SET_NMAS_RECOVERY

SET_NMAS_RECOVERY sets out the NSCAS recovery data for payments other than testing 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

CONTRACTID

The NMAS/ISF Contract Id

SQL Type: VARCHAR2(20) Polars Type: pl.Categorical

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.

PAYMENTTYPE

The type of payment being recovered. Valid values are: - AVAILABILITY - ENABLEMENT - COMPENSATION

The SQL type is VARCHAR(20). This is actually a factor/enum, with values:

• AVAILABILITY

• ENABLEMENT

• COMPENSATION

This column is mandatory, and a primary key.

PERIODID

Settlements Trading Interval.

SQL Type: NUMBER(3,0) Polars Type: pl.Int16

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 incl ISF Services. Current value values are: - REACTIVE - LOADSHED - RESTART - INERTIA, SYSTEM STRENGTH, TYPE1, TYPE2

The SQL type is VARCHAR2(20). This is actually a factor/enum, with values:

• REACTIVE

• LOADSHED

• RESTART

• INERTIA

• SYSTEM STRENGTH

• TYPE1

• TYPE2

This column is mandatory, and a primary key.

SETTLEMENTDATE

Settlement Date

Warning

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

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

This column is mandatory, and a primary key.

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

VERSIONNO

Settlement run number

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

This column is mandatory, and a primary key.

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

PARTICIPANT_ACE_MWH

The ACE MWh value for the Participant used in the Recovery Amount Calculation. NULL Value for Settlement Dates 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 ASOE MWh value for the Participant used in the Recovery Amount Calculation. NULL Value for Settlement Dates 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 period. NULL Value for Settlement Dates post IESS rule effective date.

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

This column is not mandatory.

PARTICIPANT_GENERATION

Participant Generator Energy in the benefitting region. NULL Value for Settlement Dates post IESS rule effective date.

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

This column is not mandatory.

PAYMENT_AMOUNT

The total Payment Amount to recover from all benefitting regions

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 period for the PARTICIPANTID and REGIONID. For Settlement dates prior to the IESS rule effective date Sum of RECOVERY_AMOUNT_CUSTOMER + RECOVERY_AMOUNT_GENERATOR and Post IESS it is sum of RECOVERYAMOUNT_ACE + RECOVERYAMOUNT_ASOE.

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

This column is not mandatory.

RECOVERY_AMOUNT_CUSTOMER

The recovery amount allocated to customers. NULL Value for Settlement Dates post IESS rule effective date.

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

This column is not mandatory.

RECOVERY_AMOUNT_GENERATOR

The recovery amount allocated to generators. NULL Value for Settlement Dates post IESS rule effective date.

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

This column is not mandatory.

RECOVERYAMOUNT_ACE

The Recovery dollar amount for the Participant for the NMAS Contract Id calculated using the ACE MWh values for eligible services. NULL Value for Settlement Dates prior to the IESS rule effective date.

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

This column is not mandatory.

RECOVERYAMOUNT_ASOE

The Recovery dollar amount for the Participant for the NMAS Contract Id calculated using the ASOE_MWh values for eligible services. NULL Value for Settlement Dates 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 Regional ACE MWh value used in the Recovery Amount Calculation. NULL Value for Settlement Dates 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 Regional ASOE MWh value used in the Recovery Amount Calculation. NULL Value for Settlement Dates 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 period. NULL Value for Settlement Dates post IESS rule effective date.

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

This column is not mandatory.

REGION_GENERATION

The generator energy in the benefitting region. NULL Value for Settlement Dates post IESS rule effective date.

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

This column is not mandatory.

New Data Timing

Settlement Run

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("SETTLEMENTDATE", "LASTCHANGED").str.strptime(pl.Datetime, dt_s_fmt),
    )
    .cast(
        {
            "CONTRACTID": pl.Categorical,
            "PARTICIPANTID": pl.Categorical,
            "PAYMENTTYPE": pl.Enum(["AVAILABILITY", "ENABLEMENT", "COMPENSATION"]),
            "PERIODID": int,  # or pl.Int16
            "REGIONID": pl.Enum(["QLD1", "VIC1", "TAS1", "NSW1", "SA1", "SNOWY1"]),
            "SERVICE": pl.Enum(
                [
                    "REACTIVE",
                    "LOADSHED",
                    "RESTART",
                    "INERTIA",
                    "SYSTEM STRENGTH",
                    "TYPE1",
                    "TYPE2",
                ]
            ),
            "VERSIONNO": int,  # or pl.UInt16
            "PARTICIPANT_ACE_MWH": pl.Float64,
            "PARTICIPANT_ASOE_MWH": pl.Float64,
            "PARTICIPANT_ENERGY": pl.Float64,
            "PARTICIPANT_GENERATION": pl.Float64,
            "PAYMENT_AMOUNT": pl.Float64,
            "RBF": pl.Float64,
            "RECOVERY_AMOUNT": pl.Float64,
            "RECOVERY_AMOUNT_CUSTOMER": pl.Float64,
            "RECOVERY_AMOUNT_GENERATOR": pl.Float64,
            "RECOVERYAMOUNT_ACE": pl.Float64,
            "RECOVERYAMOUNT_ASOE": pl.Float64,
            "REGION_ACE_MWH": pl.Float64,
            "REGION_ASOE_MWH": pl.Float64,
            "REGION_ENERGY": pl.Float64,
            "REGION_GENERATION": pl.Float64,
        }
    )
    # Deduplicate
    # We want one row per ['CONTRACTID', 'PARTICIPANTID', 'PAYMENTTYPE', 'PERIODID', 'REGIONID', 'SERVICE', 'SETTLEMENTDATE', 'VERSIONNO']
    # Tie-breaker: greatest value of ['LASTCHANGED']
    .sort(["LASTCHANGED"], descending=False)
    .unique(
        subset=[
            "CONTRACTID",
            "PARTICIPANTID",
            "PAYMENTTYPE",
            "PERIODID",
            "REGIONID",
            "SERVICE",
            "SETTLEMENTDATE",
            "VERSIONNO",
        ],
        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:

• CONTRACTID

• PARTICIPANTID

• PAYMENTTYPE

• PERIODID

• REGIONID

• SERVICE

• SETTLEMENTDATE

• VERSIONNO

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
SETTLEMENTS	NMAS_RECOVERY	3

This means that the CSV files start with metadata columns:

I,SETTLEMENTS,NMAS_RECOVERY,3,...
D,SETTLEMENTS,NMAS_RECOVERY,3,...

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: SETTLEMENT_DATA

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