As part of the MHHS Service Management process, participants may need to raise queries with the Supplier Meter Registration Service (SMRS). This would be for queries under the new MHHS arrangements from MHHS Milestone M11 & M12 (Migration Start, 22 October 2025) through to MHHS Milestone M15 (Migration completion, May 2027) and which include the sharing of MPAN or address information.

The Using SDEP to communicate with SMRS for MHHS Queries guidance document has been developed as an additional resource to help parties navigate these processes efficiently and securely.

If you have any further comments or questions, please contact Elexon Support.