BILLING_NMAS_TST_RECOVERY

BILLING_NMAS_TEST_RECOVERY sets out the recovery of NMAS testing payments This Table may also be used for NSCAS and Type 1 transitional services procured by AEMO under the ISF framework during 2025 and prior to the implementation of all system changes. During this time descriptions in these tables may not be correct.

Column Schema

BILLRUNNO

The current Billing RunNo for the week

SQL Type: NUMBER(3,0) Polars Type: pl.UInt16

This column is mandatory, and a primary key.

CONTRACTID

The NMAS Contract Id

SQL Type: VARCHAR(10) Polars Type: pl.Categorical

This column is mandatory, and a primary key.

CONTRACTYEAR

AEMO Contract Year number starting in week containing 1 January

SQL Type: NUMBER(4,0) Polars Type: pl.UInt16

This column is mandatory, and a primary key.

PARTICIPANTID

The Participant from whom the amount is recovered

For more information, see the dedicated documentation page.

SQL Type: VARCHAR(20) Polars Type: pl.Categorical

This column is mandatory, and a primary key.

REGIONID

The region from where the amount is recovered

For more information, see the dedicated documentation page.

The SQL type is VARCHAR(10). This is actually a factor/enum, with values:

• QLD1

• VIC1

• TAS1

• NSW1

• SA1

• SNOWY1

This column is mandatory, and a primary key.

SERVICE

The type of NSCAS service. Current value values are: - REACTIVE - LOADSHED - RESTART

SQL Type: VARCHAR(10) Polars Type: str

This column is mandatory, and a primary key.

WEEKNO

Week no within the contract year. Week no 1 is the week containing 1 January

Warning

There may be 53 weeks in a year, depending on how weeks align to the year start/end.

SQL Type: NUMBER(3,0) Polars Type: pl.UInt16

This column is mandatory, and a primary key.

ACE_PORTION

The Portion of ACE MWh Value used in the Recovery Calculation. . NULL for Billing Week prior to the IESS rule effective date

SQL Type: NUMBER(18,8) Polars Type: pl.Float64

This column is not mandatory.

ASOE_PORTION

The Portion of ASOE MWh Value used in the Recovery Calculation (100 - ACE_Portion). . NULL for Billing Week prior to the IESS rule effective date

SQL Type: NUMBER(18,8) Polars Type: pl.Float64

This column is not mandatory.

CUSTOMER_PROPORTION

The Customer Proportion for recovery amount in Percent

SQL Type: NUMBER(18,8) Polars Type: pl.Float64

This column is not mandatory.

GENERATOR_PROPORTION

The Generator Proportion for recovery amount in Percent (100-Customer Portion)

SQL Type: NUMBER(18,8) Polars Type: pl.Float64

This column is not mandatory.

LASTCHANGED

The Last Updated date and time

For more information, see the dedicated documentation page.

SQL Type: DATE Polars Type: pl.Datetime()

This column is not mandatory.

Example: 2026/01/20 00:05:00

NEM_ENERGY

The NEM energy in MWh for the recovery period

SQL Type: NUMBER(18,8) Polars Type: pl.Float64

This column is not mandatory.

NEM_GENERATION

The NEM Generation for the recovery period

SQL Type: NUMBER(18,8) Polars Type: pl.Float64

This column is not mandatory.

PARTICIPANT_ACE_MWH

The Participant ACE MWh Value used in the Recovery of the Testing Payment Amount if the service is recovered from ACE. NULL for Billing Week prior to the IESS rule effective date

SQL Type: NUMBER(18,8) Polars Type: pl.Float64

This column is not mandatory.

PARTICIPANT_ASOE_MWH

The Participant ASOE MWh Value used in the Recovery of the Testing Payment Amount if the service is recovered from ASOE. NULL for Billing Week prior to the IESS rule effective date

SQL Type: NUMBER(18,8) Polars Type: pl.Float64

This column is not mandatory.

PARTICIPANT_ENERGY

The Participant energy in MWh for the recovery period

SQL Type: NUMBER(18,8) Polars Type: pl.Float64

This column is not mandatory.

PARTICIPANT_GENERATION

The Participant Generation for the recovery period

SQL Type: NUMBER(18,8) Polars Type: pl.Float64

This column is not mandatory.

RBF

The Benefitting Factor for the RegionId

SQL Type: NUMBER(18,8) Polars Type: pl.Float64

This column is not mandatory.

RECOVERY_AMOUNT

The Total recovery amount for the billing week, being the sum of the customer and generator proportions for the PARTICIPANTID in REGIONID and sum of RecoveryAmount_ACE and RecoveryAmount_ASOE.

SQL Type: NUMBER(18,8) Polars Type: pl.Float64

This column is not mandatory.

RECOVERY_END_DATE

The Recovery End Date for the Testing Payment Calculation

Warning

Despite what the name suggests, this is a datetime, not a date.

SQL Type: DATE Polars Type: pl.Datetime()

This column is not mandatory.

Example: 2026/01/20 00:05:00

RECOVERY_START_DATE

The Recovery Start Date for the Testing Payment Calculation

Warning

Despite what the name suggests, this is a datetime, not a date.

SQL Type: DATE Polars Type: pl.Datetime()

This column is not mandatory.

Example: 2026/01/20 00:05:00

RECOVERYAMOUNT_ACE

The Participant Recovery Amount based on ACE MWh Value if the service is recovered from ACE . NULL for Billing Week prior to the IESS rule effective date

SQL Type: NUMBER(18,8) Polars Type: pl.Float64

This column is not mandatory.

RECOVERYAMOUNT_ASOE

The Participant Recovery Amount based on ASOE MWh Value if the service is recovered from ASOE . NULL for Billing Week prior to the IESS rule effective date

SQL Type: NUMBER(18,8) Polars Type: pl.Float64

This column is not mandatory.

REGION_ACE_MWH

The Region ACE MWh Value used in the Recovery of the Testing Payment Amount if the service is recovered from ACE. NULL for Billing Week prior to the IESS rule effective date

SQL Type: NUMBER(18,8) Polars Type: pl.Float64

This column is not mandatory.

REGION_ASOE_MWH

The Region ASOE MWh Value used in the Recovery of the Testing Payment Amount if the service is recovered from ASOE. NULL for Billing Week prior to the IESS rule effective date

SQL Type: NUMBER(18,8) Polars Type: pl.Float64

This column is not mandatory.

REGION_ENERGY

The RegionId energy in MWh for the recovery period

SQL Type: NUMBER(18,8) Polars Type: pl.Float64

This column is not mandatory.

TEST_PAYMENT

The total Testing Payment Amount to recover from all benefitting regions

SQL Type: NUMBER(18,8) Polars Type: pl.Float64

This column is not mandatory.

New Data Timing

Populated by the posting of a billing run, being several times each week

Code Examples

Polars

Casting is enums, categoricals etc is not essential, but may speed up parsing. Swapping int for pl.UInt16, pl.Int32 would also speed up parsing. However some of the datatypes are inferred, so they may be wrong.

This code deduplicates for you. Deduplication is normally only required across multiple months.

This code assumes that all columns are present, which may not be true for older files.

import polars as pl
import polars.selectors as cs

# e.g. "2029/03/15 00:05:00"
dt_s_fmt = "%Y/%m/%d %H:%M:%S"

csv_paths = ["SOMEFILE.CSV", "OTHERFILE.CSV"]

lf = (
    pl.concat(
        [
            pl.scan_csv(
                csv_path,  # must be unzipped beforehand
                skip_rows=1,  # skip the header
                infer_schema=False,  # much faster
            )
            .filter(cs.by_index(0) == "D")  # drop the footer
            .select(~cs.by_index(range(4)))  # drop metadata columns
            for csv_path in csv_paths
        ],
        how="diagonal_relaxed",
    )
    .with_columns(
        pl.col("LASTCHANGED", "RECOVERY_END_DATE", "RECOVERY_START_DATE").str.strptime(
            pl.Datetime, dt_s_fmt
        ),
    )
    .cast(
        {
            "BILLRUNNO": int,  # or pl.UInt16
            "CONTRACTID": pl.Categorical,
            "CONTRACTYEAR": int,  # or pl.UInt16
            "PARTICIPANTID": pl.Categorical,
            "REGIONID": pl.Enum(["QLD1", "VIC1", "TAS1", "NSW1", "SA1", "SNOWY1"]),
            "SERVICE": str,
            "WEEKNO": int,  # or pl.UInt16
            "ACE_PORTION": pl.Float64,
            "ASOE_PORTION": pl.Float64,
            "CUSTOMER_PROPORTION": pl.Float64,
            "GENERATOR_PROPORTION": pl.Float64,
            "NEM_ENERGY": pl.Float64,
            "NEM_GENERATION": pl.Float64,
            "PARTICIPANT_ACE_MWH": pl.Float64,
            "PARTICIPANT_ASOE_MWH": pl.Float64,
            "PARTICIPANT_ENERGY": pl.Float64,
            "PARTICIPANT_GENERATION": pl.Float64,
            "RBF": pl.Float64,
            "RECOVERY_AMOUNT": pl.Float64,
            "RECOVERYAMOUNT_ACE": pl.Float64,
            "RECOVERYAMOUNT_ASOE": pl.Float64,
            "REGION_ACE_MWH": pl.Float64,
            "REGION_ASOE_MWH": pl.Float64,
            "REGION_ENERGY": pl.Float64,
            "TEST_PAYMENT": pl.Float64,
        }
    )
    # Deduplicate
    # We want one row per ['BILLRUNNO', 'CONTRACTID', 'CONTRACTYEAR', 'PARTICIPANTID', 'REGIONID', 'SERVICE', 'WEEKNO']
    # Tie-breaker: greatest value of ['LASTCHANGED']
    .sort(["LASTCHANGED"], descending=False)
    .unique(
        subset=[
            "BILLRUNNO",
            "CONTRACTID",
            "CONTRACTYEAR",
            "PARTICIPANTID",
            "REGIONID",
            "SERVICE",
            "WEEKNO",
        ],
        keep="last",
    )
)

Nemosis

This table is not yet available in Nemosis.

Availability

Visibility: Private

This table is not available in the public monthly MMSDM archive. Is is only available to registered market participants over FTP inside a VPN.

Deduplication and PDR Loader Configuration

The primary keys are:

• BILLRUNNO

• CONTRACTID

• CONTRACTYEAR

• PARTICIPANTID

• REGIONID

• SERVICE

• WEEKNO

The transaction type is "insert", which means that you will usually not see duplicate data. If you do, you can deduplicate based on the primary keys, without sorting first. Rows from different files with the same primary keys should have the same values.

PDR Loader configuration is:

Report Name	Report Subtype	Version
BILLING	NMAS_TST_RECOVERY	2

This means that the CSV files start with metadata columns:

I,BILLING,NMAS_TST_RECOVERY,2,...
D,BILLING,NMAS_TST_RECOVERY,2,...

Indexes

• LASTCHANGED

Links

This page as JSON (schema documented here, but may change)

Download a JSON Schema specification for this table.

Official AEMO schema documentation

Other Information

Package: BILLING_RUN

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