Changes to Supply Number Format for MHHS
Summary
The Electricity Supply License requires Suppliers to provide the Supply Number to each Consumer on every bill, or at least once per year where no bill has been sent. The Supply Number format is prescribed by the REC and is detailed in the Energy Market Data Specification. The MHHS design is changing the data associated with each individual metering point, including those data items currently displayed within the Supply Number top line. To support Electricity Supplier implementation of the MHHS arrangements, a clearly defined solution is required setting out a revised approach to populating the Supply Number on Consumer’s bills and statements.
Latest update and next planned activity
Date of latest update
Latest Update
22/09/25 - This Change Proposal has been implemented as part of the MHHS M8 22 September 2025 REC Release.
Impacts Overview
Priority and rationale
High
Priority last updated on 29 May 2026
Solution development
Problem Statement
The Market-wide Half Hourly Settlement design is impacting the Data Items that are used in the top line of the Supply Number, which Energy Suppliers are obliged to provide to Consumers at least once a year under their Licence. A revised definition of the Supply Number format is required so that Electricity Suppliers have a clear understanding of the approach to populating the Supply Number for metering points that have migrated to the new MHHS arrangements.
Proposed solution summary
- As an electricity Consumer I want to be able to provide my prospective Energy Supplier with the necessary information for them to provide a suitable tariff. As a Non-Domestic Consumer, I want to have the necessary information that will allow me to access tariff information, specific to my business, to help me manage my energy. As an electricity Consumer, I want to have access to the data that will help me appoint my own Metering Equipment Manager (MEM) where permitted.
- As a Supplier, I want to know how to populate and format the Supply Number, so that I can meet my obligations to include it in Consumer bills or statements. As a Third Party Intermediary (TPI), I want Consumers to be able to provide me with the right information to provide appropriate quotes.
- As an independent Distribution Network Operator, I want to be able to identify and use the DUoS Tariff Id so that I can provide transparency on charging that is being applied to my customers. As the Electricity Enquiry Service (EES) Provider, I want to know how to populate the Supply Number so that I can make it available on the EES
No documents available.
Change Plan
Solution development completed
Completed
Start:
05 Dec 2022Due:
31 Mar 2023Completion:
31 Mar 2023Party Impact Assessment issued
Completed
Start:
31 Mar 2023Due:
06 Apr 2023Completion:
06 Apr 2023Party Impact Assessment closed
Completed
Start:
06 Apr 2023Due:
02 May 2023Completion:
02 May 2023Preliminary Change Report issued
Completed
Start:
02 May 2023Due:
25 May 2023Completion:
26 May 2023REC Change Panel review of PCR
Completed
Start:
25 May 2023Due:
06 Jun 2023Completion:
06 Jun 2023Consultation issued
Completed
Start:
06 Jun 2023Due:
09 Jun 2023Completion:
09 Jun 2023Consultation closed
Completed
Start:
09 Jun 2023Due:
30 Jun 2023Completion:
30 Jun 2023Final Change Report issued
Completed
Start:
30 Jun 2023Due:
21 Jul 2023Completion:
20 Jul 2023REC Change Panel decision
Completed
Start:
21 Jul 2023Due:
01 Aug 2023Completion:
01 Aug 2023Authority Determination requested
Completed
Start:
01 Aug 2023Due:
03 Aug 2023Completion:
02 Aug 2023Original submission
Change details
- - -
5 Dec 2022
Change details
Changes to Supply Number Format for MHHS
-
-
-
-
Impacts
No details provided
No details provided
-
No details provided
-
No details provided
-
No details provided
-
No details provided
-
No details provided
-
No details provided
-
No details provided
-
No details provided
-
-
No details provided
Priority & timing
No
-
-
-
No details provided
-
Activity
Proposed solution summary changed to As an electricity Consumer I want to be able to provide my prospective Energy Supplier with the necessary information for them to provide a suitable tariff. As a Non-Domestic Consumer, I want to have the necessar…
Proposed solution summary changed to As an electricity Consumer I want to be able to provide my prospective Energy Supplier with the necessary information for them to provide a suitable tariff. As a Non-Domestic Consumer, I want to have the necessary information that will allow me to access tariff information, specific to my business, to help me manage my energy. As an electricity Consumer, I want to have access to the data that will help me appoint my own Metering Equipment Manager (MEM) where permitted.As a Supplier, I want to know how to populate and format the Supply Number, so that I can meet my obligations to include it in Consumer bills or statements. As a Third Party Intermediary (TPI), I want Consumers to be able to provide me with the right information to provide appropriate quotes.As an independent Distribution Network Operator, I want to be able to identify and use the DUoS Tariff Id so that I can provide transparency on charging that is being applied to my customers. As the Electricity Enquiry Service (EES) Provider, I want to know how to populate the Supply Number so that I can make it available on the EES.
Show moreImplementation Date has been updated to MHHS Programme Milestone M8 (Code changes delivered).
harriet.truss has been allocated as Lead Analyst.
Orphaned SME: Lead Technical Analyst has been allocated as SME.