5MS and GS metering and metering data changes

The metering and metering data changes arising from the 5MS and GS rules will significantly impact metering coordinators (MCs), metering providers (MPs), metering data providers (MDPs) and distribution network service providers (DNSPs). This page outlines: the main 5MS and GS metering changes, where to find further information and who is responsible for implementing them. 

The information provided by AEMO on 5MS and GS is general and may not be appropriate for any participant’s particular situation or market activities. Please also refer to AEMO’s privacy and legal notices.

The main areas of change for NEM metering from the 5MS and GS rules and subsequent market procedure changes relate to:

  • 5MS metering installation and reconfiguration
  • 5MS metering data installation storage exemptions
  • 5MS and GS metering data delivery 
  • MSATS datastream standing data
  • MSATS standing data creation and maintenance

Metering service provider (MSP) accreditation updatesThe high-level changes for each area are described in the tables below. 

Key information on 5MS and GS metering and metering data changes

Key sources of detailed information on implementing metering and metering data changes are: 

  • 5MS/GS metering procedure updates: the necessary metering procedural changes that give effect to the 5MS and GS rule changes.
  • 5MS/GS metering technical specification updates: provides details of the changes to AEMO’s market-facing metering management systems and the information required for industry or vendors to make the consequent changes to their own systems.
  • Metering Transition Plan: outlines the expected responsibilities, activities, dependencies and timeframes for completion for elements of the metering transition to 5MS and GS.
  • MSP Accreditation update plan: sets out the timing and process for MSPs to apply for accreditation updates where necessary and as a result of 5MS and GS implementation activities. MSPs that require re-accreditation need to be appropriately re-accredited before they implement system and process changes for 5MS and GS.

5MS Metering installation and reconfiguration by MCs/MPs

Five-minute settlement relies on certain NEM meters recording and providing 5-minute metering data from 1 July 2021. The 5MS rule also introduced an obligation for new and replacement type 4 and type 4A meters to transition to providing 5-minute metering data by 1 December 2022 at the latest. These changes mean that meter providers, supported by metering coordinators, must install or reconfigure these meters in accordance with the 5MS rule.

The table below sets out the 5MS rule requirements for different meter types in the NEM. The requirements reflect the wording in the final 5MS rule and determination. It also shows the Metering Transition Plan (MTP) dates for completing these changes. The timeframes for undertaking MTP activities are earlier than the rule dates. This reflects that preparing for a smooth transition to 5MS and GS means that readiness activities need to be planned and executed by the formal commencement dates.

Metering type

Change

Rule Date

MTP Date

Types 1, 2 and 3 Must be capable of recording and providing, and configured to record and provide, five-minute trading interval energy data. By 1 Jul 2021  By 30 Apr 2021 
Subset of Type 4* Must be capable of recording and providing, and configured to record and provide, five-minute trading interval energy data.  By 1 Jul 2021 By 30 Apr 2021 
All metering installations other than type 4A All new and replacement metering installations (other than type 4A metering installations) must be capable of recording and providing five-minute data. 
From 1 Dec 2018 n/a (business as usual) 
Type 4A All new and replacement metering type 4A metering installations must be capable of recording and providing five-minute data. 
From 1 Dec 2019 n/a (business as usual) 
*Subset of type 4 meters definition from 5MS rule:

Type 4 metering installations at a:

  • Transmission network connection point; or 
  • Distribution network connection point where the relevant financially responsible Market Participant is a Market Generator or Small Generation Aggregator

5MS metering data installation storage exemptions

Under the 5MS rule, AEMO may grant an exemption where a type 1, 2, 3 or subset of type 4 meter is not quite capable of storing 35 days of metering data (i.e. 30-34 days) if it is reasonably satisfied that the Metering Provider will be able to otherwise satisfy the requirements of Chapter 7.

5MS and GS metering data delivery by MDPs

Five-minute settlement requires MDPs to deliver 5-minute data in accordance with the 5MS rule, as set out below. The GS rule and subsequent 5MS and GS implementation rule also require non-contestable unmetered load data to be calculated and provided to AEMO and participants. The table also shows the Metering Transition Plan (MTP) dates for completing these changes. The timeframes for undertaking MTP activities are earlier than the rule dates. This reflects that preparing for a smooth transition to 5MS and GS means that readiness activities need to be planned and executed by the formal commencement dates.

Metering or load type

Change

Rule Date

MTP Date

Types 1, 2 and 3 Must be capable of recording and providing, and configured to record and provide, five-minute trading interval energy data. By 1 Jul 2021  By 31 May 2021 
Subset of Type 4* Must be capable of recording and providing, and configured to record and provide, five-minute trading interval energy data.  By 1 Jul 2021 By 31 May 2021 
Type 7 Five-minute trading interval energy data must be calculated and provided.
By 1 Jul 2021 By 30 Jun 2021
All metering installations other than type 4A All new and replacement type 4 and type 5 metering installations installed from 1 December 2018 must record and provide five-minute data.
By 1 Dec 2022 For delivery pre 1 July: by 31 May 2021

For delivery after 1 July: prior to 1 Dec 2022
Type 4A All new and replacement type 4A metering installations installed from 1 December 2019 must record and provide five-minute data. By 1 Dec 2022 For delivery pre 1 July: by 31 May 2021

For delivery after 1 July: prior to 1 Dec 2022
Non-contestable unmetered load Five-minute trading interval energy data must be calculated and provided in accordance with AEMO’s metrology procedures.
By 1 Jul 2021 By 31 May 2021

In consultation with participants, AEMO made procedure changes relating to MDPs’ metering data delivery requirements that support 5MS and GS implementation. 

These requirements need to be completed by the 5MS commencement date (1 July 2021) to support 5MS and GS implementation from 5MS commencement.

Change

Key information

File format MDFF NEM12 files to be the required file format for all interval metering data being delivered to AEMO 

MDFF NEM13 files to be supported by AEMO. MDMF files for basic meter reads will continue to be supported and accepted by AEMO.
Granularity

NEM12 interval metering data to be:

  • Delivered at the register level (E, B, Q and K)
    • NEM12 200 records must be accurate
  • As per the meter’s trading interval configuration i.e. 5, 15 or 30-minute intervals
Energy

Metering data which must be sent to AEMO:

  • Import and Export Active energy (kWh) (E and B)
    Import and Export Reactive energy (kVarh) (Q and K), where applicable
  • Delivery of all other forms of metering data to AEMO (e.g. volts and amps) is not required but will be accepted if provided.

MSATS datastream standing data updates by MDPs

In consultation with participants, AEMO made procedure changes relating to standing data creation and maintenance requirements in MSATS to support 5MS and GS implementation. MDPs are responsible for implementing these changes. 

Metering type

Change

Procedure Date

MTP Date

Key Information

Types 1, 2, 3 and 7 and Non-contestable unmetered loads Net datastreams (N1) must be converted to Register level datastreams e.g. E1, B1, K1, Q1.

Datastreams associated with import and export reactive energy e.g. Q and K must be created in the CNDS table if they exist in the CRI table.  

Reactive datastreams must be established in a manner that ensures they are not included in market settlements.
By 1 July 2021 By 31 May 2021 
Subset of Type 4* Net datastreams (N1) must be converted to Register level datastreams e.g. E1, B1, K1, Q1.

Datastreams associated with import and export reactive energy e.g. Q and K must be created in the CNDS table if they exist in the CRI table.  

Reactive datastreams must be established in a manner that ensures they are not included in market settlements.
By 1 July 2021 By 31 May 2021
Types 4, 4A and 5

All new records relating to interval meters must be created at the register level e.g. E1, B1, K1, Q1.

Existing net datastream records can remain active post 1 July 2021, until an update to the datastream record is required e.g. meter replacement.  Where an update is required to a CNDS record, the net datastream record is to be inactivated and any new active datastreams records are to be created at the register level.

Datastreams associated with import and export reactive energy e.g. Q and K must be created in the CNDS table if they exist in the CRI table.  
Reactive datastreams must be established in a manner that ensures they are not included in market settlements.

From 1 July 2021 By 31 May 2021  
First tier basic measures meters

For UFE purposes, all 1st tier basic meter datastreams (local retailer datastreams) must be:

  1. Activated, and
  2. Meter reads delivered to AEMO
By July 2021
  1. By 31 March 2021
  2. From 1 April 2021
Update interval meter DataStream type codes Populate new DataStream Type Codes  By 6 Feb 2022 By 31 May 2021
Updated VIC TUOS DataStream type codes Update DataStream Type Codes  By 1 July 2021 By 31 May 2021 

*Subset of type 4 meters definition from 5MS rule:

Type 4 metering installations at a:

  • Transmission network connection point; or 
  • Distribution network connection point where the relevant financially responsible Market Participant is a Market Generator or Small Generation Aggregator.

MSATS NMI standing data creation and maintenance

The following activities must be completed to enable the appropriate calculation of ‘unaccounted for energy’ (UFE) required by the GS rule. Responsibility for MSATS standing data creation and maintenance varies depending on the change and is set out in the tables below. 

Change

Rule/Procedure Date

MTP Completion Date

Key information

Responsibility

All cross-boundary supplies have been created in MSATS  By 1 Jul 2021 By 31 May 2021  DNSP/MC
Non-contestable unmetered load (NCONUML) NMIs and associated standing data must be created in MSATS.  By 1 Jul 2021 By 31 May 2021 LNSP 
NMI Classification Code updates, for affected existing NMIs, must reflect the new code requirements (see next table)
 By 1 Jul 2021 By 31 May 2021  See next table
All Tier 1 basic meter datastreams are active By 1 Jul 2021  By 31 March 2021  MDP
Complete data cleanse to ensure that for Interval Meters, the RegisterID matches the content of the ‘Suffix’ within the CATS_REGISTER_IDENTIFIER table. E.g. ‘E1’, ‘B1’, ‘Q1’, ‘K1’, etc.
 By 1 Jul 2021 By 31 May 2021  MP

Descriptions of new NMI classification codes

New NMI classification code

Description

Responsibility

BULK Connection point where a transmission network connects to a distribution network - also termed 'Bulk Supply Point’
  • TNSP to update in MSATS
  • Participants to ensure capability to receive new code
DWHOLSAL Distribution network connection point where energy is directly purchased from the spot market by a Market Customer
  • LNSP to update in MSATS
  • Participants to ensure capability to receive new code
GLOPOOL Notional market participant ID to be introduced to effectively remove the applicable LR obligations and notifications in MSATS
  • AEMO to update LR and FRMP to GLOPOOL for existing NMIs as required
NCONUML  Non-contestable unmetered load
  • LNSP to update in MSATS
  • Participants to ensure capability to receive new code
NREG Connection point associated with a non-registered embedded generator, i.e. a generating unit that is not classified by a Market Generator but may be classified by a Small Generation Aggregator as a market generating unit.
  • LNSP to update in MSATS
  • Participants to ensure capability to receive new code
WHOLESAL Transmission network connection point where energy is directly purchased from the spot market by a Market Customer
  • TNSP to update in MSATS
  • Participants to ensure capability to receive new code
XBOUNDRY Connection point where a distribution network connects to another to distribution network
  • LNSP to update in MSATS
  • Participants to ensure capability to receive new code

MP and MDP accreditation updates

MPs and MDPs will likely need an update to their NEM accreditation where, as a result of the 5MS and/or GS rule changes, they have a change to their:

  • Processes
  • Systems, and/or
  • Personnel. 

The 5MS/GS Metering Service Provider (MSP) accreditation update plan sets out the process and timing for:

  • MSPs to assess the need for an accreditation update
  • MSPs to apply for an accreditation update where necessary
  • AEMO to process the accreditation update applications.
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