Market Design

The Market Design is the set of processes and standards whereby the participants in the retail electricity market interact i.e. the 'rules of the road' for the retail market. The Industry Governance Group is the forum where the Market Design is discussed.

The most recent release for the retail market design coincided with SEM go-live on November 1st 2007. This is now the current baselined Market Design which is at 6.1.
Click here to view the Market Design @ version 6.1.

Version 6.1 baseline

Version 6.1 of the market design consists of the existing baseline plus the following MCRs.

• MCR 0070 - Changes required to MPD 5 to cater for Management of QH Eligibility
• MCR 0071 - Change of Metering from NQH to QH
• MCR 0079 - Proposed Solution to Actual CoLE reads being replaced by estimates where poor read history
• MCR 0083 - Provision of Eligible Customer List
• MCR 0085 - Section 10 Data Format & Character Set MPCC Technical Manual - in line with schema
• MCR 0131 - Update to MPD 16 (2.1) Data Aggregation v1.0
• MCR 0132 - Updates to Meter Point Registration Rejection Market Messages for alignment of Wholesale & Retail Market

Registration for Trading Sites
• MCR 0133 - Further updates to the Aggregation Briefing Document to satisfy new requirements of SEM implementation
• MCR 0134 - Changing the description of Reject Reason Code 'SSS'
• MCR 0135 - Updates to 595 Market Message
• MCR 0136 - Update to WP 0014 Distribution Connected Non Participant Generator Export Arrangements Working Practice
• MCR 0137 - Update to the Reading Data Status Definition
• MCR 0140 - Clarifications regarding the 591 MM
• MCR 0141 - Vulnerable Customers - Phase 1
• MCR 0143 - Update to xml schema to remove a pattern validation to the GUID field
• MCR 0144 - PL Lamp Types
• MCR 0145 - Update to validation rules within MPD 2 - QH CoS
• MCR 0146 - Update to validation rules within MPD 20 - Change of SSAC and/or Supplier Unit
• MCR 0147 - Vulnerable Customers - Phase 2
• MCR 0148 - Changes to the Aggregation Briefing Document, MPD 15 and MPD 16 (2.1) for RA324 Migration and PES Sites
• MCR 0149 - Estimation of QH values for Indicative Aggregation
• MCR 0150 - Inclusion of Seconds (SS) in the Date Timestamp format
• MCR 0151 - Clarification regarding date selection in WP12
• MCR 0153 - Additional Reject Reason Codes
• MCR 0155 - Corrections to ARIS Market Message Structures
• MCR 0156 - Amending Generator Unit ID and Generation Unit ID
• MCR 0158 - Enhancements to the guidance information in the ARIS Data Definitions
• DRR 0107 - Amendments to 305 and 300W messages in Retail Market Design in order to reflect the position in relation to live messages.

Also included are the following corrections to the previously published versions of the market design.

• Non Conformance 17 - Transposed model elements in wrong swimlane - MPD 5
• Non Conformance 35 - ARIS Model Error - Level 2 Business Flow does not link to MPD 16 2.1
• Non Conformance 48 - Model inconsistency with Generator/Generation Unit ID duplicate
• Non Conformance 50 - Missing Generation Unit ID Field on market messages 504 & 504S
• Non Conformance 153 - Market Message 300s is incorrectly associated with MPD 1 on the market message matrix
• Non Conformance 154 - The CoLE Process flow diagram was adjusted to more accurately represent the DUoS change process and return of connection agreement process within the Change of Legal Entity process.

Previous Version of the Market Design

Click here to view the Market Design @ version 6.0
Click here to view the Market Design @ version 5.1

Note: To use Aris Java 1.1 needs to be installed on your machine.

About the Market Design

The Market Design includes:

• Market Procedure Documents
• Market Messages
• Briefing Papers
• Working Practices
• Technical Guides for Messaging

All of this documentation is subject to formal change control.

The market design is part of a wider framework that includes documents that are agreed outside the Industry Governance Group. This framework includes:

• The Market Design
• Licences & Codes
• Agreements
• Service Levels

RMDS is responsible for the Maintenance, Publication and Circulation of information relevant to retail market design.

ARIS Process Modelling Tool
The Market Design Documentation is published on the Internet using a Process Modelling tool called ARIS. Benefits of Aris:

• Allows publication of documents to the internet showing links between processes and messages
• Ease of maintenance
• Usability