22-Digit MPAN
MeteringThe MHHS-era electricity supply number format, where the legacy 3-digit Meter Timeswitch Code becomes the 4-digit Standard Settlement Configuration, taking the full MPAN from 21 to 22 digits.
Under Market-wide Half-Hourly Settlement, the electricity supply number (MPAN) moves from 21 digits to 22 digits. The change was introduced at MHHS go-live on 22 September 2025 under REC Change Proposal R0083.
What actually changed: The extra digit comes from one field. The legacy 3-digit Meter Timeswitch Code (MTC) is replaced by the 4-digit Standard Settlement Configuration (SSC). The other fields keep their position and length; the 3-character LLFC keeps its value but is renamed the DUoS Tariff ID.
| Field | Legacy (21-digit) | MHHS (22-digit) |
|---|---|---|
| Configuration | MTC (3 digits) | SSC (4 digits) |
| Profile Class | 2 digits | 2 digits |
| LLFC | 3 characters | 3 characters (now also called DUoS Tariff ID) |
| Distributor ID | 2 digits | 2 digits |
| MPAN Core | last 13 digits | last 13 digits (unchanged) |
Important: the MPAN Core (the last 13 digits used across most industry systems) and its check digit are not affected. Only the top-line configuration field grows.
Why it matters for systems: During the transition, both formats are live at the same time. Any system that validates or parses MPANs needs to accept 21 and 22-digit supply numbers, and recognise that a migrated meter shows Profile Class 00 with a 4-digit SSC.
Example
Legacy: 03 845 100 10 12345678 901 (21 digits) becomes MHHS: 00 0393 100 10 12345678 901 (22 digits)Related terms
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