MHHS Related Metering Points across Market Segments
Summary
It has been identified by the MHHS Data Cleanse Working Group (DCWG) that around 9,000 existing Metering Point Relationships include Metering Points that would migrate into different Market-wide Half Hourly Settlement (MHHS) Market Segments. The majority of these are where one Metering Point has a Traditional meter installed (Smart Segment) and a Related Metering Point has an Advanced meter (Advanced Segment). This situation is currently valid but in MHHS would cause two problems. - SMRS would not be able to align the agent appointments, leaving secondary MPANs without agents and MHHS Migrations unable to fully complete.
Latest update and next planned activity
Date of latest update
Latest Update
06/11/2025 - Following discussions at the Change Issues Group on 06 November, a REC guidance will be developed to support the resolution of this Issue after which it will be classed as resolved.
Impacts Overview
Impacted REC Parties and Market Participants
Data Services
Energy Supplier
Meter Operator Agent
Impacted REC Documents
Schedule 14 - Metering Operations
Schedule 28 - Related Metering Points
Other Industry Codes impacted
Balancing and Settlement Code (BSC)
Priority and rationale
Standard
Priority last updated on 29 May 2026
Solution development
Problem Statement
Without considering this Issue, there will be a risk to the MHHS migration. Indeed, a Metering Point installed which does not match its Related Metering Point (for example a Relationship between a Traditional meter with an Advanced Meter) will not be able to fully migrate to MHHS arrangements.
No documents available.
There is currently no Change Plan.
Original submission
Change details
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19 Aug 2025
Change details
MHHS Related Metering Points across Market Segments
It has been identified by the MHHS Data Cleanse Working Group (DCWG) that around 9,000 existing Metering Point Relationships include Metering Points that would migrate into different Market-wide Half Hourly Settlement (MHHS) Market Segments.
The majority of these are where one Metering Point has a Traditional meter installed (Smart Segment) and a Related Metering Point has an Advanced meter (Advanced Segment).
This situation is currently valid but in MHHS would cause two problems.
- SMRS would not be able to align the agent appointments, leaving secondary MPANs without agents and MHHS Migrations unable to fully complete.
- The REC MHHS drafting for Schedule 28 groups Related MPANs as Advanced or Smart, with no recognition of relationships crossing market segments.
The majority of these are where one Metering Point has a Traditional meter installed (Smart Segment) and a Related Metering Point has an Advanced meter (Advanced Segment).
This situation is currently valid but in MHHS would cause two problems.
- SMRS would not be able to align the agent appointments, leaving secondary MPANs without agents and MHHS Migrations unable to fully complete.
- The REC MHHS drafting for Schedule 28 groups Related MPANs as Advanced or Smart, with no recognition of relationships crossing market segments.
Without resolution this issue will potentially prevent some Metering Points migrating fully to MHHS arrangements, causing a risk to the MHHS migration.
A number of solutions are possible to resolve this issue:
- Maintaining the existing obligations which would mandate that Suppliers would need to ensure the Meter Points would migrate into the same Market Segment.
- Adding rules so that in the event of split Market Segments the Relationship would default to a particular Market Segment. (Similar to what happens where different meter types are present on the same Meter Point.)
- Amending the requirements so that split Market Segments are possible. The alignment of agent appointments to the Primary Meter Point would need reviewed if this option was taken forward.
There would be a further option to break the Relationship, however this would adversely impact Switching processes.
- Maintaining the existing obligations which would mandate that Suppliers would need to ensure the Meter Points would migrate into the same Market Segment.
- Adding rules so that in the event of split Market Segments the Relationship would default to a particular Market Segment. (Similar to what happens where different meter types are present on the same Meter Point.)
- Amending the requirements so that split Market Segments are possible. The alignment of agent appointments to the Primary Meter Point would need reviewed if this option was taken forward.
There would be a further option to break the Relationship, however this would adversely impact Switching processes.
This was discussed through the MHHS DCWG.
Impacts
No details provided
Other (please provide details in Additional information box below)
Resolution would resolve a potential issue that would prevent the migration of Meter Points to MHHS arrangements.
Schedule 14 - Metering Operations, Schedule 28 - Related Metering Points
The description of Related metering types is included in Schedule 28 while the MOA appointment process is covered in Schedule 14.
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Data Services, Energy Suppliers, Meter Operator Agent
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Balancing and Settlement Code (BSC)
Any change to the Agent alignment process for Related Metering Points would impact the BSC for Data Service Appointments and the SMRS processes in this area.
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No details provided
Priority & timing
No
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No details provided
Other (please provide details in the Additional information box below)
Activity
Status has been changed to Issue Review.