National Metering Identifier

Detects National Metering Identifier (NMI) patterns used in the Australian energy market. A 10 or 11 digit number identifying electricity and gas connection points. Context-dependent: requires energy/meter keywords.

Type: regex
Engine: universal
Confidence: low
Confidence justification: Low confidence: a bare 10-11 digit number matches phone numbers, ABNs, bank account numbers, and many other numeric sequences. Corroborative evidence keywords such as NMI, meter, energy, or AEMO are essential for reliable detection.
Jurisdictions: global
Regulations: AML/CTF Act (Cth), IPA 2009 (Qld), NDB Scheme (Cth), Privacy Act 1988 (Cth)
Frameworks: ISO 27001, ISO 27701
Data categories: infrastructure, energy
Scope: wide
Risk rating: 4
Platform compatibility: Purview: Compatible, GCP DLP: Compatible, Macie: Compatible, Zscaler: Compatible, Palo Alto: Compatible, Netskope: Compatible

Pattern

\b\d{10,11}\b

Corroborative evidence keywords

NMI, National Metering Identifier, meter, [object Object], MIRN, meter installation, meter installation registration number, smart meter, interval data, demand response, AEMO, [object Object], National Electricity Market, dispatch, substation, transmission, distribution network

Proximity: 500 characters

Should match

6102345678 — 10-digit NMI (minimum length)
61234567890 — 11-digit NMI (maximum length)
7001234567 — NMI starting with 7

Should not match

123456789 — Only 9 digits (below minimum of 10)
123456789012 — 12 digits (above maximum of 11)
12345ABCDE — Contains letters instead of all digits

Known false positives

Long numeric sequences in phone numbers, account numbers, ABNs, and other identifiers may match the generic 10-11 digit pattern without energy context. Mitigation: Require corroborative evidence keywords within the proximity window. Cross-reference with energy-specific terms to confirm actual NMI data.
In Australian English, standard business terminology overlapping with energy detection keywords in routine correspondence and documentation. Mitigation: Increase confidence threshold when scanning business correspondence. Layer with NMI-specific prefix patterns for higher precision.