The Market Rules consist of the latest approved Trading and Settlement Code, Agreed Procedures and any approved Modifications which have not yet been incorporated into the main body of the Code or the Agreed Procedures.

Codes and procedures

Click below to see full links to each part of the Trading and Settlement Code and Agreed Procedures. An Archive section contains links to Part A & Part C historic documents for reference as these have ceased to be effective since 2023. Part B came into effect in parallel with Part A since the launch of I-SEM, 2018 and since 2023 is the only enduring Trading and Settlement Code, as linked below; therefore the Part B references are no longer utilised. For any queries please email the Secretariat at balancingmodifications@sem-o.com.

Proposals in effect on the baseline

It is important to note that a Modification may become effective before the published draft of the Code is amended to include the Modification. Please see Modification Proposals currently in effect on the baseline below.

Mod IDTitleMod StatusStageSection AffectedEffective Date
Mod_06_24 RA Decision: Approved (Not Vetoed) Active Section H 01/10/2024
Mod_05_24 RA Decision: Approved (Not Vetoed) Active Section F 23/08/2024
Mod_04_24 RA Decision: Approved (Not Vetoed) Active Section B 23/08/2024