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.
Detection quality: Partial
Jurisdictions: au
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: 6
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, MIRN, meter installation, meter installation registration number, smart meter, interval data, demand response, AEMO, NEM, National Electricity Market, dispatch, substation, transmission, distribution network

Proximity: 300 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.