&SC Glossary; Agreed Procedure 6; Agreed Procedure 12
 09/12/2010
MOD_26_10 Submission of alternative proposals Implemented Closed Agreed Procedure 12
 17/08/2010
MOD_25_10 Payment Period Currency Costs Implemented Closed Agreed Procedure 15
 17/08/2010
MOD_24_10 Introducing loss of profits as a relevant damage within the Limitation of Liability Provisions Withdrawn Closed T&SC Section 2
  
MOD_23_10 No Requirement for RA notification of Part Registration Implemented Closed Agreed Procedure 1
 10/06/2010
MOD_22_10 Timelines for EDP Data for Ad-hoc Resettlement Implemented Closed T&SC Appendix K; T&SC Appendix L; Agreed Procedure 13
 09/11/2010
MOD_21_10 Clarification of Management of Taxes and VAT Implemented Closed T&SC Section 6
 18/06/2010
MOD_20_10 Setting a De Minimis Level on Letter of Credit Drawdown Implemented Closed T&SC Section 6; Agreed Procedure 15
 18/06/2010
MOD_19_10 Clarification of Limited Communication Failure Implemented Closed Agreed Procedure 5
 17/08/2010
MOD_18_10 Intra-Day Trading
Mod_18_10 Intra-Day Trading.zipModification Proposal (43KB)
Mod_18_10 Questionnaire Development.zipQuestionnaire Development (1.0MB)
SEM Regional Integration Decision.pdfSEM Regional Integration Decision (168KB)
WG1_18_10 Report.zipWorking Group 1 (326KB)
WG2_18_10 Report.zipWorking Group 2 Report (881KB)
WG3_18_10 Report.zipWorking Group 3 Report (1.0MB)
Participant Questionnaire_WG4_v2.docParticipant Questionnaire_V2 (41KB)
Participant Questionnaire Responses.zipParticipant Questionnaire Responses (358KB)
Mod_18_10 Working Group 4 Report.zipWorking Group 4 Report (1.0MB)
Questionnarie Responses Conf Call Notes V2.docQuestionnaire Response Notes (37KB)
Conference Call 2 Action Items.zipConference Call 2 Action Items (502KB)
Participants response to Conference Call 2 Action.zipParticipants response to Conference Call 1 Action (502KB)
TSO Action WG4.pptTSO Action WG4 (717KB)
TSO preferred start time of WD Trading Day.docTSO preferred start time of WD Trading Day (20KB)
Working Group 5 Report.zipWorking Group 5 Report (1.0MB)
Working Group 6 Report.zipWorking Group 6 Report (1017KB)
Timeline.jpgTimeline (327KB)
Working Group 7 Report.zipWorking Group 7 Report (541KB)
Meeting 33 SEMO Presentation.pptMeeting 33 SEMO Presentation (862KB)
SEMC Approval Letter.pdfSEMC Approval Letter (129KB)
Meeting 35 Slides.pptMeeting 35 Slides (379KB)
Phase II Intra-Day Trading WG8.zipPhase II: WG8 Intra-Day Trading (6.0MB)
Working Group 8 Report.zipWorking Group 8 Report (1.0MB)
WG9.zipPhase II: WG9 Intra-Day Trading (8.0MB)
FG3_ParticipantReview_v1-0.xlsFG3 Comment Spreadsheet (363KB)
Timeline Intraday Trading_WG9.pdfTimeline WG9 (32KB)
High Level Design Summary.pdfHigh Level Design Summary (613KB)
Phase II WG9 Intra-Day Trading V2.zipPhase II: WG9 Intra-Day Trading V2 (12.0MB)
Conference Call 2 Minutes.zipConference Call 2 Note (507KB)
Conference Call 3 Note.zipConference Call 3 Note (703KB)
Conference Call 4 Note.zipConference Call 4 Note (600KB)
Conference Call 5 Note.docConference Call 5 Note (51KB)
WG9 Report.zipWG9 Report (2.0MB)
Timeline Intraday Trading_WG10.jpgTimeline (260KB)
SEM R2.0.0 Reporting Changes Summary.xlsSEM R2.0.0 Reporting Changes Summary (147KB)
Participant Feedback IDT Process.zipParticipant Feedback IDT Process (584KB)
Terms of Reference Phase II.docTerms of Reference Phase II (75KB)
SEMO response to FG3 Participant feedback.xlsSEMO response to FG3 Participant feedback (789KB)
FG3 SEMO Responses.zipFG3 SEMO Responses (439KB)
FG2 Participant Review Spreadsheet.xlsFG2 Participant Review Spreadsheet (89KB)
Phase II Working Group 10.zipPhase II Working Group 10 (17.0MB)
Working Group 10 Report.zipWorking Group 10 Report (2.0MB)
SEMO Response to FG2 Participant comments.xlsSEMO Response to FG2 Participant comments (179KB)
WG 11 Documentation.zipWG 11 Documentation (17.0MB)
Sample Settlements Files and Reporting Spreadsheet.zipSample Settlements Files and Reporting Spreadsheet (624KB)
Revised SEMO Responses to FG2 ParticipantComments.xlsRevised SEMO Responses to Participant FG2 Comments (187KB)
Timeline Intraday Trading WG11.pdfTimeline Intraday Trading WG11 (35KB)
SEMO response to WG 11 Participant Feedback.xlsSEMO response to WG 11 Participant Feedback (51KB)
Mod_18_10_v2.docxModification Proposal V2 (8.0MB)
Legal Review Report.zipLegal Review Report (482KB)
SEMO Slides Conf Call 8.pptSEMO Slides Conf Call 8 (495KB)
TSO Slides Conf Call 8.pptTSO Slides Conf Call 8 (196KB)
Working Group 11 Report.zipWorking Group 11 Report (2.0MB)
Conf Call 8 Note.docxConf Call 8 Note (123KB)
Mod_18_10_v2-Slides_v3.pptSEMO Slides Meeting 39 (461KB)
FRR_18_10_V2.0.docxFRR (8.0MB)
SEM C Decision on Mod_18_10.pdfRA Decision (32KB)
 RA Decision: Approved (Not Vetoed) Active T&SC Section 2; T&SC Section 3; T&SC Section 4; T&SC Section 5; T&SC Section 6; T&SC Appendix D; T&SC Appendix E; T&SC Appendix H; T&SC Appendix I; T&SC Appendix J; T&SC Appendix K; T&SC Appendix N; T&SC Glossary; Agreed Procedure 1; Agreed Procedure 2; Agreed Procedure 4; Agreed Procedure 6; Agreed Procedure 9; Agreed Procedure 10; Agreed Procedure 11; Agreed Procedure 13; Agreed Procedure 17
  
MOD_17_10 Testing Tariff Update Clarification Implemented Closed T&SC Section 5
 27/05/2010
MOD_16_10 Removal of Section 6.91 Implemented Closed T&SC Section 6; Agreed Procedure 13
 02/06/2010
MOD_15_10 Further Extension of Interim Provisions for ESU Implemented Closed T&SC Section 4; T&SC Section 7
 05/05/2010
MOD_14_10 Excess Cash Collateral Drawdown Requirements Implemented Closed T&SC Section 3; Agreed Procedure 9
 21/05/2010
MOD_13_10 Ex Post LOLP Determination Clarification Implemented Closed T&SC Appendix M
 27/05/2010
MOD_12_10 Publication of the Code Implemented Closed T&SC Section 2; Agreed Procedure 12
 24/05/2010
MOD_11_10 Removal of Proposal Notice Term Implemented Closed T&SC Section 2
 24/05/2010
MOD_10_10 Nomination of Alternate Implemented Closed T&SC Section 2
 22/07/2010
MOD_09_10 AP12 Text Implemented Closed Agreed Procedure 12
 23/04/2010
MOD_08_10 Housekeeping 2 Implemented Closed T&SC Section 2; T&SC Appendix K; Agreed Procedure 17
 26/02/2010
MOD_07_10 Change to Settlement query process to increase period allowed to raise settlement query on M+13 statements Implemented Closed T&SC Section 6; Agreed Procedure 13
 18/02/2010
MOD_06_10 Change to Settlement query process to facilitate query of all settlement re-runs Implemented Closed T&SC Section 2; Agreed Procedure 13
 18/02/2010
MOD_05_10 Clarification of the Submission of SRAs by Account ID Implemented Closed Agreed Procedure 10
 05/02/2010
MOD_04_10 Addition of Fuel Type flag to Dispatch Instruction Data Transaction Withdrawn Closed T&SC Appendix K
  
MOD_03_10 Trading Site definition amendment Implemented Closed T&SC Glossary
 26/02/2010
MOD_02_10 Validation of Technical Data: Further Extension of Interim Validation Process Implemented Closed T&SC Section 7; T&SC Glossary
 26/02/2010
MOD_01_10 Alignment of Meter Data timelines for Autonomous Generator Units with timelines for other Generator Unit types RA Decision Rejected Closed T&SC Appendix L; Agreed Procedure 16
  
MOD_46_09 Treatment of UIs in Pumped Storage Units when Pumping Implemented Closed T&SC Section 5
 06/05/2011
MOD_45_09 Loss Adjustments in the Calculation of the Cost of Running in the Procedure to Calculate final Uplift Values RA Decision Rejected Closed T&SC Appendix N
  
MOD_44_09 Process for withdrawal of Modification Proposals Implemented Closed T&SC Section 2
 21/01/2010
MOD_43_09 Clarification on Invoice SRAs and Currency Costs Implemented Closed T&SC Section 1; Agreed Procedure 10
 22/01/2010
MOD_42_09 Removal of Reference to Administered Settlement in Force Majeure Paragraphs Implemented Closed T&SC Section 2
 12/01/2010
MOD_41_09 Aggregated Generator Unit Capacity Change Implemented Closed T&SC Section 5; Agreed Procedure 4
 21/01/2010
MOD_40_09 RA Modification Proposals Implemented Closed T&SC Section 2; T&SC Glossary
 21/01/2010
MOD_39_09 Housekeeping Implemented Closed   29/10/2009
MOD_38_09 Clarification of application of Resettlement Currency Costs Implemented Closed T&SC Section 6; T&SC Glossary; Agreed Procedure 15
 29/10/2009
MOD_37_09 Correction of Instruction Profiling rules for Pumped Storage Units Implemented Closed T&SC Appendix O
 12/01/2010
MOD_36_09 Extending interim provision for Error Supplier Unit calculation Implemented Closed T&SC Section 4; T&SC Section 7
  
MOD_35_09 Standing Offer Data RA Decision Rejected Closed T&SC Section 3; Agreed Procedure 4
  

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