MHHS impacts to Data Transfer Network (DTN) Flows

Please note that as of 1 September 2025, the MHHS Programme Design mailbox, Design artefacts and the Design Issues Notification (DIN) log on the MHHS website are no longer monitored or updated. They are retained for historical reference only.

Following Milestone 8 (M8), the Target Operating Model (TOM) and MHHS Design were fully codified, and the Code Bodies no longer maintain standalone Programme artefacts. The live Code and Code Subsidiary Documents are now the single source of truth, and any changes made through Code governance will not appear in the historical documents.

You can view the latest artefacts online, directly from the respective Code Bodies websites, listed below:

Balancing & Settlement Code (BSC)

Retail Energy Code (REC)

Distribution Connection and Use of System Agreement (DCUSA)

For the latest information or to raise queries, please use the Elexon Support Portal or contact the respective Code Bodies directly.

Updated Data Transfer Network (DTN) Flow Solution Documents aligned with the MHHS Design 

In addition to DES196, the Programme maintains Design Artefact DEL1712 and associated Solution Documents for changes required to DTN flows for MHHS, which you can view in the respective libraries below.

The most recent changes to DTN flows were in Interim Release 8.11, for which you can view the Release Note below:

Interim Release 8.11 Release Note

If you have any questions about these documents, please email Design@mhhsprogramme.co.uk 

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BSC Solution Documents

Short Name Doc Number Sub Type Status Version
D0357 - Half Hourly Metered Data for EMR - IR8.7 D0357 BSC Solution Document Approved 1.0
D0295 - Rejection of BM Unit Allocation - IR8.7 D0295 BSC Solution Document Approved 1.0
D0401 - MHHS Aggregated Disconnected DUoS Report (REDLINED) D0401 BSC Solution Document Approved 1.3
D0294 - Confirmation of BM Unit Allocation - IR8.7 D0294 BSC Solution Document Approved 1.0
D0002 - Fault Resolution Report or Request for Decision on Further Action DEL1712 BSC Solution Document Approved 1.6
DEL1712 - MHHS Impacts to BSC owned Data Flows DEL1712 BSC Solution Document Approved 1.6
D0403 - MHHS GSP Group Demand Disconnection Totals Report (REDLINED) D0403 Unclassified Approved 1.2
D0404 - MHHS Supplier BM Unit Demand Disconnection Report D0404 BSC Solution Document Approved 1.2
D0001 - Request Metering System Investigation DEL1712 BSC Solution Document Approved 1.6
D0397 - MHHS Supplier Half Hourly Demand Report (REDLINED) D0397 BSC Solution Document Approved 1.3
D0403 - MHHS GSP Group Demand Disconnection Totals Report D0403 BSC Solution Document Approved 1.2
J0107 - Rejection Reason Code BSC Solution Document Approved 1.0
D0399 - MHHS GSP Group Consumption Totals Report D0399 BSC Solution Document Approved 1.3
D0398 - MHHS Supplier Settlement Header Report D0398 Unclassified Approved 1.3
D0397 - MHHS Supplier Half Hourly Demand Report D0397 BSC Solution Document Approved 1.3
D0297 - Notification of BM Unit Allocation - IR8.7 D0297 BSC Solution Document Approved 1.0
D0400 - MHHS Supplier BM Unit Report (REDLINED) D0400 BSC Solution Document Approved 1.4
D0398 - MHHS Supplier Settlement Header Report (REDLINED) D0398 Unclassified Approved 1.3
DEL1712 - MHHS Impacts to BSC owned Data Flows (REDLINED) DEL1712 BSC Solution Document Approved 1.6
D0399 - MHHS GSP Group Consumption Totals Report (REDLINED) D0399 BSC Solution Document Approved 1.3
D0400 - MHHS Supplier BM Unit Report D0400 BSC Solution Document Approved 1.4
D0401 - MHHS Aggregated Disconnected DUoS Report D0401 BSC Solution Document Approved 1.3
D0404 - MHHS Supplier BM Unit Demand Disconnection Report D0404 BSC Solution Document Approved 1.2
D0001 - Request Metering System Investigation (Redlined) DEL1712 BSC Solution Document Approved 1.6
D0387 - Metering System Half Hourly Volume Adjustments D0387 BSC Solution Document Approved v1.0
D0005 - Instruction on Action DEL1712 BSC Solution Document Approved 1.6
D0005 - Instruction on Action (Redlined) DEL1712 BSC Solution Document Approved 1.6
D-Flow and Interface Mapping DES196 Technical Design Draft 1.5
D0402 - MHHS Supplier Half Hourly Demand Disconnection Report D0402 BSC Solution Document Approved 1.2
D0402 - MHHS Supplier Half Hourly Demand Disconnection Report (REDLINED) D0402 BSC Solution Document Approved 1.2
D0002 - Fault Resolution Report or Request for Decision on Further Action (Redlined) DEL1712 BSC Solution Document Approved 1.6

REC Solution Documents

Short Name Doc Number Sub Type Status Version
D0225 - Priority Services Details D0225 REC Solution Document Approved 1.0
D0215 - Provision of Site Technical Details D0215 REC Solution Document Approved 1.0
D0382 - Rejection Response for Request to LDSO for Site Technical Details D0382 REC Solution Document Approved 1.0
D0193 - Confirmation of Key Meter Installation D0193 REC Solution Document Approved 1.0
J2256 - MOP Flow Response Code J2256 REC Solution Document Approved 1.0
D0190 - Issue Customer Key D0190 REC Solution Document Approved 1.0
D0149 - Notification of Mapping Details D0149 REC Solution Document Approved 1.1
D0191 - Request Special Visit to Read Reset Key Meter D0191 REC Solution Document Approved 1.0
D0224 - Notification of Programme for Re-Certification Meter Changes D0224 REC Solution Document Approved 1.0
D0169 - Allocation of New Additional MPAN Cores D0169 REC Solution Document Approved 1.0
D0139 Pre Transition Release D0139 REC Solution Document Approved v1.1
D0135 - Asset Condition Report D0135 REC Solution Document Approved 1.0
J0007 - Requested Action Code J0007 REC Solution Document Approved 1.0
D0268 - Advanced Meter Technical Details D0268 REC Solution Document Approved 1.0
D0221 - Notification of Failure to Install or Energise Metering System D0221 REC Solution Document Approved 1.0
D0311 Pre Transition Release D0311 REC Solution Document Approved V1.1
D0180 - Request to Energise De-Energise Shut Down Prepayment Meter D0180 REC Solution Document Approved 1.0
D0302 - Notification of Customer Details D0302 REC Solution Document Approved 1.0
D0126 - Pre Transition Release D0126 REC Solution Document Approved V1.1
Data Flow Changes Summary REC Solution Document Approved 1.0
D0150 Traditional Meter Technical Details D0150 REC Solution Document Approved 1.2
J2240 - Related MPAN Response Code v1.0 J2240 REC Solution Document Approved 1.0
Consequential Change - DTN Market Messages - R0241 v1.0 R0241 REC Solution Document Approved 1.0
D0239 - Revenue Protection Report on Action Taken D0239 REC Solution Document Approved 1.0
D0142 - Request for Installation or Change to a Metering System Functionality or Removal of All Meters D0142 REC Solution Document Approved 1.0
D0216 - Request Installation of Token Meter D0216 REC Solution Document Approved 1.0
D0176 - Request Tariff Debt Change on Token Meter D0176 REC Solution Document Approved 1.0
D0383 - Notification of Commissioning Information v1.1 D0383 REC Solution Document Approved 1.1
D0170 - Request for Metering System Related Details D0170 REC Solution Document Approved 1.0
D0202 - Readings and Settings from a Removed Smart Card Meter D0202 REC Solution Document Approved 1.0
D0304 - Notification of Meter Asset Provider D0304 REC Solution Document Approved 1.0
D0168 - Request for Additional New MPAN Cores D0168 REC Solution Document Approved 1.0
D0303 Pre Transition Release D0303 REC Solution Document Approved 1.2
D0384 - Notification of Commissioning Status v1.1 D0384 REC Solution Document Approved 1.1
D0178 - Confirmation of Token Meter Installation D0178 REC Solution Document Approved 1.0
D0134 - Request to Change Energisation Satus D0134 REC Solution Document Approved 1.0
J0171 - Reading Type J0171 REC Solution Document Approved 1.0
D0223 - Request to Install Check Meter or Carry Out Accuracy Tests D0223 REC Solution Document Approved 1.0
D0300 - Disputed Readings or Missing Readings on Change of Supplier v1.2 D0300 REC Solution Document Approved 1.2
Switch Meter Read Exceptions REC Solution Document Approved 1.0
J2255 - MPAS D0304 Response Code J2255 REC Solution Document Approved 1.0
D0136 - Report to Supplier of Possible Irregularity D0136 REC Solution Document Approved 1.0
D0192 - Readings and Settings from a Token or Key Meter D0192 REC Solution Document Approved 1.0
D0368 - Notification of Agreed or Cancelled Appointment with Customer D0368 REC Solution Document Approved 1.0
D0194 - Request for Installation of Key Meter D0194 REC Solution Document Approved 1.0
D0179 - Confirmation of Energisation De-Energisation of Prepayment Meter D0179 REC Solution Document Approved 1.0
D0222 - Change in Customer Details D0222 REC Solution Document Approved 1.0